1449 lines
60 KiB
Systemverilog
1449 lines
60 KiB
Systemverilog
// SPDX-License-Identifier: Apache-2.0
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// Copyright 2020 Western Digital Corporation or its affiliates.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//********************************************************************************
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// $Id$
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//
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//
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// Owner:
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// Function: lsu interface with interface queue
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// Comments:
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//
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//********************************************************************************
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module el2_lsu_bus_buffer
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import el2_pkg::*;
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#(
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`include "el2_param.vh"
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) (
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input logic clk, // Clock only while core active. Through one clock header. For flops with second clock header built in. Connected to ACTIVE_L2CLK.
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input logic clk_override, // Override non-functional clock gating
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input logic rst_l, // reset, active low
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input logic scan_mode, // scan mode
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input logic dec_tlu_external_ldfwd_disable, // disable load to load forwarding for externals
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input logic dec_tlu_wb_coalescing_disable, // disable write buffer coalescing
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input logic dec_tlu_sideeffect_posted_disable, // Don't block the sideeffect load store to the bus
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input logic dec_tlu_force_halt,
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// various clocks needed for the bus reads and writes
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input logic lsu_bus_obuf_c1_clken,
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input logic lsu_busm_clken,
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input logic lsu_c2_r_clk,
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input logic lsu_bus_ibuf_c1_clk,
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input logic lsu_bus_obuf_c1_clk,
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input logic lsu_bus_buf_c1_clk,
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input logic lsu_free_c2_clk,
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input logic lsu_busm_clk,
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input logic dec_lsu_valid_raw_d, // Raw valid for address computation
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input el2_lsu_pkt_t lsu_pkt_m, // lsu packet flowing down the pipe
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input el2_lsu_pkt_t lsu_pkt_r, // lsu packet flowing down the pipe
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input logic [31:0] lsu_addr_m, // lsu address flowing down the pipe
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input logic [31:0] end_addr_m, // lsu address flowing down the pipe
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input logic [31:0] lsu_addr_r, // lsu address flowing down the pipe
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input logic [31:0] end_addr_r, // lsu address flowing down the pipe
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input logic [31:0] store_data_r, // store data flowing down the pipe
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input logic no_word_merge_r, // r store doesn't need to wait in ibuf since it will not coalesce
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input logic no_dword_merge_r, // r store doesn't need to wait in ibuf since it will not coalesce
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input logic lsu_busreq_m, // bus request is in m
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output logic lsu_busreq_r, // bus request is in r
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input logic ld_full_hit_m, // load can get all its byte from a write buffer entry
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input logic flush_m_up, // flush
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input logic flush_r, // flush
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input logic lsu_commit_r, // lsu instruction in r commits
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input logic is_sideeffects_r, // lsu attribute is side_effects
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input logic ldst_dual_d, // load/store is unaligned at 32 bit boundary
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input logic ldst_dual_m, // load/store is unaligned at 32 bit boundary
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input logic ldst_dual_r, // load/store is unaligned at 32 bit boundary
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input logic [7:0] ldst_byteen_ext_m, // HI and LO signals
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output logic lsu_bus_buffer_pend_any, // bus buffer has a pending bus entry
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output logic lsu_bus_buffer_full_any, // bus buffer is full
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output logic lsu_bus_buffer_empty_any, // bus buffer is empty
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output logic [ 3:0] ld_byte_hit_buf_lo,
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ld_byte_hit_buf_hi, // Byte enables for forwarding data
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output logic [31:0] ld_fwddata_buf_lo,
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ld_fwddata_buf_hi, // load forwarding data
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output logic lsu_imprecise_error_load_any, // imprecise load bus error
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output logic lsu_imprecise_error_store_any, // imprecise store bus error
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output logic [31:0] lsu_imprecise_error_addr_any, // address of the imprecise error
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// Non-blocking loads
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output logic lsu_nonblock_load_valid_m, // there is an external load -> put in the cam
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output logic [pt.LSU_NUM_NBLOAD_WIDTH-1:0] lsu_nonblock_load_tag_m, // the tag of the external non block load
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output logic lsu_nonblock_load_inv_r, // invalidate signal for the cam entry for non block loads
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output logic [pt.LSU_NUM_NBLOAD_WIDTH-1:0] lsu_nonblock_load_inv_tag_r, // tag of the enrty which needs to be invalidated
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output logic lsu_nonblock_load_data_valid, // the non block is valid - sending information back to the cam
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output logic lsu_nonblock_load_data_error, // non block load has an error
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output logic [pt.LSU_NUM_NBLOAD_WIDTH-1:0] lsu_nonblock_load_data_tag, // the tag of the non block load sending the data/error
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output logic [31:0] lsu_nonblock_load_data, // Data of the non block load
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// PMU events
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output logic lsu_pmu_bus_trxn,
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output logic lsu_pmu_bus_misaligned,
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output logic lsu_pmu_bus_error,
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output logic lsu_pmu_bus_busy,
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// AXI Write Channels
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output logic lsu_axi_awvalid,
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input logic lsu_axi_awready,
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output logic [pt.LSU_BUS_TAG-1:0] lsu_axi_awid,
