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RISC-V base implementation #1

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BriceBoisson merged 17 commits from risc-v into main 2023-10-24 12:20:46 +00:00
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12
rtl/decoder.v
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@ -1,6 +1,6 @@
module decoder (input [31:0] instruction, module decoder (input [31:0] instruction,
output reg [31:0] imm, output reg [31:0] imm,
output reg reg_we, adder_pc, output reg reg_we,
output reg [1:0] reg_sel_data_in, output reg [1:0] reg_sel_data_in,
output reg [4:0] reg_sel_out_a, reg_sel_out_b, reg_sel_in, output reg [4:0] reg_sel_out_a, reg_sel_out_b, reg_sel_in,
output reg alu_src, output reg alu_src,
@ -81,7 +81,6 @@ endfunction
OP : begin // OP - Add, ... OP : begin // OP - Add, ...
imm = 0; imm = 0;
reg_we = 1; reg_we = 1;
adder_pc = 0;
reg_sel_data_in = 2'b00; reg_sel_data_in = 2'b00;
reg_sel_out_a = instruction[19:15]; reg_sel_out_a = instruction[19:15];
reg_sel_out_b = instruction[24:20]; reg_sel_out_b = instruction[24:20];
@ -97,7 +96,6 @@ endfunction
imm[11:0] = instruction[31:20]; imm[11:0] = instruction[31:20];
imm[31:12] = (instruction[14:12] == 3'b011 || instruction[31] == 0) ? 12'b00000000000000000000 : 12'b11111111111111111111; imm[31:12] = (instruction[14:12] == 3'b011 || instruction[31] == 0) ? 12'b00000000000000000000 : 12'b11111111111111111111;
reg_we = 1; reg_we = 1;
adder_pc = 0;
reg_sel_data_in = 2'b00; reg_sel_data_in = 2'b00;
reg_sel_out_a = instruction[19:15]; reg_sel_out_a = instruction[19:15];
reg_sel_out_b = 5'b00000; reg_sel_out_b = 5'b00000;
@ -113,7 +111,6 @@ endfunction
imm[11:0] = instruction[31:20]; imm[11:0] = instruction[31:20];
imm[31:12] = (instruction[14:12] == 3'b100 || instruction[14:12] == 3'b101 || instruction[31] == 0) ? 12'b00000000000000000000 : 12'b11111111111111111111; imm[31:12] = (instruction[14:12] == 3'b100 || instruction[14:12] == 3'b101 || instruction[31] == 0) ? 12'b00000000000000000000 : 12'b11111111111111111111;
reg_we = 1; reg_we = 1;
adder_pc = 0;
reg_sel_data_in = 2'b01; reg_sel_data_in = 2'b01;
reg_sel_out_a = instruction[19:15]; reg_sel_out_a = instruction[19:15];
reg_sel_out_b = 5'b00000; reg_sel_out_b = 5'b00000;
@ -129,7 +126,6 @@ endfunction
imm[11:0] = {instruction[31:25], instruction[11:7]}; imm[11:0] = {instruction[31:25], instruction[11:7]};
imm[31:12] = (instruction[31] == 0) ? 12'b00000000000000000000 : 12'b11111111111111111111; imm[31:12] = (instruction[31] == 0) ? 12'b00000000000000000000 : 12'b11111111111111111111;
reg_we = 0; reg_we = 0;
adder_pc = 0;
reg_sel_data_in = 2'b00; reg_sel_data_in = 2'b00;
reg_sel_out_a = instruction[19:15]; reg_sel_out_a = instruction[19:15];
reg_sel_out_b = instruction[24:20]; reg_sel_out_b = instruction[24:20];
@ -145,7 +141,6 @@ endfunction
imm[11:0] = {instruction[31:25], instruction[11:7]}; imm[11:0] = {instruction[31:25], instruction[11:7]};
imm[31:12] = (instruction[14:12] == 3'b110 || instruction[14:12] == 3'b111 || instruction[31] == 0) ? 12'b00000000000000000000 : 12'b11111111111111111111; imm[31:12] = (instruction[14:12] == 3'b110 || instruction[14:12] == 3'b111 || instruction[31] == 0) ? 12'b00000000000000000000 : 12'b11111111111111111111;
reg_we = 0; reg_we = 0;
adder_pc = 0;
reg_sel_data_in = 2'b00; reg_sel_data_in = 2'b00;
reg_sel_out_a = instruction[19:15]; reg_sel_out_a = instruction[19:15];
reg_sel_out_b = instruction[24:20]; reg_sel_out_b = instruction[24:20];
@ -161,7 +156,6 @@ endfunction
imm[19:0] = instruction[31:12]; imm[19:0] = instruction[31:12];
imm[31:20] = (instruction[31] == 0) ? 12'b000000000000 : 12'b111111111111; imm[31:20] = (instruction[31] == 0) ? 12'b000000000000 : 12'b111111111111;
reg_we = 1; reg_we = 1;
adder_pc = 0;
reg_sel_data_in = 2'b10; reg_sel_data_in = 2'b10;
reg_sel_out_a = 5'b00000; reg_sel_out_a = 5'b00000;
reg_sel_out_b = 5'b00000; reg_sel_out_b = 5'b00000;
@ -177,7 +171,6 @@ endfunction
imm[11:0] = instruction[31:20]; imm[11:0] = instruction[31:20];
imm[31:12] = (instruction[31] == 0) ? 12'b00000000000000000000 : 12'b11111111111111111111; imm[31:12] = (instruction[31] == 0) ? 12'b00000000000000000000 : 12'b11111111111111111111;
reg_we = 1; reg_we = 1;
adder_pc = 0;
reg_sel_data_in = 2'b10; reg_sel_data_in = 2'b10;
reg_sel_out_a = instruction[19:15]; reg_sel_out_a = instruction[19:15];
reg_sel_out_b = 5'b00000; reg_sel_out_b = 5'b00000;
@ -192,7 +185,6 @@ endfunction
LUI : begin // LUI - lui LUI : begin // LUI - lui
imm = {instruction[31:12] << 12, 12'b000000000000}; imm = {instruction[31:12] << 12, 12'b000000000000};
reg_we = 1; reg_we = 1;
adder_pc = 0;
reg_sel_data_in = 2'b00; reg_sel_data_in = 2'b00;
reg_sel_out_a = 5'b00000; reg_sel_out_a = 5'b00000;
reg_sel_out_b = 5'b00000; reg_sel_out_b = 5'b00000;
@ -207,7 +199,6 @@ endfunction
AUIPC : begin // AUIPC - auipc AUIPC : begin // AUIPC - auipc
imm = {instruction[31:12] << 12, 12'b000000000000}; imm = {instruction[31:12] << 12, 12'b000000000000};
reg_we = 1; reg_we = 1;
adder_pc = 1;
reg_sel_data_in = 2'b11; reg_sel_data_in = 2'b11;
reg_sel_out_a = 5'b00000; reg_sel_out_a = 5'b00000;
reg_sel_out_b = 5'b00000; reg_sel_out_b = 5'b00000;
@ -222,7 +213,6 @@ endfunction
default : begin // NOP default : begin // NOP
imm = 32'b0; imm = 32'b0;
reg_we = 0; reg_we = 0;
adder_pc = 0;
reg_sel_data_in = 2'b00; reg_sel_data_in = 2'b00;
reg_sel_out_a = 5'b00000; reg_sel_out_a = 5'b00000;
reg_sel_out_b = 5'b00000; reg_sel_out_b = 5'b00000;

