forked from Github_Repos/cvw
54 lines
2.1 KiB
Systemverilog
54 lines
2.1 KiB
Systemverilog
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///////////////////////////////////////////
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// twoBitPredictor.sv
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//
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// Written: Ross Thomposn
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// Email: ross1728@gmail.com
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// Created: February 14, 2021
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// Modified:
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//
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// Purpose: 2 bit saturating counter predictor with parameterized table depth.
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//
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// A component of the Wally configurable RISC-V project.
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//
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// Copyright (C) 2021 Harvey Mudd College & Oklahoma State University
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation
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// files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy,
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// modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software
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// is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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// BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
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// OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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///////////////////////////////////////////
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`include "wally-config.vh"
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module twoBitPredictor
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#(parameter int Depth = 10
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)
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(input clk,
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input [`XLEN-1:0] LookUpPC,
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output [1:0] Prediction,
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// update
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input [`XLEN-1:0] UpdatePC,
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input UpdateEN,
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input [1:0] UpdatePrediction
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);
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SRAM2P1R1W #(Depth, 2) memory(.clk(clk),
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.RA1(LookUpPC),
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.RD1(PredictionMemory),
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.REN1(1'b1),
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.WA1(UpdatePC),
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.WD1(UpdatePrediction),
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.WEN1(UpdateEN));
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// need to forward when updating to the same address as reading.
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assign Prediction = (UpdatePC == LookUpPC) ? UpdatePrediction : PredictionMemory;
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endmodule
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