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output logic [ 31:0] lsu_axi_awaddr,
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output logic [ 3:0] lsu_axi_awregion,
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output logic [ 7:0] lsu_axi_awlen,
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output logic [ 2:0] lsu_axi_awsize,
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output logic [ 1:0] lsu_axi_awburst,
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output logic lsu_axi_awlock,
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output logic [ 3:0] lsu_axi_awcache,
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output logic [ 2:0] lsu_axi_awprot,
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output logic [ 3:0] lsu_axi_awqos,
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output logic lsu_axi_wvalid,
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input logic lsu_axi_wready,
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output logic [63:0] lsu_axi_wdata,
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output logic [ 7:0] lsu_axi_wstrb,
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output logic lsu_axi_wlast,
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input logic lsu_axi_bvalid,
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output logic lsu_axi_bready,
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input logic [ 1:0] lsu_axi_bresp,
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input logic [pt.LSU_BUS_TAG-1:0] lsu_axi_bid,
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// AXI Read Channels
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output logic lsu_axi_arvalid,
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input logic lsu_axi_arready,
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output logic [pt.LSU_BUS_TAG-1:0] lsu_axi_arid,
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output logic [ 31:0] lsu_axi_araddr,
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output logic [ 3:0] lsu_axi_arregion,
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output logic [ 7:0] lsu_axi_arlen,
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output logic [ 2:0] lsu_axi_arsize,
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output logic [ 1:0] lsu_axi_arburst,
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output logic lsu_axi_arlock,
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output logic [ 3:0] lsu_axi_arcache,
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output logic [ 2:0] lsu_axi_arprot,
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output logic [ 3:0] lsu_axi_arqos,
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input logic lsu_axi_rvalid,
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output logic lsu_axi_rready,
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input logic [pt.LSU_BUS_TAG-1:0] lsu_axi_rid,
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input logic [ 63:0] lsu_axi_rdata,
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input logic [ 1:0] lsu_axi_rresp,
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input logic lsu_bus_clk_en,
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input logic lsu_bus_clk_en_q
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);
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// For Ld: IDLE -> WAIT -> CMD -> RESP -> DONE_PARTIAL(?) -> DONE_WAIT(?) -> DONE -> IDLE
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// For St: IDLE -> WAIT -> CMD -> RESP(?) -> IDLE
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typedef enum logic [2:0] {
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IDLE = 3'b000,
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WAIT = 3'b001,
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CMD = 3'b010,
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RESP = 3'b011,
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DONE_PARTIAL = 3'b100,
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DONE_WAIT = 3'b101,
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DONE = 3'b110
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} state_t;
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localparam DEPTH = pt.LSU_NUM_NBLOAD;
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localparam DEPTH_LOG2 = pt.LSU_NUM_NBLOAD_WIDTH;
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localparam TIMER = 8; // This can be only power of 2
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localparam TIMER_MAX = TIMER - 1; // Maximum value of timer
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localparam TIMER_LOG2 = (TIMER < 2) ? 1 : $clog2(TIMER);
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logic [3:0] ldst_byteen_hi_m, ldst_byteen_lo_m;
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logic [DEPTH-1:0] ld_addr_hitvec_lo, ld_addr_hitvec_hi;
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logic [3:0][DEPTH-1:0] ld_byte_hitvec_lo, ld_byte_hitvec_hi;
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logic [3:0][DEPTH-1:0] ld_byte_hitvecfn_lo, ld_byte_hitvecfn_hi;
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logic ld_addr_ibuf_hit_lo, ld_addr_ibuf_hit_hi;
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logic [3:0] ld_byte_ibuf_hit_lo, ld_byte_ibuf_hit_hi;
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logic [3:0] ldst_byteen_r;
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logic [3:0] ldst_byteen_hi_r, ldst_byteen_lo_r;
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logic [31:0] store_data_hi_r, store_data_lo_r;
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logic is_aligned_r; // Aligned load/store
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logic ldst_samedw_r;
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logic lsu_nonblock_load_valid_r;
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logic [31:0] lsu_nonblock_load_data_hi, lsu_nonblock_load_data_lo, lsu_nonblock_data_unalgn;
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logic [1:0] lsu_nonblock_addr_offset;
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logic [1:0] lsu_nonblock_sz;
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logic lsu_nonblock_unsign;
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logic lsu_nonblock_load_data_ready;
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logic [DEPTH-1:0] CmdPtr0Dec, CmdPtr1Dec;
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logic [DEPTH-1:0] RspPtrDec;
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logic [DEPTH_LOG2-1:0] CmdPtr0, CmdPtr1;
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logic [DEPTH_LOG2-1:0] RspPtr;
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logic [DEPTH_LOG2-1:0] WrPtr0_m, WrPtr0_r;
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logic [DEPTH_LOG2-1:0] WrPtr1_m, WrPtr1_r;
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logic found_wrptr0, found_wrptr1, found_cmdptr0, found_cmdptr1;
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logic [3:0] buf_numvld_any, buf_numvld_wrcmd_any, buf_numvld_cmd_any, buf_numvld_pend_any;
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logic any_done_wait_state;
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logic bus_sideeffect_pend;
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logic bus_coalescing_disable;
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logic bus_addr_match_pending;
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logic bus_cmd_sent, bus_cmd_ready;
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logic bus_wcmd_sent, bus_wdata_sent;
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logic bus_rsp_read, bus_rsp_write;
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logic [pt.LSU_BUS_TAG-1:0] bus_rsp_read_tag, bus_rsp_write_tag;
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logic bus_rsp_read_error, bus_rsp_write_error;
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logic [ 63:0] bus_rsp_rdata;
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// Bus buffer signals
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state_t [ DEPTH-1:0 ] buf_state;
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logic [DEPTH-1:0] [ 1:0] buf_sz;
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logic [DEPTH-1:0] [ 31:0] buf_addr;
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logic [DEPTH-1:0] [ 3:0] buf_byteen;
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logic [DEPTH-1:0] buf_sideeffect;
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logic [DEPTH-1:0] buf_write;
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logic [DEPTH-1:0] buf_unsign;