9
rtl/risc_v_cpu.v
View File

@ -17,14 +17,12 @@ module risc_v_cpu (input clock, reset, output [31:0] out);
wire [1:0] jmp_pc; wire [1:0] jmp_pc;
wire b_pc; wire b_pc;
wire adder_pc;
wire [31:0] imm; wire [31:0] imm;
wire [1:0] pc_sel_in;
wire [31:0] pc_addr; wire [31:0] pc_addr;
wire [31:0] pc_new_addr; wire [31:0] pc_new_addr;
wire [1:0] pc_in;
wire [31:0] pc_store; wire [31:0] pc_store;
@ -32,7 +30,6 @@ module risc_v_cpu (input clock, reset, output [31:0] out);
.instruction(instruction), .instruction(instruction),
.imm(imm), .imm(imm),
.reg_we(reg_we), .reg_we(reg_we),
.adder_pc(adder_pc),
.reg_sel_data_in(reg_sel_data_in), .reg_sel_data_in(reg_sel_data_in),
.reg_sel_out_a(reg_sel_out_a), .reg_sel_out_a(reg_sel_out_a),
.reg_sel_out_b(reg_sel_out_b), .reg_sel_out_b(reg_sel_out_b),
@ -75,7 +72,7 @@ module risc_v_cpu (input clock, reset, output [31:0] out);
.A(jmp_pc), .A(jmp_pc),
.B({alu_out[1], (alu_not ? ~alu_out[0] : alu_out[0])}), .B({alu_out[1], (alu_not ? ~alu_out[0] : alu_out[0])}),
.S(b_pc), .S(b_pc),
.O(pc_in) .O(pc_sel_in)
); );
mux4_1 mux4_1_1 ( mux4_1 mux4_1_1 (
@ -83,7 +80,7 @@ module risc_v_cpu (input clock, reset, output [31:0] out);
.B(pc_addr + imm), .B(pc_addr + imm),
.C(alu_out), .C(alu_out),
.D(0), .D(0),
.S(pc_in), .S(pc_sel_in),
.O(pc_new_addr) .O(pc_new_addr)
); );