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Control_Unit.v
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`timescale 1ns / 1ps
module Control_Unit(
input[3:0] opcode,
output reg[1:0] alu_op,
output reg jump,beq,bne,mem_read,mem_write,alu_src,reg_dst,mem_to_reg,reg_write
);
always @(*)
begin
case(opcode)
4'b0000: // LW
begin
reg_dst = 1'b0;
alu_src = 1'b1;
mem_to_reg = 1'b1;
reg_write = 1'b1;
mem_read = 1'b1;
mem_write = 1'b0;
beq = 1'b0;
bne = 1'b0;
alu_op = 2'b10;
jump = 1'b0;
end
4'b0001: // SW
begin
reg_dst = 1'b0;
alu_src = 1'b1;
mem_to_reg = 1'b0;
reg_write = 1'b0;
mem_read = 1'b0;
mem_write = 1'b1;
beq = 1'b0;
bne = 1'b0;
alu_op = 2'b10;
jump = 1'b0;
end
4'b0010: // data_processing
begin
reg_dst = 1'b1;
alu_src = 1'b0;
mem_to_reg = 1'b0;
reg_write = 1'b1;
mem_read = 1'b0;
mem_write = 1'b0;
beq = 1'b0;
bne = 1'b0;
alu_op = 2'b00;
jump = 1'b0;
end
4'b0011: // data_processing
begin
reg_dst = 1'b1;
alu_src = 1'b0;
mem_to_reg = 1'b0;
reg_write = 1'b1;
mem_read = 1'b0;
mem_write = 1'b0;
beq = 1'b0;
bne = 1'b0;
alu_op = 2'b00;
jump = 1'b0;
end
4'b0100: // data_processing
begin
reg_dst = 1'b1;
alu_src = 1'b0;
mem_to_reg = 1'b0;
reg_write = 1'b1;
mem_read = 1'b0;
mem_write = 1'b0;
beq = 1'b0;
bne = 1'b0;
alu_op = 2'b00;
jump = 1'b0;
end
4'b0101: // data_processing
begin
reg_dst = 1'b1;
alu_src = 1'b0;
mem_to_reg = 1'b0;
reg_write = 1'b1;
mem_read = 1'b0;
mem_write = 1'b0;
beq = 1'b0;
bne = 1'b0;
alu_op = 2'b00;
jump = 1'b0;
end
4'b0110: // data_processing
begin
reg_dst = 1'b1;
alu_src = 1'b0;
mem_to_reg = 1'b0;
reg_write = 1'b1;
mem_read = 1'b0;
mem_write = 1'b0;
beq = 1'b0;
bne = 1'b0;
alu_op = 2'b00;
jump = 1'b0;
end
4'b0111: // data_processing
begin
reg_dst = 1'b1;
alu_src = 1'b0;
mem_to_reg = 1'b0;
reg_write = 1'b1;
mem_read = 1'b0;
mem_write = 1'b0;
beq = 1'b0;
bne = 1'b0;
alu_op = 2'b00;
jump = 1'b0;
end
4'b1000: // data_processing
begin
reg_dst = 1'b1;
alu_src = 1'b0;
mem_to_reg = 1'b0;
reg_write = 1'b1;
mem_read = 1'b0;
mem_write = 1'b0;
beq = 1'b0;
bne = 1'b0;
alu_op = 2'b00;
jump = 1'b0;
end
4'b1001: // data_processing
begin
reg_dst = 1'b1;
alu_src = 1'b0;
mem_to_reg = 1'b0;
reg_write = 1'b1;
mem_read = 1'b0;
mem_write = 1'b0;
beq = 1'b0;
bne = 1'b0;
alu_op = 2'b00;
jump = 1'b0;
end
4'b1011: // BEQ
begin
reg_dst = 1'b0;
alu_src = 1'b0;
mem_to_reg = 1'b0;
reg_write = 1'b0;
mem_read = 1'b0;
mem_write = 1'b0;
beq = 1'b1;
bne = 1'b0;
alu_op = 2'b01;
jump = 1'b0;
end
4'b1100: // BNE
begin
reg_dst = 1'b0;
alu_src = 1'b0;
mem_to_reg = 1'b0;
reg_write = 1'b0;
mem_read = 1'b0;
mem_write = 1'b0;
beq = 1'b0;
bne = 1'b1;
alu_op = 2'b01;
jump = 1'b0;
end
4'b1101: // J
begin
reg_dst = 1'b0;
alu_src = 1'b0;
mem_to_reg = 1'b0;
reg_write = 1'b0;
mem_read = 1'b0;
mem_write = 1'b0;
beq = 1'b0;
bne = 1'b0;
alu_op = 2'b00;
jump = 1'b1;
end
default: begin
reg_dst = 1'b1;
alu_src = 1'b0;
mem_to_reg = 1'b0;
reg_write = 1'b1;
mem_read = 1'b0;
mem_write = 1'b0;
beq = 1'b0;
bne = 1'b0;
alu_op = 2'b00;
jump = 1'b0;
end
endcase
end
endmodule