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logic [DEPTH-1:0] buf_dual;
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logic [DEPTH-1:0] buf_samedw;
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logic [DEPTH-1:0] buf_nomerge;
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logic [DEPTH-1:0] buf_dualhi;
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logic [DEPTH-1:0] [DEPTH_LOG2-1:0] buf_dualtag;
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logic [DEPTH-1:0] buf_ldfwd;
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logic [DEPTH-1:0] [DEPTH_LOG2-1:0] buf_ldfwdtag;
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logic [DEPTH-1:0] buf_error;
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logic [DEPTH-1:0] [ 31:0] buf_data;
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logic [DEPTH-1:0][DEPTH-1:0] buf_age, buf_age_younger;
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logic [DEPTH-1:0][DEPTH-1:0] buf_rspage, buf_rsp_pickage;
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state_t [ DEPTH-1:0 ] buf_nxtstate;
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logic [ DEPTH-1:0] buf_rst;
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logic [ DEPTH-1:0] buf_state_en;
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logic [ DEPTH-1:0] buf_cmd_state_bus_en;
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logic [ DEPTH-1:0] buf_resp_state_bus_en;
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logic [ DEPTH-1:0] buf_state_bus_en;
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logic [ DEPTH-1:0] buf_dual_in;
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logic [ DEPTH-1:0] buf_samedw_in;
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logic [ DEPTH-1:0] buf_nomerge_in;
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logic [ DEPTH-1:0] buf_sideeffect_in;
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logic [ DEPTH-1:0] buf_unsign_in;
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logic [ DEPTH-1:0] [ 1:0] buf_sz_in;
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logic [ DEPTH-1:0] buf_write_in;
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logic [ DEPTH-1:0] buf_wr_en;
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logic [ DEPTH-1:0] buf_dualhi_in;
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logic [ DEPTH-1:0] [DEPTH_LOG2-1:0] buf_dualtag_in;
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logic [ DEPTH-1:0] buf_ldfwd_en;
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logic [ DEPTH-1:0] buf_ldfwd_in;
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logic [ DEPTH-1:0] [DEPTH_LOG2-1:0] buf_ldfwdtag_in;
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logic [ DEPTH-1:0] [ 3:0] buf_byteen_in;
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logic [ DEPTH-1:0] [ 31:0] buf_addr_in;
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logic [ DEPTH-1:0] [ 31:0] buf_data_in;
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logic [ DEPTH-1:0] buf_error_en;
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logic [ DEPTH-1:0] buf_data_en;
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logic [ DEPTH-1:0] [ DEPTH-1:0] buf_age_in;
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logic [ DEPTH-1:0] [ DEPTH-1:0] buf_ageQ;
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logic [ DEPTH-1:0] [ DEPTH-1:0] buf_rspage_set;
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logic [ DEPTH-1:0] [ DEPTH-1:0] buf_rspage_in;
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logic [ DEPTH-1:0] [ DEPTH-1:0] buf_rspageQ;
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// Input buffer signals
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logic ibuf_valid;
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logic ibuf_dual;
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logic ibuf_samedw;
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logic ibuf_nomerge;
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logic [DEPTH_LOG2-1:0] ibuf_tag;
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logic [DEPTH_LOG2-1:0] ibuf_dualtag;
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logic ibuf_sideeffect;
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logic ibuf_unsign;
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logic ibuf_write;
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logic [ 1:0] ibuf_sz;
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logic [ 3:0] ibuf_byteen;
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logic [ 31:0] ibuf_addr;
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logic [ 31:0] ibuf_data;
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logic [TIMER_LOG2-1:0] ibuf_timer;
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logic ibuf_byp;
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logic ibuf_wr_en;
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logic ibuf_rst;
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logic ibuf_force_drain;
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logic ibuf_drain_vld;
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logic [ DEPTH-1:0] ibuf_drainvec_vld;
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logic [DEPTH_LOG2-1:0] ibuf_tag_in;
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logic [DEPTH_LOG2-1:0] ibuf_dualtag_in;
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logic [ 1:0] ibuf_sz_in;
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logic [ 31:0] ibuf_addr_in;
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logic [ 3:0] ibuf_byteen_in;
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logic [ 31:0] ibuf_data_in;
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logic [TIMER_LOG2-1:0] ibuf_timer_in;
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logic [ 3:0] ibuf_byteen_out;
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logic [ 31:0] ibuf_data_out;
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logic ibuf_merge_en, ibuf_merge_in;
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// Output buffer signals
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logic obuf_valid;
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logic obuf_write;
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logic obuf_nosend;
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logic obuf_rdrsp_pend;
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logic obuf_sideeffect;
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logic [31:0] obuf_addr;
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logic [63:0] obuf_data;
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logic [ 1:0] obuf_sz;
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logic [ 7:0] obuf_byteen;
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logic obuf_merge;
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logic obuf_cmd_done, obuf_data_done;
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logic [pt.LSU_BUS_TAG-1:0] obuf_tag0;
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logic [pt.LSU_BUS_TAG-1:0] obuf_tag1;
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logic [pt.LSU_BUS_TAG-1:0] obuf_rdrsp_tag;
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logic ibuf_buf_byp;
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logic obuf_force_wr_en;
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logic obuf_wr_wait;
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logic obuf_wr_en, obuf_wr_enQ;
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logic obuf_rst;
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logic obuf_write_in;
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logic obuf_nosend_in;
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logic obuf_rdrsp_pend_en;
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logic obuf_rdrsp_pend_in;
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logic obuf_sideeffect_in;
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logic obuf_aligned_in;
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logic [31:0] obuf_addr_in;
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logic [63:0] obuf_data_in;
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logic [ 1:0] obuf_sz_in;
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logic [ 7:0] obuf_byteen_in;
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logic obuf_merge_in;
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logic obuf_cmd_done_in, obuf_data_done_in;
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logic [pt.LSU_BUS_TAG-1:0] obuf_tag0_in;
