quasar/design/target/scala-2.12/classes/vsrc/lsu_dccm_mem.sv

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// SPDX-License-Identifier: Apache-2.0
// Copyright 2020 Western Digital Corporation or it's affiliates.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//********************************************************************************
// $Id$
//
//
// Owner:
// Function: DCCM for LSU pipe
// Comments: Single ported memory
//
//
// DC1 -> DC2 -> DC3 -> DC4 (Commit)
//
// //********************************************************************************
module lsu_dccm_mem
#(
parameter DCCM_BYTE_WIDTH,
parameter DCCM_BITS,
parameter DCCM_NUM_BANKS,
parameter DCCM_BANK_BITS,
parameter DCCM_SIZE,
parameter DCCM_FDATA_WIDTH )(
input logic clk, // clock
input logic rst_l,
input logic clk_override, // clock override
input logic dccm_wren, // write enable
input logic dccm_rden, // read enable
input logic [DCCM_BITS-1:0] dccm_wr_addr_lo, // write address
input logic [DCCM_BITS-1:0] dccm_wr_addr_hi, // write address
input logic [DCCM_BITS-1:0] dccm_rd_addr_lo, // read address
input logic [DCCM_BITS-1:0] dccm_rd_addr_hi, // read address for the upper bank in case of a misaligned access
input logic [DCCM_FDATA_WIDTH-1:0] dccm_wr_data_lo, // write data
input logic [DCCM_FDATA_WIDTH-1:0] dccm_wr_data_hi, // write data
output logic [DCCM_FDATA_WIDTH-1:0] dccm_rd_data_lo, // read data from the lo bank
output logic [DCCM_FDATA_WIDTH-1:0] dccm_rd_data_hi, // read data from the hi bank
input logic scan_mode
);
localparam DCCM_WIDTH_BITS = $clog2(DCCM_BYTE_WIDTH);
localparam DCCM_INDEX_BITS = (DCCM_BITS - DCCM_BANK_BITS - DCCM_WIDTH_BITS);
localparam DCCM_INDEX_DEPTH = ((DCCM_SIZE)*1024)/((DCCM_BYTE_WIDTH)*(DCCM_NUM_BANKS)); // Depth of memory bank
logic [DCCM_NUM_BANKS-1:0] wren_bank;
logic [DCCM_NUM_BANKS-1:0] rden_bank;
logic [DCCM_NUM_BANKS-1:0] [DCCM_BITS-1:(DCCM_BANK_BITS+2)] addr_bank;
logic [DCCM_BITS-1:(DCCM_BANK_BITS+DCCM_WIDTH_BITS)] rd_addr_even, rd_addr_odd;
logic rd_unaligned, wr_unaligned;
logic [DCCM_NUM_BANKS-1:0] [DCCM_FDATA_WIDTH-1:0] dccm_bank_dout;
logic [DCCM_FDATA_WIDTH-1:0] wrdata;
logic [DCCM_NUM_BANKS-1:0][DCCM_FDATA_WIDTH-1:0] wr_data_bank;
logic [(DCCM_WIDTH_BITS+DCCM_BANK_BITS-1):DCCM_WIDTH_BITS] dccm_rd_addr_lo_q;
logic [(DCCM_WIDTH_BITS+DCCM_BANK_BITS-1):DCCM_WIDTH_BITS] dccm_rd_addr_hi_q;
