334 lines
17 KiB
Systemverilog
334 lines
17 KiB
Systemverilog
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//********************************************************************************
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// SPDX-License-Identifier: Apache-2.0
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// Copyright 2020 Western Digital Corporation or it's 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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//********************************************************************************
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// Icache closely coupled memory --- ICCM
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//********************************************************************************
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module el2_ifu_iccm_mem
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#(
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parameter ICCM_BITS,
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parameter ICCM_BANK_INDEX_LO,
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parameter ICCM_INDEX_BITS,
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parameter ICCM_BANK_HI,
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parameter ICCM_NUM_BANKS,
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parameter ICCM_BANK_BITS )(
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input logic clk,
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input logic rst_l,
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input logic clk_override,
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input logic iccm_wren,
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input logic iccm_rden,
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input logic [ICCM_BITS-1:1] iccm_rw_addr,
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input logic iccm_buf_correct_ecc, // ICCM is doing a single bit error correct cycle
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input logic iccm_correction_state, // We are under a correction - This is needed to guard replacements when hit
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input logic [2:0] iccm_wr_size,
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input logic [77:0] iccm_wr_data,
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output logic [63:0] iccm_rd_data,
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output logic [77:0] iccm_rd_data_ecc,
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input logic scan_mode
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);
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logic [ICCM_NUM_BANKS-1:0] wren_bank;
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logic [ICCM_NUM_BANKS-1:0] rden_bank;
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logic [ICCM_NUM_BANKS-1:0] iccm_clken;
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logic [ICCM_NUM_BANKS-1:0] [ICCM_BITS-1:ICCM_BANK_INDEX_LO] addr_bank;
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logic [ICCM_NUM_BANKS-1:0] [38:0] iccm_bank_dout, iccm_bank_dout_fn;
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logic [ICCM_NUM_BANKS-1:0] [38:0] iccm_bank_wr_data;
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logic [ICCM_BITS-1:1] addr_bank_inc;
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logic [ICCM_BANK_HI : 2] iccm_rd_addr_hi_q;
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logic [ICCM_BANK_HI : 1] iccm_rd_addr_lo_q;
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logic [63:0] iccm_rd_data_pre;
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logic [63:0] iccm_data;
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logic [1:0] addr_incr;
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logic [ICCM_NUM_BANKS-1:0] [38:0] iccm_bank_wr_data_vec;
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// logic to handle hard persisten faults
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logic [1:0] [ICCM_BITS-1:2] redundant_address;
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logic [1:0] [38:0] redundant_data;
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logic [1:0] redundant_valid;
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logic [ICCM_NUM_BANKS-1:0] sel_red1, sel_red0, sel_red1_q, sel_red0_q;
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logic [38:0] redundant_data0_in, redundant_data1_in;
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logic redundant_lru, redundant_lru_in, redundant_lru_en;
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logic redundant_data0_en;
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logic redundant_data1_en;
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logic r0_addr_en, r1_addr_en;
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assign addr_incr[1:0] = (iccm_wr_size[1:0] == 2'b11) ? 2'b10: 2'b01;
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assign addr_bank_inc[ICCM_BITS-1 : 1] = iccm_rw_addr[ICCM_BITS-1 : 1] + addr_incr[1:0];
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for (genvar i=0; i<32'(ICCM_NUM_BANKS)/2; i++) begin: mem_bank_data
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assign iccm_bank_wr_data_vec[(2*i)] = iccm_wr_data[38:0];
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assign iccm_bank_wr_data_vec[(2*i)+1] = iccm_wr_data[77:39];
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end
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for (genvar i=0; i<32'(ICCM_NUM_BANKS); i++) begin: mem_bank
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assign wren_bank[i] = iccm_wren & ((iccm_rw_addr[ICCM_BANK_HI:2] == i) | (addr_bank_inc[ICCM_BANK_HI:2] == i));
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assign iccm_bank_wr_data[i] = iccm_bank_wr_data_vec[i];
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assign rden_bank[i] = iccm_rden & ( (iccm_rw_addr[ICCM_BANK_HI:2] == i) | (addr_bank_inc[ICCM_BANK_HI:2] == i));
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assign iccm_clken[i] = wren_bank[i] | rden_bank[i] | clk_override;
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assign addr_bank[i][ICCM_BITS-1 : ICCM_BANK_INDEX_LO] = wren_bank[i] ? iccm_rw_addr[ICCM_BITS-1 : ICCM_BANK_INDEX_LO] :
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((addr_bank_inc[ICCM_BANK_HI:2] == i) ?
