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24 lines
1.3 KiB
24 lines
1.3 KiB
3 years ago
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`timescale 1ns / 1ps
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// 立即数扩展
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module Imm_gen(
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input logic [31:0] inst_code,
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output logic [31:0] imm_out
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);
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// add your immediate extension logic here.
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logic [6:0] test;
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assign test = inst_code[6:0];
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always_comb
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case (test)
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7'b0010011: imm_out = {{20{inst_code[31]}}, inst_code[31:20]}; // andi, ori, addi
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7'b0000011: imm_out = {{20{inst_code[31]}}, inst_code[31:20]}; // lb, lh, lw, lbu, lhu
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7'b0100011: imm_out = {{20{inst_code[31]}}, inst_code[31:25], inst_code[11:7]}; // sb, sh, sw
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7'b1100011: imm_out = {{20{inst_code[31]}}, inst_code[31], inst_code[7], inst_code[30:25], inst_code[11:8]}; // beq, bne, blt, bge, bltu, bgeu
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7'b1101111: imm_out = {{12{inst_code[31]}}, inst_code[31], inst_code[19:12], inst_code[20], inst_code[30:21]}; // jal
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7'b1100111: imm_out = {{20{inst_code[31]}}, inst_code[31:20]}; // jalr
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7'b0110111: imm_out = {inst_code[31:12], 12'b0}; // lui
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default: imm_out = 32'd0;
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endcase
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endmodule
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