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logic [pt.LSU_BUS_TAG-1:0] obuf_tag1_in;
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logic [pt.LSU_BUS_TAG-1:0] obuf_rdrsp_tag_in;
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logic obuf_merge_en;
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logic [TIMER_LOG2-1:0] obuf_wr_timer, obuf_wr_timer_in;
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logic [7:0] obuf_byteen0_in, obuf_byteen1_in;
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logic [63:0] obuf_data0_in, obuf_data1_in;
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logic lsu_axi_awvalid_q, lsu_axi_awready_q;
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logic lsu_axi_wvalid_q, lsu_axi_wready_q;
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logic lsu_axi_arvalid_q, lsu_axi_arready_q;
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logic lsu_axi_bvalid_q, lsu_axi_bready_q;
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logic lsu_axi_rvalid_q, lsu_axi_rready_q;
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logic [pt.LSU_BUS_TAG-1:0] lsu_axi_bid_q, lsu_axi_rid_q;
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logic [1:0] lsu_axi_bresp_q, lsu_axi_rresp_q;
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logic [pt.LSU_BUS_TAG-1:0] lsu_imprecise_error_store_tag;
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logic [ 63:0] lsu_axi_rdata_q;
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//------------------------------------------------------------------------------
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// Load forwarding logic start
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//------------------------------------------------------------------------------
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// Function to do 8 to 3 bit encoding
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function automatic logic [2:0] f_Enc8to3;
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input logic [7:0] Dec_value;
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logic [2:0] Enc_value;
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Enc_value[0] = Dec_value[1] | Dec_value[3] | Dec_value[5] | Dec_value[7];
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Enc_value[1] = Dec_value[2] | Dec_value[3] | Dec_value[6] | Dec_value[7];
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Enc_value[2] = Dec_value[4] | Dec_value[5] | Dec_value[6] | Dec_value[7];
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return Enc_value[2:0];
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endfunction // f_Enc8to3
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// Buffer hit logic for bus load forwarding
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assign ldst_byteen_hi_m[3:0] = ldst_byteen_ext_m[7:4];
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assign ldst_byteen_lo_m[3:0] = ldst_byteen_ext_m[3:0];
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for (genvar i = 0; i < DEPTH; i++) begin
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assign ld_addr_hitvec_lo[i] = (lsu_addr_m[31:2] == buf_addr[i][31:2]) & buf_write[i] & (buf_state[i] != IDLE) & lsu_busreq_m;
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assign ld_addr_hitvec_hi[i] = (end_addr_m[31:2] == buf_addr[i][31:2]) & buf_write[i] & (buf_state[i] != IDLE) & lsu_busreq_m;
|
|
end
|
|
|
|
for (genvar j = 0; j < 4; j++) begin
|
|
assign ld_byte_hit_buf_lo[j] = |(ld_byte_hitvecfn_lo[j]) | ld_byte_ibuf_hit_lo[j];
|
|
assign ld_byte_hit_buf_hi[j] = |(ld_byte_hitvecfn_hi[j]) | ld_byte_ibuf_hit_hi[j];
|
|
for (genvar i = 0; i < DEPTH; i++) begin
|
|
assign ld_byte_hitvec_lo[j][i] = ld_addr_hitvec_lo[i] & buf_byteen[i][j] & ldst_byteen_lo_m[j];
|
|
assign ld_byte_hitvec_hi[j][i] = ld_addr_hitvec_hi[i] & buf_byteen[i][j] & ldst_byteen_hi_m[j];
|
|
|
|
assign ld_byte_hitvecfn_lo[j][i] = ld_byte_hitvec_lo[j][i] & ~(|(ld_byte_hitvec_lo[j] & buf_age_younger[i])) & ~ld_byte_ibuf_hit_lo[j]; // Kill the byte enable if younger entry exists or byte exists in ibuf
|
|
assign ld_byte_hitvecfn_hi[j][i] = ld_byte_hitvec_hi[j][i] & ~(|(ld_byte_hitvec_hi[j] & buf_age_younger[i])) & ~ld_byte_ibuf_hit_hi[j]; // Kill the byte enable if younger entry exists or byte exists in ibuf
|
|
end
|
|
end
|
|
|
|
// Hit in the ibuf
|
|
assign ld_addr_ibuf_hit_lo = (lsu_addr_m[31:2] == ibuf_addr[31:2]) & ibuf_write & ibuf_valid & lsu_busreq_m;
|
|
assign ld_addr_ibuf_hit_hi = (end_addr_m[31:2] == ibuf_addr[31:2]) & ibuf_write & ibuf_valid & lsu_busreq_m;
|
|
|
|
for (genvar i = 0; i < 4; i++) begin
|
|
assign ld_byte_ibuf_hit_lo[i] = ld_addr_ibuf_hit_lo & ibuf_byteen[i] & ldst_byteen_lo_m[i];
|
|
assign ld_byte_ibuf_hit_hi[i] = ld_addr_ibuf_hit_hi & ibuf_byteen[i] & ldst_byteen_hi_m[i];
|
|
end
|
|
|
|
always_comb begin
|
|
ld_fwddata_buf_lo[31:0] = {{8{ld_byte_ibuf_hit_lo[3]}},{8{ld_byte_ibuf_hit_lo[2]}},{8{ld_byte_ibuf_hit_lo[1]}},{8{ld_byte_ibuf_hit_lo[0]}}} & ibuf_data[31:0];
|
|
ld_fwddata_buf_hi[31:0] = {{8{ld_byte_ibuf_hit_hi[3]}},{8{ld_byte_ibuf_hit_hi[2]}},{8{ld_byte_ibuf_hit_hi[1]}},{8{ld_byte_ibuf_hit_hi[0]}}} & ibuf_data[31:0];
|
|
for (int i = 0; i < DEPTH; i++) begin
|
|
ld_fwddata_buf_lo[7:0] |= {8{ld_byte_hitvecfn_lo[0][i]}} & buf_data[i][7:0];
|
|
ld_fwddata_buf_lo[15:8] |= {8{ld_byte_hitvecfn_lo[1][i]}} & buf_data[i][15:8];
|
|
ld_fwddata_buf_lo[23:16] |= {8{ld_byte_hitvecfn_lo[2][i]}} & buf_data[i][23:16];
|
|
ld_fwddata_buf_lo[31:24] |= {8{ld_byte_hitvecfn_lo[3][i]}} & buf_data[i][31:24];
|
|
|
|
ld_fwddata_buf_hi[7:0] |= {8{ld_byte_hitvecfn_hi[0][i]}} & buf_data[i][7:0];
|
|
ld_fwddata_buf_hi[15:8] |= {8{ld_byte_hitvecfn_hi[1][i]}} & buf_data[i][15:8];
|
|
ld_fwddata_buf_hi[23:16] |= {8{ld_byte_hitvecfn_hi[2][i]}} & buf_data[i][23:16];
|
|
ld_fwddata_buf_hi[31:24] |= {8{ld_byte_hitvecfn_hi[3][i]}} & buf_data[i][31:24];
|
|
end
|
|
end
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Load forwarding logic end
|
|
//------------------------------------------------------------------------------
|
|
|
|
assign bus_coalescing_disable = dec_tlu_wb_coalescing_disable;
|
|
|
|
// Get the hi/lo byte enable
|
|
assign ldst_byteen_r[3:0] = ({4{lsu_pkt_r.by}} & 4'b0001) |
|
|
({4{lsu_pkt_r.half}} & 4'b0011) |
|
|
({4{lsu_pkt_r.word}} & 4'b1111);
|
|
|
|
assign {ldst_byteen_hi_r[3:0], ldst_byteen_lo_r[3:0]} = {4'b0,ldst_byteen_r[3:0]} << lsu_addr_r[1:0];
|
|
assign {store_data_hi_r[31:0], store_data_lo_r[31:0]} = {32'b0,store_data_r[31:0]} << 8*lsu_addr_r[1:0];
|
|
assign ldst_samedw_r = (lsu_addr_r[3] == end_addr_r[3]);
|
|
assign is_aligned_r = (lsu_pkt_r.word & (lsu_addr_r[1:0] == 2'b0)) |
|
|
(lsu_pkt_r.half & (lsu_addr_r[0] == 1'b0)) |
|
|
lsu_pkt_r.by;
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Input buffer logic starts here
|
|
//------------------------------------------------------------------------------
|
|
|
|
assign ibuf_byp = lsu_busreq_r & (lsu_pkt_r.load | no_word_merge_r) & ~ibuf_valid;
|
|
assign ibuf_wr_en = lsu_busreq_r & lsu_commit_r & ~ibuf_byp;
|
|
assign ibuf_rst = (ibuf_drain_vld & ~ibuf_wr_en) | dec_tlu_force_halt;
|
|
assign ibuf_force_drain = lsu_busreq_m & ~lsu_busreq_r & ibuf_valid & (lsu_pkt_m.load | (ibuf_addr[31:2] != lsu_addr_m[31:2])); // Move the ibuf to buf if there is a non-colaescable ld/st in m but nothing in r
|
|
assign ibuf_drain_vld = ibuf_valid & (((ibuf_wr_en | (ibuf_timer == TIMER_MAX)) & ~(ibuf_merge_en & ibuf_merge_in)) | ibuf_byp | ibuf_force_drain | ibuf_sideeffect | ~ibuf_write | bus_coalescing_disable);
|
|
assign ibuf_tag_in[DEPTH_LOG2-1:0] = (ibuf_merge_en & ibuf_merge_in) ? ibuf_tag[DEPTH_LOG2-1:0] : (ldst_dual_r ? WrPtr1_r : WrPtr0_r);
|
|
assign ibuf_dualtag_in[DEPTH_LOG2-1:0] = WrPtr0_r;
|
|
assign ibuf_sz_in[1:0] = {lsu_pkt_r.word, lsu_pkt_r.half};
|
|
assign ibuf_addr_in[31:0] = ldst_dual_r ? end_addr_r[31:0] : lsu_addr_r[31:0];
|
|
assign ibuf_byteen_in[3:0] = (ibuf_merge_en & ibuf_merge_in) ? (ibuf_byteen[3:0] | ldst_byteen_lo_r[3:0]) : (ldst_dual_r ? ldst_byteen_hi_r[3:0] : ldst_byteen_lo_r[3:0]);
|
|
for (genvar i = 0; i < 4; i++) begin
|
|
assign ibuf_data_in[(8*i)+7:(8*i)] = (ibuf_merge_en & ibuf_merge_in) ? (ldst_byteen_lo_r[i] ? store_data_lo_r[(8*i)+7:(8*i)] : ibuf_data[(8*i)+7:(8*i)]) :
|
|
(ldst_dual_r ? store_data_hi_r[(8*i)+7:(8*i)] : store_data_lo_r[(8*i)+7:(8*i)]);
|
|
end
|
|
assign ibuf_timer_in = ibuf_wr_en ? '0 : (ibuf_timer < TIMER_MAX) ? (ibuf_timer + 1'b1) : ibuf_timer;
|
|
|
|
|
|
assign ibuf_merge_en = lsu_busreq_r & lsu_commit_r & lsu_pkt_r.store & ibuf_valid & ibuf_write & (lsu_addr_r[31:2] == ibuf_addr[31:2]) & ~is_sideeffects_r & ~bus_coalescing_disable;
|
|
assign ibuf_merge_in = ~ldst_dual_r; // If it's a unaligned store, merge needs to happen on the way out of ibuf
