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Implement LD ($FF00+C), A

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This commit is contained in:
Koray Yanik
2021-02-20 22:10:47 +00:00
parent b1b2055db9
commit 49ce1631b3
6 changed files with 47 additions and 14 deletions
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17
sim/tbench/tb_top.sv
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@@ -15,18 +15,31 @@ module tb_top ();
// Testbench code
logic instr_undef;
logic halted;
logic [15:0] last_pc;
logic [ 7:0] last_opcode;
logic we;
logic [15:0] address;
logic [ 7:0] wdata;
assign halted = gb_inst.cpu_inst.control_inst.halted_r;
assign instr_undef = gb_inst.cpu_inst.control_inst.is_undef;
assign last_pc = gb_inst.cpu_inst.control_inst.instr_pc_r;
assign last_opcode = gb_inst.cpu_inst.control_inst.instr_r;
assign we = gb_inst.we;
assign address = gb_inst.address;
assign wdata = gb_inst.wdata;
always @(posedge clk) begin
if (nreset && instr_undef) begin
$info($sformatf("[%t] %X: Undefined opcode %X", $time(), last_pc, last_opcode));
if (nreset && instr_undef & ~halted) begin
$display($sformatf("[%t] %X: Undefined opcode %X", $time(), last_pc, last_opcode));
$fatal(0);
end
if (nreset && we) begin
$display($sformatf("[%t] Write: [%X] <= %X", $time(), address, wdata));
end
end
endmodule : tb_top