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RISC-V_Verilog
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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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2 changed files with 3 additions and 15 deletions
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15
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] immediate, output reg [31:0] immediate,
output reg we_reg, adder_pc, data_out, output reg we_reg, adder_pc,
output reg [1:0] input_reg, output reg [1:0] input_reg,
output reg [4:0] select_a, select_b, select_d, output reg [4:0] select_a, select_b, select_d,
output reg source_alu, output reg source_alu,
@ -80,7 +80,6 @@ endfunction
immediate = 0; immediate = 0;
we_reg = 1; we_reg = 1;
adder_pc = 0; adder_pc = 0;
data_out = 0;
input_reg = 2'b01; input_reg = 2'b01;
select_a = instruction[19:15]; select_a = instruction[19:15];
select_b = instruction[24:20]; select_b = instruction[24:20];
@ -91,14 +90,12 @@ endfunction
jmp_pc = 2'b00; jmp_pc = 2'b00;
b_pc = 0; b_pc = 0;
alu_not = 0; alu_not = 0;
alu_not = 0;
end end
5'b00100 : begin // OP-IMM - Addi, ... 5'b00100 : begin // OP-IMM - Addi, ...
immediate[11:0] = instruction[31:20]; immediate[11:0] = instruction[31:20];
immediate[31:12] = (instruction[14:12] == 3'b011 || instruction[31] == 0) ? 12'b00000000000000000000 : 12'b11111111111111111111; immediate[31:12] = (instruction[14:12] == 3'b011 || instruction[31] == 0) ? 12'b00000000000000000000 : 12'b11111111111111111111;
we_reg = 1; we_reg = 1;
adder_pc = 0; adder_pc = 0;
data_out = 0;
input_reg = 2'b01; input_reg = 2'b01;
select_a = instruction[19:15]; select_a = instruction[19:15];
select_b = 5'b00000; select_b = 5'b00000;
@ -115,7 +112,6 @@ endfunction
immediate[31:12] = (instruction[14:12] == 3'b100 || instruction[14:12] == 3'b101 || instruction[31] == 0) ? 12'b00000000000000000000 : 12'b11111111111111111111; immediate[31:12] = (instruction[14:12] == 3'b100 || instruction[14:12] == 3'b101 || instruction[31] == 0) ? 12'b00000000000000000000 : 12'b11111111111111111111;
we_reg = 1; we_reg = 1;
adder_pc = 0; adder_pc = 0;
data_out = 0;
input_reg = 2'b10; input_reg = 2'b10;
select_a = instruction[19:15]; select_a = instruction[19:15];
select_b = 5'b00000; select_b = 5'b00000;
@ -132,7 +128,6 @@ endfunction
immediate[31:12] = (instruction[31] == 0) ? 12'b00000000000000000000 : 12'b11111111111111111111; immediate[31:12] = (instruction[31] == 0) ? 12'b00000000000000000000 : 12'b11111111111111111111;
we_reg = 0; we_reg = 0;
adder_pc = 0; adder_pc = 0;
data_out = 0;
input_reg = 2'b01; input_reg = 2'b01;
select_a = instruction[19:15]; select_a = instruction[19:15];
select_b = instruction[24:20]; select_b = instruction[24:20];
@ -149,7 +144,6 @@ endfunction
immediate[31:12] = (instruction[14:12] == 3'b110 || instruction[14:12] == 3'b111 || instruction[31] == 0) ? 12'b00000000000000000000 : 12'b11111111111111111111; immediate[31:12] = (instruction[14:12] == 3'b110 || instruction[14:12] == 3'b111 || instruction[31] == 0) ? 12'b00000000000000000000 : 12'b11111111111111111111;
we_reg = 0; we_reg = 0;
adder_pc = 0; adder_pc = 0;
data_out = 0;
input_reg = 2'b01; input_reg = 2'b01;
select_a = instruction[19:15]; select_a = instruction[19:15];
select_b = instruction[24:20]; select_b = instruction[24:20];
@ -166,7 +160,6 @@ endfunction
immediate[31:20] = (instruction[31] == 0) ? 12'b000000000000 : 12'b111111111111; immediate[31:20] = (instruction[31] == 0) ? 12'b000000000000 : 12'b111111111111;
we_reg = 1; we_reg = 1;
adder_pc = 0; adder_pc = 0;
data_out = 0;
input_reg = 2'b00; input_reg = 2'b00;
select_a = 5'b00000; select_a = 5'b00000;
select_b = 5'b00000; select_b = 5'b00000;
@ -183,7 +176,6 @@ endfunction
immediate[31:20] = (instruction[31] == 0) ? 12'b000000000000 : 12'b111111111111; immediate[31:20] = (instruction[31] == 0) ? 12'b000000000000 : 12'b111111111111;
we_reg = 1; we_reg = 1;
adder_pc = 0; adder_pc = 0;
data_out = 0;
input_reg = 2'b00; input_reg = 2'b00;
select_a = instruction[19:15]; select_a = instruction[19:15];
select_b = 5'b00000; select_b = 5'b00000;
@ -199,7 +191,6 @@ endfunction
immediate = {instruction[31:12] << 12, 12'b000000000000}; immediate = {instruction[31:12] << 12, 12'b000000000000};
we_reg = 1; we_reg = 1;
adder_pc = 0; adder_pc = 0;
data_out = 1;
input_reg = 2'b01; input_reg = 2'b01;
select_a = 5'b00000; select_a = 5'b00000;
select_b = 5'b00000; select_b = 5'b00000;
@ -215,12 +206,11 @@ endfunction
immediate = {instruction[31:12] << 12, 12'b000000000000}; immediate = {instruction[31:12] << 12, 12'b000000000000};
we_reg = 1; we_reg = 1;
adder_pc = 1; adder_pc = 1;
data_out = 1;
input_reg = 2'b00; input_reg = 2'b00;
select_a = 5'b00000; select_a = 5'b00000;
select_b = 5'b00000; select_b = 5'b00000;
select_d = instruction[11:7]; select_d = instruction[11:7];
source_alu = 0; source_alu = 1;
op_code_alu = 3'b000; op_code_alu = 3'b000;
mem_we = 0; mem_we = 0;
jmp_pc = 2'b00; jmp_pc = 2'b00;
@ -231,7 +221,6 @@ endfunction
immediate = 32'b0; immediate = 32'b0;
we_reg = 0; we_reg = 0;
adder_pc = 0; adder_pc = 0;
data_out = 0;
input_reg = 2'b00; input_reg = 2'b00;
select_a = 5'b00000; select_a = 5'b00000;
select_b = 5'b00000; select_b = 5'b00000;

3
rtl/risc_v_cpu.v
View File

@ -4,7 +4,7 @@ module risc_v_cpu (input clock, reset, output [31:0] out);
wire [31:0] alu_out; wire [31:0] alu_out;
wire [31:0] instruction; wire [31:0] instruction;
wire we_reg, adder_pc, data_out; wire we_reg, adder_pc;
wire [1:0] input_reg; wire [1:0] input_reg;
wire [4:0] select_a, select_b, select_d; wire [4:0] select_a, select_b, select_d;
wire source_alu; wire source_alu;
@ -32,7 +32,6 @@ module risc_v_cpu (input clock, reset, output [31:0] out);
.immediate(immediate), .immediate(immediate),
.we_reg(we_reg), .we_reg(we_reg),
.adder_pc(adder_pc), .adder_pc(adder_pc),
.data_out(data_out),
.input_reg(input_reg), .input_reg(input_reg),
.select_a(select_a), .select_a(select_a),
.select_b(select_b), .select_b(select_b),