|
|
|
|
// ibuf signals going to bus buffer after merging
|
|
for (genvar i = 0; i < 4; i++) begin
|
|
assign ibuf_byteen_out[i] = (ibuf_merge_en & ~ibuf_merge_in) ? (ibuf_byteen[i] | ldst_byteen_lo_r[i]) : ibuf_byteen[i];
|
|
assign ibuf_data_out[(8*i)+7:(8*i)] = (ibuf_merge_en & ~ibuf_merge_in) ? (ldst_byteen_lo_r[i] ? store_data_lo_r[(8*i)+7:(8*i)] : ibuf_data[(8*i)+7:(8*i)]) :
|
|
ibuf_data[(8*i)+7:(8*i)];
|
|
end
|
|
|
|
rvdffsc #(
|
|
.WIDTH(1)
|
|
) ibuf_valid_ff (
|
|
.din(1'b1),
|
|
.dout(ibuf_valid),
|
|
.en(ibuf_wr_en),
|
|
.clear(ibuf_rst),
|
|
.clk(lsu_free_c2_clk),
|
|
.*
|
|
);
|
|
rvdffs #(
|
|
.WIDTH(DEPTH_LOG2)
|
|
) ibuf_tagff (
|
|
.din (ibuf_tag_in),
|
|
.dout(ibuf_tag),
|
|
.en (ibuf_wr_en),
|
|
.clk (lsu_bus_ibuf_c1_clk),
|
|
.*
|
|
);
|
|
rvdffs #(
|
|
.WIDTH(DEPTH_LOG2)
|
|
) ibuf_dualtagff (
|
|
.din (ibuf_dualtag_in),
|
|
.dout(ibuf_dualtag),
|
|
.en (ibuf_wr_en),
|
|
.clk (lsu_bus_ibuf_c1_clk),
|
|
.*
|
|
);
|
|
rvdffs #(
|
|
.WIDTH(1)
|
|
) ibuf_dualff (
|
|
.din (ldst_dual_r),
|
|
.dout(ibuf_dual),
|
|
.en (ibuf_wr_en),
|
|
.clk (lsu_bus_ibuf_c1_clk),
|
|
.*
|
|
);
|
|
rvdffs #(
|
|
.WIDTH(1)
|
|
) ibuf_samedwff (
|
|
.din (ldst_samedw_r),
|
|
.dout(ibuf_samedw),
|
|
.en (ibuf_wr_en),
|
|
.clk (lsu_bus_ibuf_c1_clk),
|
|
.*
|
|
);
|
|
rvdffs #(
|
|
.WIDTH(1)
|
|
) ibuf_nomergeff (
|
|
.din (no_dword_merge_r),
|
|
.dout(ibuf_nomerge),
|
|
.en (ibuf_wr_en),
|
|
.clk (lsu_bus_ibuf_c1_clk),
|
|
.*
|
|
);
|
|
rvdffs #(
|
|
.WIDTH(1)
|
|
) ibuf_sideeffectff (
|
|
.din (is_sideeffects_r),
|
|
.dout(ibuf_sideeffect),
|
|
.en (ibuf_wr_en),
|
|
.clk (lsu_bus_ibuf_c1_clk),
|
|
.*
|
|
);
|
|
rvdffs #(
|
|
.WIDTH(1)
|
|
) ibuf_unsignff (
|
|
.din (lsu_pkt_r.unsign),
|
|
.dout(ibuf_unsign),
|
|
.en (ibuf_wr_en),
|
|
.clk (lsu_bus_ibuf_c1_clk),
|
|
.*
|
|
);
|
|
rvdffs #(
|
|
.WIDTH(1)
|
|
) ibuf_writeff (
|
|
.din (lsu_pkt_r.store),
|
|
.dout(ibuf_write),
|
|
.en (ibuf_wr_en),
|
|
.clk (lsu_bus_ibuf_c1_clk),
|
|
.*
|
|
);
|
|
rvdffs #(
|
|
.WIDTH(2)
|
|
) ibuf_szff (
|
|
.din (ibuf_sz_in[1:0]),
|
|
.dout(ibuf_sz),
|
|
.en (ibuf_wr_en),
|
|
.clk (lsu_bus_ibuf_c1_clk),
|
|
.*
|
|
);
|
|
rvdffe #(
|
|
.WIDTH(32)
|
|
) ibuf_addrff (
|
|
.din (ibuf_addr_in[31:0]),
|
|
.dout(ibuf_addr),
|
|
.en (ibuf_wr_en),
|
|
.*
|
|
);
|
|
rvdffs #(
|
|
.WIDTH(4)
|
|
) ibuf_byteenff (
|
|
.din (ibuf_byteen_in[3:0]),
|
|
.dout(ibuf_byteen),
|
|
.en (ibuf_wr_en),
|
|
.clk (lsu_bus_ibuf_c1_clk),
|
|
.*
|
|
);
|
|
rvdffe #(
|
|
.WIDTH(32)
|
|
) ibuf_dataff (
|
|
.din (ibuf_data_in[31:0]),
|
|
.dout(ibuf_data),
|
|
.en (ibuf_wr_en),
|
|
.*
|
|
);
|
|
rvdff #(
|
|
.WIDTH(TIMER_LOG2)
|
|
) ibuf_timerff (
|
|
.din (ibuf_timer_in),
|
|
.dout(ibuf_timer),
|
|
.clk (lsu_free_c2_clk),
|
|
.*
|
|
);
|
|
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Input buffer logic ends here
|
|
//------------------------------------------------------------------------------
|
|
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Output buffer logic starts here
|
|
//------------------------------------------------------------------------------
|
|
|
|
assign obuf_wr_wait = (buf_numvld_wrcmd_any[3:0] == 4'b1) & (buf_numvld_cmd_any[3:0] == 4'b1) & (obuf_wr_timer != TIMER_MAX) &
|
|
~bus_coalescing_disable & ~buf_nomerge[CmdPtr0] & ~buf_sideeffect[CmdPtr0] & ~obuf_force_wr_en;
|
|
assign obuf_wr_timer_in = obuf_wr_en ? 3'b0: (((buf_numvld_cmd_any > 4'b0) & (obuf_wr_timer < TIMER_MAX)) ? (obuf_wr_timer + 1'b1) : obuf_wr_timer);
|
|
assign obuf_force_wr_en = lsu_busreq_m & ~lsu_busreq_r & ~ibuf_valid & (buf_numvld_cmd_any[3:0] == 4'b1) & (lsu_addr_m[31:2] != buf_addr[CmdPtr0][31:2]); // Entry in m can't merge with entry going to obuf and there is no entry in between
|
|
assign ibuf_buf_byp = ibuf_byp & (buf_numvld_pend_any[3:0] == 4'b0) & (~lsu_pkt_r.store | no_dword_merge_r);
|
|
|
|
assign obuf_wr_en = ((ibuf_buf_byp & lsu_commit_r & ~(is_sideeffects_r & bus_sideeffect_pend)) |
|
|
((buf_state[CmdPtr0] == CMD) & found_cmdptr0 & ~buf_cmd_state_bus_en[CmdPtr0] & ~(buf_sideeffect[CmdPtr0] & bus_sideeffect_pend) &
|
|
(~(buf_dual[CmdPtr0] & buf_samedw[CmdPtr0] & ~buf_write[CmdPtr0]) | found_cmdptr1 | buf_nomerge[CmdPtr0] | obuf_force_wr_en))) &
|
|
(bus_cmd_ready | ~obuf_valid | obuf_nosend) & ~obuf_wr_wait & ~bus_addr_match_pending & lsu_bus_clk_en;
|
|
|
|
assign obuf_rst = ((bus_cmd_sent | (obuf_valid & obuf_nosend)) & ~obuf_wr_en & lsu_bus_clk_en) | dec_tlu_force_halt;
|
|
|
|
assign obuf_write_in = ibuf_buf_byp ? lsu_pkt_r.store : buf_write[CmdPtr0];
|
|
assign obuf_sideeffect_in = ibuf_buf_byp ? is_sideeffects_r : buf_sideeffect[CmdPtr0];
|
|
assign obuf_addr_in[31:0] = ibuf_buf_byp ? lsu_addr_r[31:0] : buf_addr[CmdPtr0];
|
|
assign obuf_sz_in[1:0] = ibuf_buf_byp ? {lsu_pkt_r.word, lsu_pkt_r.half} : buf_sz[CmdPtr0];
|
|
assign obuf_merge_in = obuf_merge_en;
|
|
assign obuf_tag0_in[pt.LSU_BUS_TAG-1:0] = ibuf_buf_byp ? (pt.LSU_BUS_TAG)'(WrPtr0_r) : (pt.LSU_BUS_TAG)'(CmdPtr0);
|
|
assign obuf_tag1_in[pt.LSU_BUS_TAG-1:0] = ibuf_buf_byp ? (pt.LSU_BUS_TAG)'(WrPtr1_r) : (pt.LSU_BUS_TAG)'(CmdPtr1);
|
|
|
|
assign obuf_cmd_done_in = ~(obuf_wr_en | obuf_rst) & (obuf_cmd_done | bus_wcmd_sent);
|
|
assign obuf_data_done_in = ~(obuf_wr_en | obuf_rst) & (obuf_data_done | bus_wdata_sent);
|
|
|
|
assign obuf_aligned_in = ibuf_buf_byp ? is_aligned_r : ((obuf_sz_in[1:0] == 2'b0) |
|
|
(obuf_sz_in[0] & ~obuf_addr_in[0]) |
|
|
(obuf_sz_in[1] & ~(|obuf_addr_in[1:0])));
|
|
|
|
assign obuf_rdrsp_pend_in = ((~(obuf_wr_en & ~obuf_nosend_in) & obuf_rdrsp_pend & ~(bus_rsp_read & (bus_rsp_read_tag == obuf_rdrsp_tag))) | (bus_cmd_sent & ~obuf_write)) & ~dec_tlu_force_halt;
|
|
assign obuf_rdrsp_pend_en = lsu_bus_clk_en | dec_tlu_force_halt;
|
|
assign obuf_rdrsp_tag_in[pt.LSU_BUS_TAG-1:0] = (bus_cmd_sent & ~obuf_write) ? obuf_tag0[pt.LSU_BUS_TAG-1:0] : obuf_rdrsp_tag[pt.LSU_BUS_TAG-1:0];
|
|
// No ld to ld fwd for aligned
|
|
assign obuf_nosend_in = (obuf_addr_in[31:3] == obuf_addr[31:3]) & obuf_aligned_in & ~obuf_sideeffect & ~obuf_write & ~obuf_write_in & ~dec_tlu_external_ldfwd_disable &
|
|
((obuf_valid & ~obuf_nosend) | (obuf_rdrsp_pend & ~(bus_rsp_read & (bus_rsp_read_tag == obuf_rdrsp_tag))));
|
|
|
|
assign obuf_byteen0_in[7:0] = ibuf_buf_byp ? (lsu_addr_r[2] ? {ldst_byteen_lo_r[3:0],4'b0} : {4'b0,ldst_byteen_lo_r[3:0]}) :
|
|
(buf_addr[CmdPtr0][2] ? {buf_byteen[CmdPtr0],4'b0} : {4'b0,buf_byteen[CmdPtr0]});
|
|
assign obuf_byteen1_in[7:0] = ibuf_buf_byp ? (end_addr_r[2] ? {ldst_byteen_hi_r[3:0],4'b0} : {4'b0,ldst_byteen_hi_r[3:0]}) :
|
|
(buf_addr[CmdPtr1][2] ? {buf_byteen[CmdPtr1],4'b0} : {4'b0,buf_byteen[CmdPtr1]});
|
|
assign obuf_data0_in[63:0] = ibuf_buf_byp ? (lsu_addr_r[2] ? {store_data_lo_r[31:0],32'b0} : {32'b0,store_data_lo_r[31:0]}) :
|
|
(buf_addr[CmdPtr0][2] ? {buf_data[CmdPtr0],32'b0} : {32'b0,buf_data[CmdPtr0]});
|
|
assign obuf_data1_in[63:0] = ibuf_buf_byp ? (end_addr_r[2] ? {store_data_hi_r[31:0],32'b0} :{32'b0,store_data_hi_r[31:0]}) :
|
|
(buf_addr[CmdPtr1][2] ? {buf_data[CmdPtr1],32'b0} : {32'b0,buf_data[CmdPtr1]});
|
|
|
|
for (genvar i = 0; i < 8; i++) begin
|
|
assign obuf_byteen_in[i] = obuf_byteen0_in[i] | (obuf_merge_en & obuf_byteen1_in[i]);
|
|
assign obuf_data_in[(8*i)+7:(8*i)] = (obuf_merge_en & obuf_byteen1_in[i]) ? obuf_data1_in[(8*i)+7:(8*i)] : obuf_data0_in[(8*i)+7:(8*i)];
|
|
end
|
|
|
|
// No store obuf merging for AXI since all stores are sent non-posted. Can't track the second id right now
|
|
assign obuf_merge_en = ((CmdPtr0 != CmdPtr1) & found_cmdptr0 & found_cmdptr1 & (buf_state[CmdPtr0] == CMD) & (buf_state[CmdPtr1] == CMD) &
|
|
~buf_cmd_state_bus_en[CmdPtr0] & ~buf_sideeffect[CmdPtr0] &
|
|
(~buf_write[CmdPtr0] & buf_dual[CmdPtr0] & ~buf_dualhi[CmdPtr0] & buf_samedw[CmdPtr0])) | // CmdPtr0/CmdPtr1 are for same load which is within a DW
|
|
(ibuf_buf_byp & ldst_samedw_r & ldst_dual_r);
|
|
|
|
|
|
rvdff #(
|
|
.WIDTH(1)
|
|
) obuf_wren_ff (
|
|
.din(obuf_wr_en),
|
|
.dout(obuf_wr_enQ),
|
|
.clk(lsu_busm_clk),
|
|
.*
|
|
);
|
|
rvdffsc #(
|
|
.WIDTH(1)
|
|
) obuf_valid_ff (
|
|
.din(1'b1),
|
|
.dout(obuf_valid),
|
|
.en(obuf_wr_en),
|
|
.clear(obuf_rst),
|
|
.clk(lsu_free_c2_clk),
|
|
.*
|
|
);
|
|
rvdffs #(
|
|
.WIDTH(1)
|
|
) obuf_nosend_ff (
|
|
.din (obuf_nosend_in),
|
|
.dout(obuf_nosend),
|
|
.en (obuf_wr_en),
|
|
.clk (lsu_free_c2_clk),
|
|
.*
|
|
);
|
|
rvdffs #(
|
|
.WIDTH(1)
|
|
) obuf_rdrsp_pend_ff (
|
|
.din (obuf_rdrsp_pend_in),
|
|
.dout(obuf_rdrsp_pend),
|
|
.en (obuf_rdrsp_pend_en),
|
|
.clk (lsu_free_c2_clk),
|
|
.*
|
|
);
|
|
rvdff #(
|
|
.WIDTH(1)
|
|
) obuf_cmd_done_ff (
|
|
.din(obuf_cmd_done_in),
|
|
.dout(obuf_cmd_done),
|
|
.clk(lsu_busm_clk),
|
|
.*
|
|
);
|
|
rvdff #(
|
|
.WIDTH(1)
|
|
) obuf_data_done_ff (
|
|
