Renamed SRAM2P1R1W to lower case

pipelined/src/generic/mem/sram2p1r1w.sv

@@ -0,0 +1,88 @@
+///////////////////////////////////////////
+// sram2p1r1w
+//
+// Written: Ross Thomposn
+// Email: ross1728@gmail.com
+// Created: February 14, 2021
+// Modified: 
+//
+// Purpose: Behavioral model of two port SRAM.  While this is synthesizable it will produce a flip flop based memory which
+//          behaves with the timing of an SRAM typical of GF 14nm, 32nm, and 45nm.
+//          
+// 
+// to preload this memory we can use the following command
+// in modelsim's do file.
+// mem load -infile <relative path to the text file > -format <bin|hex> <hierarchy to the memory.>
+// example
+// mem load -infile twoBitPredictor.txt -format bin testbench/dut/core/ifu/bpred/DirPredictor/memory/memory
+//
+// 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 sram2p1r1w
+  #(parameter int DEPTH = 10,
+    parameter int WIDTH = 2
+    )
+
+  (input logic              clk,
+   input logic              reset,
+  
+   // port 1 is read only
+   input logic [DEPTH-1:0]  RA1,
+   output logic [WIDTH-1:0] RD1,
+   input logic              REN1,
+  
+   // port 2 is write only
+   input logic [DEPTH-1:0]  WA1,
+   input logic [WIDTH-1:0]  WD1,
+   input logic              WEN1,
+   input logic [WIDTH-1:0]  BitWEN1
+);
+  
+
+  logic [DEPTH-1:0]         RA1Q, WA1Q;
+  logic                     WEN1Q;
+  logic [WIDTH-1:0]         WD1Q;
+
+  logic [WIDTH-1:0]         mem[2**DEPTH-1:0];
+  logic [WIDTH-1:0]         bwe;
+
+  
+  // SRAMs address busses are always registered first
+  flopenr #(DEPTH) RA1Reg(clk, reset, REN1, RA1, RA1Q);
+  flopenr #(DEPTH) WA1Reg(clk, reset, REN1, WA1, WA1Q);
+  flopr   #(1)     WEN1Reg(clk, reset, WEN1, WEN1Q);
+  flopenr #(WIDTH) WD1Reg(clk, reset, REN1, WD1, WD1Q);
+
+  // read port
+  assign RD1 = mem[RA1Q];
+  
+  // write port
+  assign bwe = {WIDTH{WEN1Q}} & BitWEN1;
+  always_ff @(posedge clk)
+    mem[WA1Q] <= WD1Q & bwe | mem[WA1Q] & ~bwe;
+ 
+endmodule  
+
+