logic [DCCM_NUM_BANKS-1:0] dccm_clken;
assign rd_unaligned = (dccm_rd_addr_lo[DCCM_WIDTH_BITS+:DCCM_BANK_BITS] != dccm_rd_addr_hi[DCCM_WIDTH_BITS+:DCCM_BANK_BITS]);
assign wr_unaligned = (dccm_wr_addr_lo[DCCM_WIDTH_BITS+:DCCM_BANK_BITS] != dccm_wr_addr_hi[DCCM_WIDTH_BITS+:DCCM_BANK_BITS]);
// Align the read data
assign dccm_rd_data_lo[DCCM_FDATA_WIDTH-1:0] = dccm_bank_dout[dccm_rd_addr_lo_q[DCCM_WIDTH_BITS+:DCCM_BANK_BITS]][DCCM_FDATA_WIDTH-1:0];
assign dccm_rd_data_hi[DCCM_FDATA_WIDTH-1:0] = dccm_bank_dout[dccm_rd_addr_hi_q[DCCM_WIDTH_BITS+:DCCM_BANK_BITS]][DCCM_FDATA_WIDTH-1:0];
// Generate even/odd address
// 8 Banks, 16KB each (2048 x 72)
for (genvar i=0; i<32'(DCCM_NUM_BANKS); i++) begin: mem_bank
assign wren_bank[i] = dccm_wren & ((dccm_wr_addr_hi[2+:DCCM_BANK_BITS] == i) | (dccm_wr_addr_lo[2+:DCCM_BANK_BITS] == i));
assign rden_bank[i] = dccm_rden & ((dccm_rd_addr_hi[2+:DCCM_BANK_BITS] == i) | (dccm_rd_addr_lo[2+:DCCM_BANK_BITS] == i));
assign addr_bank[i][(DCCM_BANK_BITS+DCCM_WIDTH_BITS)+:DCCM_INDEX_BITS] = wren_bank[i] ? (((dccm_wr_addr_hi[2+:DCCM_BANK_BITS] == i) & wr_unaligned) ?
dccm_wr_addr_hi[(DCCM_BANK_BITS+DCCM_WIDTH_BITS)+:DCCM_INDEX_BITS] :
dccm_wr_addr_lo[(DCCM_BANK_BITS+DCCM_WIDTH_BITS)+:DCCM_INDEX_BITS]) :
(((dccm_rd_addr_hi[2+:DCCM_BANK_BITS] == i) & rd_unaligned) ?
dccm_rd_addr_hi[(DCCM_BANK_BITS+DCCM_WIDTH_BITS)+:DCCM_INDEX_BITS] :
dccm_rd_addr_lo[(DCCM_BANK_BITS+DCCM_WIDTH_BITS)+:DCCM_INDEX_BITS]);
assign wr_data_bank[i] = ((dccm_wr_addr_hi[2+:DCCM_BANK_BITS] == i) & wr_unaligned) ? dccm_wr_data_hi[DCCM_FDATA_WIDTH-1:0] : dccm_wr_data_lo[DCCM_FDATA_WIDTH-1:0];
// clock gating section
assign dccm_clken[i] = (wren_bank[i] | rden_bank[i] | clk_override) ;
// end clock gating section
`ifdef VERILATOR
el2_ram #(DCCM_INDEX_DEPTH,39) ram (
// Primary ports
.ME(dccm_clken[i]),
.CLK(clk),
.WE(wren_bank[i]),
.ADR(addr_bank[i]),
.D(wr_data_bank[i][DCCM_FDATA_WIDTH-1:0]),
.Q(dccm_bank_dout[i][DCCM_FDATA_WIDTH-1:0]),
.*
);
`else
if (DCCM_INDEX_DEPTH == 32768) begin : dccm
ram_32768x39 dccm_bank (
// Primary ports
.ME(dccm_clken[i]),
.CLK(clk),
.WE(wren_bank[i]),
.ADR(addr_bank[i]),
.D(wr_data_bank[i][DCCM_FDATA_WIDTH-1:0]),
.Q(dccm_bank_dout[i][DCCM_FDATA_WIDTH-1:0]),
.*
);
end
else if (DCCM_INDEX_DEPTH == 16384) begin : dccm
ram_16384x39 dccm_bank (
// Primary ports
.ME(dccm_clken[i]),
.CLK(clk),
.WE(wren_bank[i]),