.din(obuf_data_done_in),
|
|
.dout(obuf_data_done),
|
|
.clk(lsu_busm_clk),
|
|
.*
|
|
);
|
|
rvdff #(
|
|
.WIDTH(pt.LSU_BUS_TAG)
|
|
) obuf_rdrsp_tagff (
|
|
.din(obuf_rdrsp_tag_in),
|
|
.dout(obuf_rdrsp_tag),
|
|
.clk(lsu_busm_clk),
|
|
.*
|
|
);
|
|
rvdffs #(
|
|
.WIDTH(pt.LSU_BUS_TAG)
|
|
) obuf_tag0ff (
|
|
.din(obuf_tag0_in),
|
|
.dout(obuf_tag0),
|
|
.en(obuf_wr_en),
|
|
.clk(lsu_bus_obuf_c1_clk),
|
|
.*
|
|
);
|
|
rvdffs #(
|
|
.WIDTH(pt.LSU_BUS_TAG)
|
|
) obuf_tag1ff (
|
|
.din(obuf_tag1_in),
|
|
.dout(obuf_tag1),
|
|
.en(obuf_wr_en),
|
|
.clk(lsu_bus_obuf_c1_clk),
|
|
.*
|
|
);
|
|
rvdffs #(
|
|
.WIDTH(1)
|
|
) obuf_mergeff (
|
|
.din(obuf_merge_in),
|
|
.dout(obuf_merge),
|
|
.en(obuf_wr_en),
|
|
.clk(lsu_bus_obuf_c1_clk),
|
|
.*
|
|
);
|
|
rvdffs #(
|
|
.WIDTH(1)
|
|
) obuf_writeff (
|
|
.din(obuf_write_in),
|
|
.dout(obuf_write),
|
|
.en(obuf_wr_en),
|
|
.clk(lsu_bus_obuf_c1_clk),
|
|
.*
|
|
);
|
|
rvdffs #(
|
|
.WIDTH(1)
|
|
) obuf_sideeffectff (
|
|
.din(obuf_sideeffect_in),
|
|
.dout(obuf_sideeffect),
|
|
.en(obuf_wr_en),
|
|
.clk(lsu_bus_obuf_c1_clk),
|
|
.*
|
|
);
|
|
rvdffs #(
|
|
.WIDTH(2)
|
|
) obuf_szff (
|
|
.din(obuf_sz_in[1:0]),
|
|
.dout(obuf_sz),
|
|
.en(obuf_wr_en),
|
|
.clk(lsu_bus_obuf_c1_clk),
|
|
.*
|
|
);
|
|
rvdffs #(
|
|
.WIDTH(8)
|
|
) obuf_byteenff (
|
|
.din(obuf_byteen_in[7:0]),
|
|
.dout(obuf_byteen),
|
|
.en(obuf_wr_en),
|
|
.clk(lsu_bus_obuf_c1_clk),
|
|
.*
|
|
);
|
|
rvdffe #(
|
|
.WIDTH(32)
|
|
) obuf_addrff (
|
|
.din (obuf_addr_in[31:0]),
|
|
.dout(obuf_addr),
|
|
.en (obuf_wr_en),
|
|
.*
|
|
);
|
|
rvdffe #(
|
|
.WIDTH(64)
|
|
) obuf_dataff (
|
|
.din (obuf_data_in[63:0]),
|
|
.dout(obuf_data),
|
|
.en (obuf_wr_en),
|
|
.*
|
|
);
|
|
rvdff #(
|
|
.WIDTH(TIMER_LOG2)
|
|
) obuf_timerff (
|
|
.din(obuf_wr_timer_in),
|
|
.dout(obuf_wr_timer),
|
|
.clk(lsu_busm_clk),
|
|
.*
|
|
);
|
|
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Output buffer logic ends here
|
|
//------------------------------------------------------------------------------
|
|
|
|
// Find the entry to allocate and entry to send
|
|
always_comb begin
|
|
WrPtr0_m[DEPTH_LOG2-1:0] = '0;
|
|
WrPtr1_m[DEPTH_LOG2-1:0] = '0;
|
|
found_wrptr0 = '0;
|
|
found_wrptr1 = '0;
|
|
|
|
// Find first write pointer
|
|
for (int i = 0; i < DEPTH; i++) begin
|
|
if (~found_wrptr0) begin
|
|
WrPtr0_m[DEPTH_LOG2-1:0] = DEPTH_LOG2'(i);
|
|
found_wrptr0 = (buf_state[i] == IDLE) & ~((ibuf_valid & (ibuf_tag == i)) |
|
|
(lsu_busreq_r & ((WrPtr0_r == i) | (ldst_dual_r & (WrPtr1_r == i)))));
|
|
end
|
|
end
|
|
|
|
// Find second write pointer
|
|
for (int i = 0; i < DEPTH; i++) begin
|
|
if (~found_wrptr1) begin
|
|
WrPtr1_m[DEPTH_LOG2-1:0] = DEPTH_LOG2'(i);
|
|
found_wrptr1 = (buf_state[i] == IDLE) & ~((ibuf_valid & (ibuf_tag == i)) |
|
|
(lsu_busreq_m & (WrPtr0_m == i)) |
|
|
(lsu_busreq_r & ((WrPtr0_r == i) | (ldst_dual_r & (WrPtr1_r == i)))));
|
|
end
|
|
end
|
|
end
|
|
|
|
// Get the command ptr
|
|
for (genvar i = 0; i < DEPTH; i++) begin
|
|
// These should be one-hot
|
|
assign CmdPtr0Dec[i] = ~(|buf_age[i]) & (buf_state[i] == CMD) & ~buf_cmd_state_bus_en[i];
|
|
assign CmdPtr1Dec[i] = ~(|(buf_age[i] & ~CmdPtr0Dec)) & ~CmdPtr0Dec[i] & (buf_state[i] == CMD) & ~buf_cmd_state_bus_en[i];
|
|
assign RspPtrDec[i] = ~(|buf_rsp_pickage[i]) & (buf_state[i] == DONE_WAIT);
|
|
end
|
|
|
|
assign found_cmdptr0 = |CmdPtr0Dec;
|
|
assign found_cmdptr1 = |CmdPtr1Dec;
|
|
assign CmdPtr0 = f_Enc8to3(8'(CmdPtr0Dec[DEPTH-1:0]));
|
|
assign CmdPtr1 = f_Enc8to3(8'(CmdPtr1Dec[DEPTH-1:0]));
|
|
assign RspPtr = f_Enc8to3(8'(RspPtrDec[DEPTH-1:0]));
|
|
|
|
// Age vector
|
|
for (genvar i = 0; i < DEPTH; i++) begin : GenAgeVec
|
|
for (genvar j = 0; j < DEPTH; j++) begin
|
|
assign buf_age_in[i][j] = (((buf_state[i] == IDLE) & buf_state_en[i]) &
|
|
(((buf_state[j] == WAIT) | ((buf_state[j] == CMD) & ~buf_cmd_state_bus_en[j])) | // Set age bit for older entries
|
|
(ibuf_drain_vld & lsu_busreq_r & (ibuf_byp | ldst_dual_r) & (i == WrPtr0_r) & (j == ibuf_tag)) | // Set case for dual lo
|
|
(ibuf_byp & lsu_busreq_r & ldst_dual_r & (i == WrPtr1_r) & (j == WrPtr0_r)))) | // ibuf bypass case
|
|
buf_age[i][j];
|
|
|
|
|
|
assign buf_age[i][j] = buf_ageQ[i][j] & ~((buf_state[j] == CMD) & buf_cmd_state_bus_en[j]) & ~dec_tlu_force_halt; // Reset case
|
|
|
|
assign buf_age_younger[i][j] = (i == j) ? 1'b0: (~buf_age[i][j] & (buf_state[j] != IDLE)); // Younger entries
|
|
end
|
|
end
|
|
|
|
// Age vector for responses
|
|
for (genvar i = 0; i < DEPTH; i++) begin : GenRspAgeVec
|
|
for (genvar j = 0; j < DEPTH; j++) begin
|
|
assign buf_rspage_set[i][j] = ((buf_state[i] == IDLE) & buf_state_en[i]) &
|
|
(~((buf_state[j] == IDLE) | (buf_state[j] == DONE)) | // Set age bit for older entries
|
|
(ibuf_drain_vld & lsu_busreq_r & (ibuf_byp | ldst_dual_r) & (DEPTH_LOG2'(i) == WrPtr0_r) & (DEPTH_LOG2'(j) == ibuf_tag)) | // Set case for dual lo
|
|
(ibuf_byp & lsu_busreq_r & ldst_dual_r & (DEPTH_LOG2'(i) == WrPtr1_r) & (DEPTH_LOG2'(j) == WrPtr0_r)));
|
|
assign buf_rspage_in[i][j] = buf_rspage_set[i][j] | buf_rspage[i][j];
|
|
assign buf_rspage[i][j] = buf_rspageQ[i][j] & ~((buf_state[j] == DONE) | (buf_state[j] == IDLE)) & ~dec_tlu_force_halt; // Reset case
|
|
assign buf_rsp_pickage[i][j] = buf_rspageQ[i][j] & (buf_state[j] == DONE_WAIT);
|
|
end
|
|
end
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Buffer logic
|
|
//------------------------------------------------------------------------------
|
|
for (genvar i = 0; i < DEPTH; i++) begin
|
|
|
|
assign ibuf_drainvec_vld[i] = (ibuf_drain_vld & (i == ibuf_tag));
|
|
assign buf_byteen_in[i] = ibuf_drainvec_vld[i] ? ibuf_byteen_out[3:0] : ((ibuf_byp & ldst_dual_r & (i == WrPtr1_r)) ? ldst_byteen_hi_r[3:0] : ldst_byteen_lo_r[3:0]);
|
|
assign buf_addr_in[i] = ibuf_drainvec_vld[i] ? ibuf_addr[31:0] : ((ibuf_byp & ldst_dual_r & (i == WrPtr1_r)) ? end_addr_r[31:0] : lsu_addr_r[31:0]);
|
|
assign buf_dual_in[i] = ibuf_drainvec_vld[i] ? ibuf_dual : ldst_dual_r;
|
|
assign buf_samedw_in[i] = ibuf_drainvec_vld[i] ? ibuf_samedw : ldst_samedw_r;
|
|
assign buf_nomerge_in[i] = ibuf_drainvec_vld[i] ? (ibuf_nomerge | ibuf_force_drain) : no_dword_merge_r;
|
|
assign buf_dualhi_in[i] = ibuf_drainvec_vld[i] ? ibuf_dual : (ibuf_byp & ldst_dual_r & (i == WrPtr1_r)); // If it's dual, ibuf will always have the high
|
|
assign buf_dualtag_in[i] = ibuf_drainvec_vld[i] ? ibuf_dualtag : ((ibuf_byp & ldst_dual_r & (i == WrPtr1_r)) ? WrPtr0_r : WrPtr1_r);
|
|
assign buf_sideeffect_in[i] = ibuf_drainvec_vld[i] ? ibuf_sideeffect : is_sideeffects_r;
|
|
assign buf_unsign_in[i] = ibuf_drainvec_vld[i] ? ibuf_unsign : lsu_pkt_r.unsign;
|
|
assign buf_sz_in[i] = ibuf_drainvec_vld[i] ? ibuf_sz : {lsu_pkt_r.word, lsu_pkt_r.half};
|
|
assign buf_write_in[i] = ibuf_drainvec_vld[i] ? ibuf_write : lsu_pkt_r.store;
|
|
|
|
// Buffer entry state machine
|
|
always_comb begin
|
|
buf_nxtstate[i] = IDLE;
|
|
buf_state_en[i] = '0;
|
|
buf_resp_state_bus_en[i] = '0;
|
|
buf_state_bus_en[i] = '0;
|
|
buf_wr_en[i] = '0;
|
|
buf_data_in[i] = '0;
|
|
buf_data_en[i] = '0;
|
|
buf_error_en[i] = '0;
|
|
buf_rst[i] = dec_tlu_force_halt;
|
|
buf_ldfwd_en[i] = dec_tlu_force_halt;
|
|
buf_ldfwd_in[i] = '0;
|
|
buf_ldfwdtag_in[i] = '0;
|
|
|
|
case (buf_state[i])
|
|
IDLE: begin
|
|
buf_nxtstate[i] = lsu_bus_clk_en ? CMD : WAIT;
|
|
buf_state_en[i] = (lsu_busreq_r & lsu_commit_r & (((ibuf_byp | ldst_dual_r) & ~ibuf_merge_en & (i == WrPtr0_r)) | (ibuf_byp & ldst_dual_r & (i == WrPtr1_r)))) |
|
|
(ibuf_drain_vld & (i == ibuf_tag));
|
|
buf_wr_en[i] = buf_state_en[i];
|
|
buf_data_en[i] = buf_state_en[i];
|
|
buf_data_in[i] = (ibuf_drain_vld & (i == ibuf_tag)) ? ibuf_data_out[31:0] : store_data_lo_r[31:0];
|
|
buf_cmd_state_bus_en[i] = '0;
|
|
end
|
|
WAIT: begin
|
|
buf_nxtstate[i] = dec_tlu_force_halt ? IDLE : CMD;
|
|
buf_state_en[i] = lsu_bus_clk_en | dec_tlu_force_halt;
|
|
buf_cmd_state_bus_en[i] = '0;
|
|
end
|
|
CMD: begin
|
|
buf_nxtstate[i] = dec_tlu_force_halt ? IDLE : (obuf_nosend & bus_rsp_read & (bus_rsp_read_tag == obuf_rdrsp_tag)) ? DONE_WAIT : RESP;
|
|
buf_cmd_state_bus_en[i] = ((obuf_tag0 == i) | (obuf_merge & (obuf_tag1 == i))) & obuf_valid & obuf_wr_enQ; // Just use the recently written obuf_valid
|
|
buf_state_bus_en[i] = buf_cmd_state_bus_en[i];
|
|
buf_state_en[i] = (buf_state_bus_en[i] & lsu_bus_clk_en) | dec_tlu_force_halt;
|
|
buf_ldfwd_in[i] = 1'b1;
|
|
buf_ldfwd_en[i] = buf_state_en[i] & ~buf_write[i] & obuf_nosend & ~dec_tlu_force_halt;
|
|
buf_ldfwdtag_in[i] = DEPTH_LOG2'(obuf_rdrsp_tag[pt.LSU_BUS_TAG-2:0]);
|
|
buf_data_en[i] = buf_state_bus_en[i] & lsu_bus_clk_en & obuf_nosend & bus_rsp_read;
|
|
buf_error_en[i] = buf_state_bus_en[i] & lsu_bus_clk_en & obuf_nosend & bus_rsp_read_error;
|
|