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addr_bank_inc[ICCM_BITS-1 : ICCM_BANK_INDEX_LO] :
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iccm_rw_addr[ICCM_BITS-1 : ICCM_BANK_INDEX_LO]);
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`ifdef VERILATOR
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el2_ram #(.depth(1<<ICCM_INDEX_BITS), .width(39)) iccm_bank (
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// Primary ports
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.ME(iccm_clken[i]),
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.CLK(clk),
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.WE(wren_bank[i]),
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.ADR(addr_bank[i]),
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.D(iccm_bank_wr_data[i][38:0]),
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.Q(iccm_bank_dout[i][38:0])
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);
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`else
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if (ICCM_INDEX_BITS == 6 ) begin : iccm
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ram_64x39 iccm_bank (
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// Primary ports
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.CLK(clk),
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.ME(iccm_clken[i]),
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.WE(wren_bank[i]),
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.ADR(addr_bank[i]),
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.D(iccm_bank_wr_data[i][38:0]),
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.Q(iccm_bank_dout[i][38:0])
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);
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end // block: iccm
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else if (ICCM_INDEX_BITS == 7 ) begin : iccm
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ram_128x39 iccm_bank (
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// Primary ports
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.CLK(clk),
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.ME(iccm_clken[i]),
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.WE(wren_bank[i]),
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.ADR(addr_bank[i]),
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.D(iccm_bank_wr_data[i][38:0]),
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.Q(iccm_bank_dout[i][38:0])
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);
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end // block: iccm
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else if (ICCM_INDEX_BITS == 8 ) begin : iccm
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ram_256x39 iccm_bank (
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// Primary ports
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.CLK(clk),
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.ME(iccm_clken[i]),
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.WE(wren_bank[i]),
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.ADR(addr_bank[i]),
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.D(iccm_bank_wr_data[i][38:0]),
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.Q(iccm_bank_dout[i][38:0])
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);
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end // block: iccm
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else if (ICCM_INDEX_BITS == 9 ) begin : iccm
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ram_512x39 iccm_bank (
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// Primary ports
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.CLK(clk),
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.ME(iccm_clken[i]),
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.WE(wren_bank[i]),
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.ADR(addr_bank[i]),
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.D(iccm_bank_wr_data[i][38:0]),
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.Q(iccm_bank_dout[i][38:0])
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);
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end // block: iccm
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else if (ICCM_INDEX_BITS == 10 ) begin : iccm
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ram_1024x39 iccm_bank (
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// Primary ports
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.CLK(clk),
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.ME(iccm_clken[i]),
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.WE(wren_bank[i]),
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.ADR(addr_bank[i]),
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.D(iccm_bank_wr_data[i][38:0]),
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.Q(iccm_bank_dout[i][38:0])
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);
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end // block: iccm
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else if (ICCM_INDEX_BITS == 11 ) begin : iccm
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ram_2048x39 iccm_bank (
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// Primary ports
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.CLK(clk),
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.ME(iccm_clken[i]),
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.WE(wren_bank[i]),
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.ADR(addr_bank[i]),
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.D(iccm_bank_wr_data[i][38:0]),
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.Q(iccm_bank_dout[i][38:0])
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);
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end // block: iccm
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else if (ICCM_INDEX_BITS == 12 ) begin : iccm
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ram_4096x39 iccm_bank (
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// Primary ports
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.CLK(clk),
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.ME(iccm_clken[i]),
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.WE(wren_bank[i]),
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.ADR(addr_bank[i]),
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.D(iccm_bank_wr_data[i][38:0]),
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.Q(iccm_bank_dout[i][38:0])
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);
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end // block: iccm
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else if (ICCM_INDEX_BITS == 13 ) begin : iccm
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ram_8192x39 iccm_bank (
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// Primary ports
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.CLK(clk),
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.ME(iccm_clken[i]),
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.WE(wren_bank[i]),