.ADR(addr_bank[i]),
.D(wr_data_bank[i][DCCM_FDATA_WIDTH-1:0]),
.Q(dccm_bank_dout[i][DCCM_FDATA_WIDTH-1:0]),
.*
);
end
else if (DCCM_INDEX_DEPTH == 8192) begin : dccm
ram_8192x39 dccm_bank (
// Primary ports
.ME(dccm_clken[i]),
.CLK(clk),
.WE(wren_bank[i]),
.ADR(addr_bank[i]),
.D(wr_data_bank[i][DCCM_FDATA_WIDTH-1:0]),
.Q(dccm_bank_dout[i][DCCM_FDATA_WIDTH-1:0]),
.*
);
end
else if (DCCM_INDEX_DEPTH == 4096) begin : dccm
ram_4096x39 dccm_bank (
// Primary ports
.ME(dccm_clken[i]),
.CLK(clk),
.WE(wren_bank[i]),
.ADR(addr_bank[i]),
.D(wr_data_bank[i][DCCM_FDATA_WIDTH-1:0]),
.Q(dccm_bank_dout[i][DCCM_FDATA_WIDTH-1:0]),
.*
);
end
else if (DCCM_INDEX_DEPTH == 3072) begin : dccm
ram_3072x39 dccm_bank (
// Primary ports
.ME(dccm_clken[i]),
.CLK(clk),
.WE(wren_bank[i]),
.ADR(addr_bank[i]),
.D(wr_data_bank[i][DCCM_FDATA_WIDTH-1:0]),
.Q(dccm_bank_dout[i][DCCM_FDATA_WIDTH-1:0]),
.*
);
end
else if (DCCM_INDEX_DEPTH == 2048) begin : dccm
ram_2048x39 dccm_bank (
// Primary ports
.ME(dccm_clken[i]),
.CLK(clk),
.WE(wren_bank[i]),
.ADR(addr_bank[i]),
.D(wr_data_bank[i][DCCM_FDATA_WIDTH-1:0]),
.Q(dccm_bank_dout[i][DCCM_FDATA_WIDTH-1:0]),
.*
);
end
else if (DCCM_INDEX_DEPTH == 1024) begin : dccm
ram_1024x39 dccm_bank (
// Primary ports
.ME(dccm_clken[i]),
.CLK(clk),
.WE(wren_bank[i]),
.ADR(addr_bank[i]),
.D(wr_data_bank[i][DCCM_FDATA_WIDTH-1:0]),
.Q(dccm_bank_dout[i][DCCM_FDATA_WIDTH-1:0]),
.*
);
end
else if (DCCM_INDEX_DEPTH == 512) begin : dccm
ram_512x39 dccm_bank (
// Primary ports
.ME(dccm_clken[i]),
.CLK(clk),
.WE(wren_bank[i]),
.ADR(addr_bank[i]),
.D(wr_data_bank[i][DCCM_FDATA_WIDTH-1:0]),
.Q(dccm_bank_dout[i][DCCM_FDATA_WIDTH-1:0]),
.*
);
end
else if (DCCM_INDEX_DEPTH == 256) begin : dccm
ram_256x39 dccm_bank (
// Primary ports
.ME(dccm_clken[i]),
.CLK(clk),
.WE(wren_bank[i]),
.ADR(addr_bank[i]),
.D(wr_data_bank[i][DCCM_FDATA_WIDTH-1:0]),
.Q(dccm_bank_dout[i][DCCM_FDATA_WIDTH-1:0]),
.*
);
end
`endif // VERILATOR
end : mem_bank
// Flops
rvdffs #(DCCM_BANK_BITS) rd_addr_lo_ff (.*, .din(dccm_rd_addr_lo[DCCM_WIDTH_BITS+:DCCM_BANK_BITS]), .dout(dccm_rd_addr_lo_q[DCCM_WIDTH_BITS+:DCCM_BANK_BITS]), .en(1'b1));
rvdffs #(DCCM_BANK_BITS) rd_addr_hi_ff (.*, .din(dccm_rd_addr_hi[DCCM_WIDTH_BITS+:DCCM_BANK_BITS]), .dout(dccm_rd_addr_hi_q[DCCM_WIDTH_BITS+:DCCM_BANK_BITS]), .en(1'b1));
`undef EL2_LOCAL_DCCM_RAM_TEST_PORTS
endmodule // el2_lsu_dccm_mem