buf_data_in[i] = buf_error_en[i] ? bus_rsp_rdata[31:0] : (buf_addr[i][2] ? bus_rsp_rdata[63:32] : bus_rsp_rdata[31:0]);
|
|
end
|
|
RESP: begin
|
|
buf_nxtstate[i] = (dec_tlu_force_halt | (buf_write[i] & ~bus_rsp_write_error)) ? IDLE : // Side-effect writes will be non-posted
|
|
(buf_dual[i] & ~buf_samedw[i] & ~buf_write[i] & (buf_state[buf_dualtag[i]] != DONE_PARTIAL)) ? DONE_PARTIAL : // Goto DONE_PARTIAL if this is the first return of dual
|
|
(buf_ldfwd[i] | any_done_wait_state |
|
|
(buf_dual[i] & ~buf_samedw[i] & ~buf_write[i] & buf_ldfwd[buf_dualtag[i]] &
|
|
(buf_state[buf_dualtag[i]] == DONE_PARTIAL) & any_done_wait_state)) ? DONE_WAIT : DONE;
|
|
buf_resp_state_bus_en[i] = (bus_rsp_write & (bus_rsp_write_tag == (pt.LSU_BUS_TAG)'(i))) |
|
|
(bus_rsp_read & ((bus_rsp_read_tag == (pt.LSU_BUS_TAG)'(i)) |
|
|
(buf_ldfwd[i] & (bus_rsp_read_tag == (pt.LSU_BUS_TAG)'(buf_ldfwdtag[i]))) |
|
|
(buf_dual[i] & buf_dualhi[i] & ~buf_write[i] & buf_samedw[i] & (bus_rsp_read_tag == (pt.LSU_BUS_TAG)'(buf_dualtag[i])))));
|
|
buf_state_bus_en[i] = buf_resp_state_bus_en[i];
|
|
buf_state_en[i] = (buf_state_bus_en[i] & lsu_bus_clk_en) | dec_tlu_force_halt;
|
|
buf_data_en[i] = buf_state_bus_en[i] & bus_rsp_read & lsu_bus_clk_en;
|
|
// Need to capture the error for stores as well for AXI
|
|
buf_error_en[i] = buf_state_bus_en[i] & lsu_bus_clk_en & ((bus_rsp_read_error & (bus_rsp_read_tag == (pt.LSU_BUS_TAG)'(i))) |
|
|
(bus_rsp_read_error & buf_ldfwd[i] & (bus_rsp_read_tag == (pt.LSU_BUS_TAG)'(buf_ldfwdtag[i]))) |
|
|
(bus_rsp_write_error & (bus_rsp_write_tag == (pt.LSU_BUS_TAG)'(i))));
|
|
buf_data_in[i][31:0] = (buf_state_en[i] & ~buf_error_en[i]) ? (buf_addr[i][2] ? bus_rsp_rdata[63:32] : bus_rsp_rdata[31:0]) : bus_rsp_rdata[31:0];
|
|
buf_cmd_state_bus_en[i] = '0;
|
|
end
|
|
DONE_PARTIAL: begin // Other part of dual load hasn't returned
|
|
buf_nxtstate[i] = dec_tlu_force_halt ? IDLE : (buf_ldfwd[i] | buf_ldfwd[buf_dualtag[i]] | any_done_wait_state) ? DONE_WAIT : DONE;
|
|
buf_state_bus_en[i] = bus_rsp_read & ((bus_rsp_read_tag == (pt.LSU_BUS_TAG)'(buf_dualtag[i])) |
|
|
(buf_ldfwd[buf_dualtag[i]] & (bus_rsp_read_tag == (pt.LSU_BUS_TAG)'(buf_ldfwdtag[buf_dualtag[i]]))));
|
|
buf_state_en[i] = (buf_state_bus_en[i] & lsu_bus_clk_en) | dec_tlu_force_halt;
|
|
buf_cmd_state_bus_en[i] = '0;
|
|
end
|
|
DONE_WAIT: begin // WAIT state if there are multiple outstanding nb returns
|
|
buf_nxtstate[i] = dec_tlu_force_halt ? IDLE : DONE;
|
|
buf_state_en[i] = ((RspPtr == DEPTH_LOG2'(i)) | (buf_dual[i] & (buf_dualtag[i] == RspPtr))) | dec_tlu_force_halt;
|
|
buf_cmd_state_bus_en[i] = '0;
|
|
end
|
|
DONE: begin
|
|
buf_nxtstate[i] = IDLE;
|
|
buf_rst[i] = 1'b1;
|
|
buf_state_en[i] = 1'b1;
|
|
buf_ldfwd_in[i] = 1'b0;
|
|
buf_ldfwd_en[i] = buf_state_en[i];
|
|
buf_cmd_state_bus_en[i] = '0;
|
|
end
|
|
default: begin
|
|
buf_nxtstate[i] = IDLE;
|
|
buf_state_en[i] = '0;
|
|
buf_resp_state_bus_en[i] = '0;
|
|
buf_state_bus_en[i] = '0;
|
|
buf_wr_en[i] = '0;
|
|
buf_data_in[i] = '0;
|
|
buf_data_en[i] = '0;
|
|
buf_error_en[i] = '0;
|
|
buf_rst[i] = '0;
|
|
buf_cmd_state_bus_en[i] = '0;
|
|
end
|
|
endcase
|
|
end
|
|
|
|
rvdffs #(
|
|
.WIDTH($bits(state_t))
|
|
) buf_state_ff (
|
|
.din (buf_nxtstate[i]),
|
|
.dout({buf_state[i]}),
|
|
.en (buf_state_en[i]),
|
|
.clk (lsu_bus_buf_c1_clk),
|
|
.*
|
|
);
|
|
rvdff #(
|
|
.WIDTH(DEPTH)
|
|
) buf_ageff (
|
|
.din (buf_age_in[i]),
|
|
.dout(buf_ageQ[i]),
|
|
.clk (lsu_bus_buf_c1_clk),
|
|
.*
|
|
);
|
|
rvdff #(
|
|
.WIDTH(DEPTH)
|
|
) buf_rspageff (
|
|
.din (buf_rspage_in[i]),
|
|
.dout(buf_rspageQ[i]),
|
|
.clk (lsu_bus_buf_c1_clk),
|
|
.*
|
|
);
|
|
rvdffs #(
|
|
.WIDTH(DEPTH_LOG2)
|
|
) buf_dualtagff (
|
|
.din (buf_dualtag_in[i]),
|
|
.dout(buf_dualtag[i]),
|
|
.en (buf_wr_en[i]),
|
|
.clk (lsu_bus_buf_c1_clk),
|
|
.*
|
|
);
|
|
rvdffs #(
|
|
.WIDTH(1)
|
|
) buf_dualff (
|
|
.din (buf_dual_in[i]),
|
|
.dout(buf_dual[i]),
|
|
.en (buf_wr_en[i]),
|
|
.clk (lsu_bus_buf_c1_clk),
|
|
.*
|
|
);
|
|
rvdffs #(
|
|
.WIDTH(1)
|
|
) buf_samedwff (
|
|
.din (buf_samedw_in[i]),
|
|
.dout(buf_samedw[i]),
|
|
.en (buf_wr_en[i]),
|
|
.clk (lsu_bus_buf_c1_clk),
|
|
.*
|
|
);
|
|
rvdffs #(
|
|
.WIDTH(1)
|
|
) buf_nomergeff (
|
|
.din (buf_nomerge_in[i]),
|
|
.dout(buf_nomerge[i]),
|
|
.en (buf_wr_en[i]),
|
|
.clk (lsu_bus_buf_c1_clk),
|
|
.*
|
|
);
|
|
rvdffs #(
|
|
.WIDTH(1)
|
|
) buf_dualhiff (
|
|
.din (buf_dualhi_in[i]),
|
|
.dout(buf_dualhi[i]),
|
|
.en (buf_wr_en[i]),
|
|
.clk (lsu_bus_buf_c1_clk),
|
|
.*
|
|
);
|
|
rvdffs #(
|
|
.WIDTH(1)
|
|
) buf_ldfwdff (
|
|
.din (buf_ldfwd_in[i]),
|
|
.dout(buf_ldfwd[i]),
|
|
.en (buf_ldfwd_en[i]),
|
|
.clk (lsu_bus_buf_c1_clk),
|
|
.*
|
|
);
|
|
rvdffs #(
|
|
.WIDTH(DEPTH_LOG2)
|
|
) buf_ldfwdtagff (
|
|
.din (buf_ldfwdtag_in[i]),
|
|
.dout(buf_ldfwdtag[i]),
|
|
.en (buf_ldfwd_en[i]),
|
|
.clk (lsu_bus_buf_c1_clk),
|
|
.*
|
|
);
|
|
rvdffs #(
|
|
.WIDTH(1)
|
|
) buf_sideeffectff (
|
|
.din (buf_sideeffect_in[i]),
|
|
.dout(buf_sideeffect[i]),
|
|
.en (buf_wr_en[i]),
|
|
.clk (lsu_bus_buf_c1_clk),
|
|
.*
|
|
);
|
|
rvdffs #(
|
|
.WIDTH(1)
|
|
) buf_unsignff (
|
|
.din (buf_unsign_in[i]),
|
|
.dout(buf_unsign[i]),
|
|
.en (buf_wr_en[i]),
|
|
.clk (lsu_bus_buf_c1_clk),
|
|
.*
|
|
);
|
|
rvdffs #(
|
|
.WIDTH(1)
|
|
) buf_writeff (
|
|
.din (buf_write_in[i]),
|
|
.dout(buf_write[i]),
|
|
.en (buf_wr_en[i]),
|
|
.clk (lsu_bus_buf_c1_clk),
|
|
.*
|
|
);
|
|
rvdffs #(
|
|
.WIDTH(2)
|
|
) buf_szff (
|
|
.din (buf_sz_in[i]),
|
|
.dout(buf_sz[i]),
|
|
.en (buf_wr_en[i]),
|
|
.clk (lsu_bus_buf_c1_clk),
|
|
.*
|
|
);
|
|
rvdffe #(
|
|
.WIDTH(32)
|
|
) buf_addrff (
|
|
.din (buf_addr_in[i][31:0]),
|
|
.dout(buf_addr[i]),
|
|
.en (buf_wr_en[i]),
|
|
.*
|
|
);
|
|
rvdffs #(
|
|
.WIDTH(4)
|
|
) buf_byteenff (
|
|
.din (buf_byteen_in[i][3:0]),
|
|
.dout(buf_byteen[i]),
|
|
.en (buf_wr_en[i]),
|
|
.clk (lsu_bus_buf_c1_clk),
|
|
.*
|
|
);
|
|
rvdffe #(
|
|
.WIDTH(32)
|
|
) buf_dataff (
|
|
.din (buf_data_in[i][31:0]),
|
|
.dout(buf_data[i]),
|
|
.en (buf_data_en[i]),
|
|
.*
|
|
);
|
|
rvdffsc #(
|
|
.WIDTH(1)
|
|
) buf_errorff (
|
|
.din(1'b1),
|
|
.dout(buf_error[i]),
|
|
.en(buf_error_en[i]),
|
|
.clear(buf_rst[i]),
|
|
.clk(lsu_bus_buf_c1_clk),
|
|
.*
|
|
);
|
|
|
|
end
|
|
|
|
// buffer full logic
|
|
always_comb begin
|
|
buf_numvld_any[3:0] = ({1'b0,lsu_busreq_m} << ldst_dual_m) +
|
|
({1'b0,lsu_busreq_r} << ldst_dual_r) +
|
|
ibuf_valid;
|
|
buf_numvld_wrcmd_any[3:0] = 4'b0;
|
|
buf_numvld_cmd_any[3:0] = 4'b0;
|
|
buf_numvld_pend_any[3:0] = 4'b0;
|
|
any_done_wait_state = 1'b0;
|
|
for (int i = 0; i < DEPTH; i++) begin
|
|
buf_numvld_any[3:0] += {3'b0, (buf_state[i] != IDLE)};
|
|
buf_numvld_wrcmd_any[3:0] += {
|
|
3'b0, (buf_write[i] & (buf_state[i] == CMD) & ~buf_cmd_state_bus_en[i])
|
|
};
|
|
buf_numvld_cmd_any[3:0] += {3'b0, ((buf_state[i] == CMD) & ~buf_cmd_state_bus_en[i])};
|
|
buf_numvld_pend_any[3:0] += {
|
|
3'b0, ((buf_state[i] == WAIT) | ((buf_state[i] == CMD) & ~buf_cmd_state_bus_en[i]))
|
|
};
|
|
any_done_wait_state |= (buf_state[i] == DONE_WAIT);
|
|
end
|
|
end
|
|
|
|
assign lsu_bus_buffer_pend_any = (buf_numvld_pend_any != 0);
|
|
assign lsu_bus_buffer_full_any = (ldst_dual_d & dec_lsu_valid_raw_d) ? (buf_numvld_any[3:0] >= (DEPTH-1)) : (buf_numvld_any[3:0] == DEPTH);
|
|
assign lsu_bus_buffer_empty_any = ~(|buf_state[DEPTH-1:0]) & ~ibuf_valid & ~obuf_valid;
|
|
|
|
|
|
// Non blocking ports
|
|
assign lsu_nonblock_load_valid_m = lsu_busreq_m & lsu_pkt_m.valid & lsu_pkt_m.load & ~flush_m_up & ~ld_full_hit_m;
|
|
assign lsu_nonblock_load_tag_m[DEPTH_LOG2-1:0] = WrPtr0_m[DEPTH_LOG2-1:0];
|
|
assign lsu_nonblock_load_inv_r = lsu_nonblock_load_valid_r & ~lsu_commit_r;
|
|
assign lsu_nonblock_load_inv_tag_r[DEPTH_LOG2-1:0] = WrPtr0_r[DEPTH_LOG2-1:0]; // r tag needs to be accurate even if there is no invalidate
|
|
|
|
always_comb begin
|
|
lsu_nonblock_load_data_ready = '0;
|
|
lsu_nonblock_load_data_error = '0;
|
|
lsu_nonblock_load_data_tag[DEPTH_LOG2-1:0] = '0;
|
|
lsu_nonblock_load_data_lo[31:0] = '0;
|
|
lsu_nonblock_load_data_hi[31:0] = '0;
|
|
for (int i = 0; i < DEPTH; i++) begin
|
|
// Use buf_rst[i] instead of buf_state_en[i] for timing
|
|
lsu_nonblock_load_data_ready |= (buf_state[i] == DONE) & ~buf_write[i];
|
|
lsu_nonblock_load_data_error |= (buf_state[i] == DONE) & buf_error[i] & ~buf_write[i];
|
|
lsu_nonblock_load_data_tag[DEPTH_LOG2-1:0] |= DEPTH_LOG2'(i) & {DEPTH_LOG2{((buf_state[i] == DONE) & ~buf_write[i] & (~buf_dual[i] | ~buf_dualhi[i]))}};
|
|
lsu_nonblock_load_data_lo[31:0] |= buf_data[i][31:0] & {32{((buf_state[i] == DONE) & ~buf_write[i] & (~buf_dual[i] | ~buf_dualhi[i]))}};
|
|
lsu_nonblock_load_data_hi[31:0] |= buf_data[i][31:0] & {32{((buf_state[i] == DONE) & ~buf_write[i] & (buf_dual[i] & buf_dualhi[i]))}};
|
|
end
|
|
end
|
|
|
|