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.ADR(addr_bank[i]),
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.D(iccm_bank_wr_data[i][38:0]),
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.Q(iccm_bank_dout[i][38:0])
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);
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end // block: iccm
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else if (ICCM_INDEX_BITS == 14 ) begin : iccm
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ram_16384x39 iccm_bank (
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// Primary ports
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.CLK(clk),
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.ME(iccm_clken[i]),
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.WE(wren_bank[i]),
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.ADR(addr_bank[i]),
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.D(iccm_bank_wr_data[i][38:0]),
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.Q(iccm_bank_dout[i][38:0])
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);
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end // block: iccm
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else begin : iccm
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ram_32768x39 iccm_bank (
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// Primary ports
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.CLK(clk),
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.ME(iccm_clken[i]),
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.WE(wren_bank[i]),
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.ADR(addr_bank[i]),
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.D(iccm_bank_wr_data[i][38:0]),
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.Q(iccm_bank_dout[i][38:0])
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);
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end // block: iccm
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`endif
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// match the redundant rows
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assign sel_red1[i] = (redundant_valid[1] & (((iccm_rw_addr[ICCM_BITS-1:2] == redundant_address[1][ICCM_BITS-1:2]) & (iccm_rw_addr[3:2] == i)) |
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((addr_bank_inc[ICCM_BITS-1:2]== redundant_address[1][ICCM_BITS-1:2]) & (addr_bank_inc[3:2] == i))));
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assign sel_red0[i] = (redundant_valid[0] & (((iccm_rw_addr[ICCM_BITS-1:2] == redundant_address[0][ICCM_BITS-1:2]) & (iccm_rw_addr[3:2] == i)) |
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((addr_bank_inc[ICCM_BITS-1:2]== redundant_address[0][ICCM_BITS-1:2]) & (addr_bank_inc[3:2] == i))));
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rvdff #(1) selred0 (.*,
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.clk(clk),
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.din(sel_red0[i]),
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.dout(sel_red0_q[i]));
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rvdff #(1) selred1 (.*,
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.clk(clk),
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.din(sel_red1[i]),
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.dout(sel_red1_q[i]));
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// muxing out the memory data with the redundant data if the address matches
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assign iccm_bank_dout_fn[i][38:0] = ({39{sel_red1_q[i]}} & redundant_data[1][38:0]) |
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({39{sel_red0_q[i]}} & redundant_data[0][38:0]) |
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({39{~sel_red0_q[i] & ~sel_red1_q[i]}} & iccm_bank_dout[i][38:0]);
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end : mem_bank
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// This section does the redundancy for tolerating single bit errors
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// 2x 39 bit data values with address[hi:2] and a valid bit is needed to CAM and sub out the reads/writes to the particular locations
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// Also a LRU flop is kept to decide which of the redundant element to replace.
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assign r0_addr_en = ~redundant_lru & iccm_buf_correct_ecc;
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assign r1_addr_en = redundant_lru & iccm_buf_correct_ecc;
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assign redundant_lru_en = iccm_buf_correct_ecc | (((|sel_red0[ICCM_NUM_BANKS-1:0]) | (|sel_red1[ICCM_NUM_BANKS-1:0])) & iccm_rden & iccm_correction_state);
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assign redundant_lru_in = iccm_buf_correct_ecc ? ~redundant_lru : (|sel_red0[ICCM_NUM_BANKS-1:0]) ? 1'b1 : 1'b0;
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rvdffs #() red_lru (.*, // LRU flop for the redundant replacements
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.clk(clk),
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.en(redundant_lru_en),
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.din(redundant_lru_in),
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.dout(redundant_lru));
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rvdffs #(ICCM_BITS-2) r0_address (.*, // Redundant Row 0 address
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.clk(clk),
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.en(r0_addr_en),
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.din(iccm_rw_addr[ICCM_BITS-1:2]),
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.dout(redundant_address[0][ICCM_BITS-1:2]));
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rvdffs #(ICCM_BITS-2) r1_address (.*, // Redundant Row 0 address
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.clk(clk),
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.en(r1_addr_en),
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.din(iccm_rw_addr[ICCM_BITS-1:2]),
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.dout(redundant_address[1][ICCM_BITS-1:2]));
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rvdffs #(1) r0_valid (.*,
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.clk(clk), // Redundant Row 0 Valid
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.en(r0_addr_en),
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.din(1'b1),
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.dout(redundant_valid[0]));
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rvdffs #(1) r1_valid (.*, // Redundant Row 1 Valid
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.clk(clk),
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.en(r1_addr_en),
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.din(1'b1),
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.dout(redundant_valid[1]));
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// We will have to update the Redundant copies in addition to the memory on subsequent writes to this memory location.
