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fix of

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Nicholas Orlowsky 2024-04-08 01:31:04 -05:00
parent f63cc9738f
commit 1f41f702e2
Signed by: nickorlow
GPG key ID: 838827D8C4611687
1 changed files with 3 additions and 1 deletions
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4
cpu.sv
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@ -17,6 +17,7 @@ module cpu (
logic [7:0] alu_result; logic [7:0] alu_result;
logic alu_overflow; logic alu_overflow;
logic alu_done; logic alu_done;
logic compute_of;
alu alu ( alu alu (
alu_rst, alu_rst,
@ -193,6 +194,7 @@ module cpu (
instr.alu_i.op <= structs::ADD; instr.alu_i.op <= structs::ADD;
instr.alu_i.operand_a <= opcode[7:0]; instr.alu_i.operand_a <= opcode[7:0];
instr.alu_i.operand_b <= registers[opcode[11:8]]; instr.alu_i.operand_b <= registers[opcode[11:8]];
compute_of <= 0;
state <= ST_EXEC; state <= ST_EXEC;
end end
@ -312,7 +314,7 @@ module cpu (
if (alu_done) begin if (alu_done) begin
instr.src <= BYTE; instr.src <= BYTE;
instr.src_byte <= alu_result; instr.src_byte <= alu_result;
registers[15] <= alu_overflow; registers[15] <= compute_of ? alu_overflow : registers[15];
state <= ST_WB; state <= ST_WB;
program_counter <= program_counter + 2; program_counter <= program_counter + 2;
end end