cvw/pipelined/src/lsu/dtim.sv

53 lines
2.1 KiB
Systemverilog

///////////////////////////////////////////
// dtim.sv
//
// Written: Ross Thompson ross1728@gmail.com January 30, 2022
// Modified:
//
// Purpose: simple memory with bus or cache.
// A component of the Wally configurable RISC-V project.
//
// Copyright (C) 2021 Harvey Mudd College & Oklahoma State University
//
// MIT LICENSE
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
// BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
// OR OTHER DEALINGS IN THE SOFTWARE.
////////////////////////////////////////////////////////////////////////////////////////////////
`include "wally-config.vh"
module dtim(
input logic clk, reset,
input logic [1:0] MemRWM,
input logic [`PA_BITS-1:0] Adr,
input logic TrapM,
input logic [`LLEN-1:0] WriteDataM,
input logic [`LLEN/8-1:0] ByteMaskM,
output logic [`LLEN-1:0] ReadDataWordM
);
logic we;
localparam ADDR_WDITH = $clog2(`DTIM_RANGE/8);
localparam OFFSET = $clog2(`LLEN/8);
assign we = MemRWM[0] & ~TrapM; // have to ignore write if Trap.
bram1p1rw #(`LLEN/8, 8, ADDR_WDITH)
ram(.clk, .we, .bwe(ByteMaskM), .addr(Adr[ADDR_WDITH+OFFSET-1:OFFSET]), .dout(ReadDataWordM), .din(WriteDataM));
endmodule