From b931110f2d923161b252aae9b60bb8c5893aeb6a Mon Sep 17 00:00:00 2001 From: Ross Thompson Date: Wed, 25 Jan 2023 10:17:43 -0600 Subject: [PATCH] Renamed file missed from last commit. --- pipelined/src/generic/mem/ram2p1rwbe.sv | 72 +++++++++++++++++++++++++ 1 file changed, 72 insertions(+) create mode 100644 pipelined/src/generic/mem/ram2p1rwbe.sv diff --git a/pipelined/src/generic/mem/ram2p1rwbe.sv b/pipelined/src/generic/mem/ram2p1rwbe.sv new file mode 100644 index 00000000..49354075 --- /dev/null +++ b/pipelined/src/generic/mem/ram2p1rwbe.sv @@ -0,0 +1,72 @@ +/////////////////////////////////////////// +// 2 port sram. +// +// Written: ross1728@gmail.com May 3, 2021 +// Two port SRAM 1 read port and 1 write port. +// When clk rises Addr and LineWriteData are sampled. +// Following the clk edge read data is output from the sampled Addr. +// Write +// +// Purpose: Storage and read/write access to data cache data, tag valid, dirty, and replacement. +// +// A component of the CORE-V-WALLY configurable RISC-V project. +// +// Copyright (C) 2021-23 Harvey Mudd College & Oklahoma State University +// +// SPDX-License-Identifier: Apache-2.0 WITH SHL-2.1 +// +// Licensed under the Solderpad Hardware License v 2.1 (the “License”); you may not use this file +// except in compliance with the License, or, at your option, the Apache License version 2.0. You +// may obtain a copy of the License at +// +// https://solderpad.org/licenses/SHL-2.1/ +// +// Unless required by applicable law or agreed to in writing, any work 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. +//////////////////////////////////////////////////////////////////////////////////////////////// + +// WIDTH is number of bits in one "word" of the memory, DEPTH is number of such words + +`include "wally-config.vh" + +module ram2p1r1wbe #(parameter DEPTH=128, WIDTH=256) ( + input logic clk, + input logic ce1, ce2, + input logic [$clog2(DEPTH)-1:0] ra1, + input logic [WIDTH-1:0] wd2, + input logic [$clog2(DEPTH)-1:0] wa2, + input logic we2, + input logic [(WIDTH-1)/8:0] bwe2, + output logic [WIDTH-1:0] rd1 +); + + logic [WIDTH-1:0] mem[DEPTH-1:0]; + + // *************************************************************************** + // TRUE Smem macro + // *************************************************************************** + + // *************************************************************************** + // READ first SRAM model + // *************************************************************************** + integer i; + + // Read + always_ff @(posedge clk) + if(ce1) rd1 <= #1 mem[ra1]; + + // Write divided into part for bytes and part for extra msbs + if(WIDTH >= 8) + always @(posedge clk) + if (ce2 & we2) + for(i = 0; i < WIDTH/8; i++) + if(bwe2[i]) mem[wa2][i*8 +: 8] <= #1 wd2[i*8 +: 8]; + + if (WIDTH%8 != 0) // handle msbs if width not a multiple of 8 + always @(posedge clk) + if (ce2 & we2 & bwe2[WIDTH/8]) + mem[wa2][WIDTH-1:WIDTH-WIDTH%8] <= #1 wd2[WIDTH-1:WIDTH-WIDTH%8]; + +endmodule