assign lsu_nonblock_addr_offset[1:0] = buf_addr[lsu_nonblock_load_data_tag][1:0];
|
|
assign lsu_nonblock_sz[1:0] = buf_sz[lsu_nonblock_load_data_tag][1:0];
|
|
assign lsu_nonblock_unsign = buf_unsign[lsu_nonblock_load_data_tag];
|
|
assign lsu_nonblock_data_unalgn[31:0] = 32'({lsu_nonblock_load_data_hi[31:0], lsu_nonblock_load_data_lo[31:0]} >> 8*lsu_nonblock_addr_offset[1:0]);
|
|
|
|
assign lsu_nonblock_load_data_valid = lsu_nonblock_load_data_ready & ~lsu_nonblock_load_data_error;
|
|
assign lsu_nonblock_load_data[31:0] = ({32{ lsu_nonblock_unsign & (lsu_nonblock_sz[1:0] == 2'b00)}} & {24'b0,lsu_nonblock_data_unalgn[7:0]}) |
|
|
({32{ lsu_nonblock_unsign & (lsu_nonblock_sz[1:0] == 2'b01)}} & {16'b0,lsu_nonblock_data_unalgn[15:0]}) |
|
|
({32{~lsu_nonblock_unsign & (lsu_nonblock_sz[1:0] == 2'b00)}} & {{24{lsu_nonblock_data_unalgn[7]}}, lsu_nonblock_data_unalgn[7:0]}) |
|
|
({32{~lsu_nonblock_unsign & (lsu_nonblock_sz[1:0] == 2'b01)}} & {{16{lsu_nonblock_data_unalgn[15]}},lsu_nonblock_data_unalgn[15:0]}) |
|
|
({32{(lsu_nonblock_sz[1:0] == 2'b10)}} & lsu_nonblock_data_unalgn[31:0]);
|
|
|
|
// Determine if there is a pending return to sideeffect load/store
|
|
always_comb begin
|
|
bus_sideeffect_pend = obuf_valid & obuf_sideeffect & dec_tlu_sideeffect_posted_disable;
|
|
for (int i = 0; i < DEPTH; i++) begin
|
|
bus_sideeffect_pend |= ((buf_state[i] == RESP) & buf_sideeffect[i] & dec_tlu_sideeffect_posted_disable);
|
|
end
|
|
end
|
|
|
|
// We have no ordering rules for AXI. Need to check outstanding trxns to same address for AXI
|
|
always_comb begin
|
|
bus_addr_match_pending = '0;
|
|
for (int i = 0; i < DEPTH; i++) begin
|
|
bus_addr_match_pending |= (obuf_valid & (obuf_addr[31:3] == buf_addr[i][31:3]) & (buf_state[i] == RESP) & ~((obuf_tag0 == (pt.LSU_BUS_TAG)'(i)) | (obuf_merge & (obuf_tag1 == (pt.LSU_BUS_TAG)'(i)))));
|
|
end
|
|
end
|
|
|
|
// Generic bus signals
|
|
assign bus_cmd_ready = obuf_write ? ((obuf_cmd_done | obuf_data_done) ? (obuf_cmd_done ? lsu_axi_wready : lsu_axi_awready) : (lsu_axi_awready & lsu_axi_wready)) : lsu_axi_arready;
|
|
assign bus_wcmd_sent = lsu_axi_awvalid & lsu_axi_awready;
|
|
assign bus_wdata_sent = lsu_axi_wvalid & lsu_axi_wready;
|
|
assign bus_cmd_sent = ((obuf_cmd_done | bus_wcmd_sent) & (obuf_data_done | bus_wdata_sent)) | (lsu_axi_arvalid & lsu_axi_arready);
|
|
|
|
assign bus_rsp_read = lsu_axi_rvalid & lsu_axi_rready;
|
|
assign bus_rsp_write = lsu_axi_bvalid & lsu_axi_bready;
|
|
assign bus_rsp_read_tag[pt.LSU_BUS_TAG-1:0] = lsu_axi_rid[pt.LSU_BUS_TAG-1:0];
|
|
assign bus_rsp_write_tag[pt.LSU_BUS_TAG-1:0] = lsu_axi_bid[pt.LSU_BUS_TAG-1:0];
|
|
assign bus_rsp_write_error = bus_rsp_write & (lsu_axi_bresp[1:0] != 2'b0);
|
|
assign bus_rsp_read_error = bus_rsp_read & (lsu_axi_rresp[1:0] != 2'b0);
|
|
assign bus_rsp_rdata[63:0] = lsu_axi_rdata[63:0];
|
|
|
|
// AXI command signals
|
|
assign lsu_axi_awvalid = obuf_valid & obuf_write & ~obuf_cmd_done & ~bus_addr_match_pending;
|
|
assign lsu_axi_awid[pt.LSU_BUS_TAG-1:0] = (pt.LSU_BUS_TAG)'(obuf_tag0);
|
|
assign lsu_axi_awaddr[31:0] = obuf_sideeffect ? obuf_addr[31:0] : {obuf_addr[31:3], 3'b0};
|
|
assign lsu_axi_awsize[2:0] = obuf_sideeffect ? {1'b0, obuf_sz[1:0]} : 3'b011;
|
|
assign lsu_axi_awprot[2:0] = 3'b001;
|
|
assign lsu_axi_awcache[3:0] = obuf_sideeffect ? 4'b0 : 4'b1111;
|
|
assign lsu_axi_awregion[3:0] = obuf_addr[31:28];
|
|
assign lsu_axi_awlen[7:0] = '0;
|
|
assign lsu_axi_awburst[1:0] = 2'b01;
|
|
assign lsu_axi_awqos[3:0] = '0;
|
|
assign lsu_axi_awlock = '0;
|
|
|
|
assign lsu_axi_wvalid = obuf_valid & obuf_write & ~obuf_data_done & ~bus_addr_match_pending;
|
|
assign lsu_axi_wstrb[7:0] = obuf_byteen[7:0] & {8{obuf_write}};
|
|
assign lsu_axi_wdata[63:0] = obuf_data[63:0];
|
|
assign lsu_axi_wlast = '1;
|
|
|
|
assign lsu_axi_arvalid = obuf_valid & ~obuf_write & ~obuf_nosend & ~bus_addr_match_pending;
|
|
assign lsu_axi_arid[pt.LSU_BUS_TAG-1:0] = (pt.LSU_BUS_TAG)'(obuf_tag0);
|
|
assign lsu_axi_araddr[31:0] = obuf_sideeffect ? obuf_addr[31:0] : {obuf_addr[31:3], 3'b0};
|
|
assign lsu_axi_arsize[2:0] = obuf_sideeffect ? {1'b0, obuf_sz[1:0]} : 3'b011;
|
|
assign lsu_axi_arprot[2:0] = 3'b001;
|
|
assign lsu_axi_arcache[3:0] = obuf_sideeffect ? 4'b0 : 4'b1111;
|
|
assign lsu_axi_arregion[3:0] = obuf_addr[31:28];
|
|
assign lsu_axi_arlen[7:0] = '0;
|
|
assign lsu_axi_arburst[1:0] = 2'b01;
|
|
assign lsu_axi_arqos[3:0] = '0;
|
|
assign lsu_axi_arlock = '0;
|
|
|
|
assign lsu_axi_bready = 1;
|
|
assign lsu_axi_rready = 1;
|
|
|
|
always_comb begin
|
|
lsu_imprecise_error_store_any = '0;
|
|
lsu_imprecise_error_store_tag = '0;
|
|
for (int i = 0; i < DEPTH; i++) begin
|
|
lsu_imprecise_error_store_any |= lsu_bus_clk_en_q & (buf_state[i] == DONE) & buf_error[i] & buf_write[i];
|
|
lsu_imprecise_error_store_tag |= DEPTH_LOG2'(i) & {DEPTH_LOG2{((buf_state[i] == DONE) & buf_error[i] & buf_write[i])}};
|
|
end
|
|
end
|
|
assign lsu_imprecise_error_load_any = lsu_nonblock_load_data_error & ~lsu_imprecise_error_store_any; // This is to make sure we send only one imprecise error for load/store
|
|
assign lsu_imprecise_error_addr_any[31:0] = lsu_imprecise_error_store_any ? buf_addr[lsu_imprecise_error_store_tag] : buf_addr[lsu_nonblock_load_data_tag];
|
|
|
|
// PMU signals
|
|
assign lsu_pmu_bus_trxn = (lsu_axi_awvalid & lsu_axi_awready) | (lsu_axi_wvalid & lsu_axi_wready) | (lsu_axi_arvalid & lsu_axi_arready);
|
|
assign lsu_pmu_bus_misaligned = lsu_busreq_r & ldst_dual_r & lsu_commit_r;
|
|
assign lsu_pmu_bus_error = lsu_imprecise_error_load_any | lsu_imprecise_error_store_any;
|
|
assign lsu_pmu_bus_busy = (lsu_axi_awvalid & ~lsu_axi_awready) | (lsu_axi_wvalid & ~lsu_axi_wready) | (lsu_axi_arvalid & ~lsu_axi_arready);
|
|
|
|
rvdff #(
|
|
.WIDTH(1)
|
|
) lsu_axi_awvalid_ff (
|
|
.din(lsu_axi_awvalid),
|
|
.dout(lsu_axi_awvalid_q),
|
|
.clk(lsu_busm_clk),
|
|
.*
|
|
);
|
|
rvdff #(
|
|
.WIDTH(1)
|
|
) lsu_axi_awready_ff (
|
|
.din(lsu_axi_awready),
|
|
.dout(lsu_axi_awready_q),
|
|
.clk(lsu_busm_clk),
|
|
.*
|
|
);
|
|
rvdff #(
|
|
.WIDTH(1)
|
|
) lsu_axi_wvalid_ff (
|
|
.din(lsu_axi_wvalid),
|
|
.dout(lsu_axi_wvalid_q),
|
|
.clk(lsu_busm_clk),
|
|
.*
|
|
);
|
|
rvdff #(
|
|
.WIDTH(1)
|
|
) lsu_axi_wready_ff (
|
|
.din(lsu_axi_wready),
|
|
.dout(lsu_axi_wready_q),
|
|
.clk(lsu_busm_clk),
|
|
.*
|
|
);
|
|
rvdff #(
|
|
.WIDTH(1)
|
|
) lsu_axi_arvalid_ff (
|
|
.din(lsu_axi_arvalid),
|
|
.dout(lsu_axi_arvalid_q),
|
|
.clk(lsu_busm_clk),
|
|
.*
|
|
);
|
|
rvdff #(
|
|
.WIDTH(1)
|
|
) lsu_axi_arready_ff (
|
|
.din(lsu_axi_arready),
|
|
.dout(lsu_axi_arready_q),
|
|
.clk(lsu_busm_clk),
|
|
.*
|
|
);
|
|
|
|
rvdff #(
|
|
.WIDTH(1)
|
|
) lsu_axi_bvalid_ff (
|
|
.din(lsu_axi_bvalid),
|
|
.dout(lsu_axi_bvalid_q),
|
|
.clk(lsu_busm_clk),
|
|
.*
|
|
);
|
|
rvdff #(
|
|
.WIDTH(1)
|
|
) lsu_axi_bready_ff (
|
|
.din(lsu_axi_bready),
|
|
.dout(lsu_axi_bready_q),
|
|
.clk(lsu_busm_clk),
|
|
.*
|
|
);
|
|
rvdff #(
|
|
.WIDTH(2)
|
|
) lsu_axi_bresp_ff (
|
|
.din(lsu_axi_bresp[1:0]),
|
|
.dout(lsu_axi_bresp_q[1:0]),
|
|
.clk(lsu_busm_clk),
|
|
.*
|
|
);
|
|
rvdff #(
|
|
.WIDTH(pt.LSU_BUS_TAG)
|
|
) lsu_axi_bid_ff (
|
|
.din(lsu_axi_bid[pt.LSU_BUS_TAG-1:0]),
|
|
.dout(lsu_axi_bid_q[pt.LSU_BUS_TAG-1:0]),
|
|
.clk(lsu_busm_clk),
|
|
.*
|
|
);
|
|
rvdffe #(
|
|
.WIDTH(64)
|
|
) lsu_axi_rdata_ff (
|
|
.din (lsu_axi_rdata[63:0]),
|
|
.dout(lsu_axi_rdata_q[63:0]),
|
|
.en ((lsu_axi_rvalid | clk_override) & lsu_bus_clk_en),
|
|
.*
|
|
);
|
|
|
|
rvdff #(
|
|
.WIDTH(1)
|
|
) lsu_axi_rvalid_ff (
|
|
.din(lsu_axi_rvalid),
|
|
.dout(lsu_axi_rvalid_q),
|
|
.clk(lsu_busm_clk),
|
|
.*
|
|
);
|
|
rvdff #(
|
|
.WIDTH(1)
|
|
) lsu_axi_rready_ff (
|
|
.din(lsu_axi_rready),
|
|
.dout(lsu_axi_rready_q),
|
|
.clk(lsu_busm_clk),
|
|
.*
|
|
);
|
|
rvdff #(
|
|
.WIDTH(2)
|
|
) lsu_axi_rresp_ff (
|
|
.din(lsu_axi_rresp[1:0]),
|
|
.dout(lsu_axi_rresp_q[1:0]),
|
|
.clk(lsu_busm_clk),
|
|
.*
|
|
);
|
|
rvdff #(
|
|
.WIDTH(pt.LSU_BUS_TAG)
|
|
) lsu_axi_rid_ff (
|
|
.din(lsu_axi_rid[pt.LSU_BUS_TAG-1:0]),
|
|
.dout(lsu_axi_rid_q[pt.LSU_BUS_TAG-1:0]),
|
|
.clk(lsu_busm_clk),
|
|
.*
|
|
);
|
|
|
|
rvdff #(
|
|
.WIDTH(DEPTH_LOG2)
|
|
) lsu_WrPtr0_rff (
|
|
.din (WrPtr0_m),
|
|
.dout(WrPtr0_r),
|
|
.clk (lsu_c2_r_clk),
|
|
.*
|
|
);
|
|
rvdff #(
|
|
.WIDTH(DEPTH_LOG2)
|
|
) lsu_WrPtr1_rff (
|
|
.din (WrPtr1_m),
|
|
.dout(WrPtr1_r),
|
|
.clk (lsu_c2_r_clk),
|
|
.*
|
|
);
|
|
|
|
rvdff #(
|
|
.WIDTH(1)
|
|
) lsu_busreq_rff (
|
|
.din (lsu_busreq_m & ~flush_r & ~ld_full_hit_m),
|
|
.dout(lsu_busreq_r),
|
|
.clk (lsu_c2_r_clk),
|
|
.*
|
|
);
|
|
rvdff #(
|
|
.WIDTH(1)
|
|
) lsu_nonblock_load_valid_rff (
|
|
.din (lsu_nonblock_load_valid_m),
|
|
.dout(lsu_nonblock_load_valid_r),
|
|
.clk (lsu_c2_r_clk),
|
|
.*
|
|
);
|
|
|
|
endmodule // el2_lsu_bus_buffer
|