added BMU controll

src/ieu/bmu/bmuctrl.sv

@@ -0,0 +1,86 @@
+///////////////////////////////////////////
+// controller.sv
+//
+// Written: David_Harris@hmc.edu, Sarah.Harris@unlv.edu 
+// Created: 9 January 2021
+// Modified: 
+//
+// Purpose: Top level controller module
+// 
+// Documentation: RISC-V System on Chip Design Chapter 4 (Section 4.1.4, Figure 4.8, Table 4.5)
+//
+// 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.
+////////////////////////////////////////////////////////////////////////////////////////////////
+
+`include "wally-config.vh"
+
+// NOTE: DO we want to make this XLEN parameterized?
+module bmuctrl(
+  input  logic		    clk, reset,
+  // Decode stage control signals
+  input  logic        StallD, FlushD,          // Stall, flush Decode stage
+  input  logic [31:0] InstrD,                  // Instruction in Decode stage
+  output logic [2:0]  ALUSelectD,              // ALU Mux select signal
+  output logic        bextD,                   // Indicates if bit extract instruction
+  // Execute stage control signals             
+  input  logic 	      StallE, FlushE,          // Stall, flush Execute stage
+  output logic [6:0]  Funct7E,                 // Instruction's funct7 field (note: eventually want to get rid of this)
+  output logic [2:0]  ALUSelectE
+);
+
+  logic [6:0] OpD;                             // Opcode in Decode stage
+  logic [2:0] Funct3D;                         // Funct3 field in Decode stage
+  logic [6:0] Funct7D;                         // Funct7 field in Decode stage
+  logic [4:0] Rs1D;                            // Rs1 source register in Decode stage
+
+  `define BMUCTRLW 4
+
+  logic [`BMUCTRLW-1:0] BMUControlsD;                 // Main B Instructions Decoder control signals
+
+
+  // Extract fields
+  assign OpD = InstrD[6:0];
+  assign Funct3D = InstrD[14:12];
+  assign Funct7D = InstrD[31:25];
+  assign Rs1D = InstrD[19:15];
+
+  // Main Instruction Decoder
+  always_comb
+    casez({OpD, Funct7D, Funct3D})
+    // ALUSelect_bextD
+      17'b0010011_010010?_001: BMUControlsD = `BMUCTRLW'b111_0;    // bclri
+      17'b0010011_010010?_101: BMUControlsD = `BMUCTRLW'b101_1;    // bexti
+      17'b0010011_011010?_001: BMUControlsD = `BMUCTRLW'b100_0;    // binvi
+      17'b0010011_001010?_001: BMUControlsD = `BMUCTRLW'b110_0;    // bseti
+      17'b0110011_010010?_001: BMUControlsD = `BMUCTRLW'b111_0;    // bclr
+      17'b0110011_010010?_101: BMUControlsD = `BMUCTRLW'b101_1;    // bext
+      17'b0110011_011010?_001: BMUControlsD = `BMUCTRLW'b100_0;    // binv
+      17'b0110011_001010?_001: BMUControlsD = `BMUCTRLW'b110_0;    // bset
+      17'b0110011_0?00000_?01: BMUControlsD = `BMUCTRLW'b001_0;    // sra, srl, sll
+      default:                 BMUControlsD = {Funct3D, {1'b0}};// not B instruction or shift
+    endcase
+
+  // Unpack Control Signals
+
+  assign {ALUSelectD,bextD} = BMUControlsD;
+
+   
+
+  // BMU Execute stage pipieline control register
+  flopenrc#(10) controlregBMU(clk, reset, FlushE, ~StallE, {Funct7D, ALUSelectD}, {Funct7E, ALUSelectE});
+endmodule