cores-swerv-el2/design/dec/el2_dec_gpr_ctl.sv

96 lines
3.1 KiB
Systemverilog

// SPDX-License-Identifier: Apache-2.0
// Copyright 2020 Western Digital Corporation or its 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.
module el2_dec_gpr_ctl
import el2_pkg::*;
#(
`include "el2_param.vh"
) (
input logic [4:0] raddr0, // logical read addresses
input logic [4:0] raddr1,
input logic wen0, // write enable
input logic [4:0] waddr0, // write address
input logic [31:0] wd0, // write data
input logic wen1, // write enable
input logic [4:0] waddr1, // write address
input logic [31:0] wd1, // write data
input logic wen2, // write enable
input logic [4:0] waddr2, // write address
input logic [31:0] wd2, // write data
input logic clk,
input logic rst_l,
output logic [31:0] rd0, // read data
output logic [31:0] rd1,
input logic scan_mode
);
logic [31:1] [31:0] gpr_out; // 31 x 32 bit GPRs
logic [31:1] [31:0] gpr_in;
logic [31:1] w0v,w1v,w2v;
logic [31:1] gpr_wr_en;
// GPR Write Enables
assign gpr_wr_en[31:1] = (w0v[31:1] | w1v[31:1] | w2v[31:1]);
for ( genvar j=1; j<32; j++ ) begin : gpr
rvdffe #(32) gprff (.*, .en(gpr_wr_en[j]), .din(gpr_in[j][31:0]), .dout(gpr_out[j][31:0]));
end : gpr
// the read out
always_comb begin
rd0[31:0] = 32'b0;
rd1[31:0] = 32'b0;
w0v[31:1] = 31'b0;
w1v[31:1] = 31'b0;
w2v[31:1] = 31'b0;
gpr_in[31:1] = '0;
// GPR Read logic
for (int j=1; j<32; j++ ) begin
rd0[31:0] |= ({32{(raddr0[4:0]== 5'(j))}} & gpr_out[j][31:0]);
rd1[31:0] |= ({32{(raddr1[4:0]== 5'(j))}} & gpr_out[j][31:0]);
end
// GPR Write logic
for (int j=1; j<32; j++ ) begin
w0v[j] = wen0 & (waddr0[4:0]== 5'(j) );
w1v[j] = wen1 & (waddr1[4:0]== 5'(j) );
w2v[j] = wen2 & (waddr2[4:0]== 5'(j) );
gpr_in[j] = ({32{w0v[j]}} & wd0[31:0]) |
({32{w1v[j]}} & wd1[31:0]) |
({32{w2v[j]}} & wd2[31:0]);
end
end // always_comb begin
`ifdef RV_ASSERT_ON
logic write_collision_unused;
assign write_collision_unused = ( (w0v[31:1] == w1v[31:1]) & wen0 & wen1 ) |
( (w0v[31:1] == w2v[31:1]) & wen0 & wen2 ) |
( (w1v[31:1] == w2v[31:1]) & wen1 & wen2 );
// asserting that no 2 ports will write to the same gpr simultaneously
assert_multiple_wen_to_same_gpr: assert #0 (~( write_collision_unused ) );
`endif
endmodule