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// The data gets updated on : 1) correction cycle, 2) Future writes - this could be W writes from DMA ( match up till addr[2]) or DW writes ( match till address[3])
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// The data to pick also depends on the current address[2], size and the addr[2] stored in the address field of the redundant flop. Correction cycle is always W write and the data is splat on both legs, so choosing lower Word
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assign redundant_data0_en = ((iccm_rw_addr[ICCM_BITS-1:3] == redundant_address[0][ICCM_BITS-1:3]) & ((iccm_rw_addr[2] == redundant_address[0][2]) | (iccm_wr_size[1:0] == 2'b11)) & redundant_valid[0] & iccm_wren) |
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(~redundant_lru & iccm_buf_correct_ecc);
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assign redundant_data0_in[38:0] = (((iccm_rw_addr[2] == redundant_address[0][2]) & iccm_rw_addr[2]) | (redundant_address[0][2] & (iccm_wr_size[1:0] == 2'b11))) ? iccm_wr_data[77:39] : iccm_wr_data[38:0];
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rvdffs #(39) r0_data (.*, // Redundant Row 1 data
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.clk(clk),
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.en(redundant_data0_en),
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.din(redundant_data0_in[38:0]),
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.dout(redundant_data[0][38:0]));
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assign redundant_data1_en = ((iccm_rw_addr[ICCM_BITS-1:3] == redundant_address[1][ICCM_BITS-1:3]) & ((iccm_rw_addr[2] == redundant_address[1][2]) | (iccm_wr_size[1:0] == 2'b11)) & redundant_valid[1] & iccm_wren) |
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(redundant_lru & iccm_buf_correct_ecc);
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assign redundant_data1_in[38:0] = (((iccm_rw_addr[2] == redundant_address[1][2]) & iccm_rw_addr[2]) | (redundant_address[1][2] & (iccm_wr_size[1:0] == 2'b11))) ? iccm_wr_data[77:39] : iccm_wr_data[38:0];
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rvdffs #(39) r1_data (.*, // Redundant Row 1 data
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.clk(clk),
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.en(redundant_data1_en),
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.din(redundant_data1_in[38:0]),
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.dout(redundant_data[1][38:0]));
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rvdffs #(ICCM_BANK_HI) rd_addr_lo_ff (.*, .din(iccm_rw_addr [ICCM_BANK_HI:1]), .dout(iccm_rd_addr_lo_q[ICCM_BANK_HI:1]), .en(1'b1)); // bit 0 of address is always 0
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rvdffs #(ICCM_BANK_BITS) rd_addr_hi_ff (.*, .din(addr_bank_inc[ICCM_BANK_HI:2]), .dout(iccm_rd_addr_hi_q[ICCM_BANK_HI:2]), .en(1'b1));
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assign iccm_rd_data_pre[63:0] = {iccm_bank_dout_fn[iccm_rd_addr_hi_q][31:0], iccm_bank_dout_fn[iccm_rd_addr_lo_q[ICCM_BANK_HI:2]][31:0]};
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assign iccm_data[63:0] = 64'({16'b0, (iccm_rd_data_pre[63:0] >> (16*iccm_rd_addr_lo_q[1]))});
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assign iccm_rd_data[63:0] = {iccm_data[63:0]};
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assign iccm_rd_data_ecc[77:0] = {iccm_bank_dout_fn[iccm_rd_addr_hi_q][38:0], iccm_bank_dout_fn[iccm_rd_addr_lo_q[ICCM_BANK_HI:2]][38:0]};
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endmodule // el2_ifu_iccm_mem
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