diff options
Diffstat (limited to 'eater_cpu')
| -rw-r--r-- | eater_cpu/eater_computer_tb.sv | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/eater_cpu/eater_computer_tb.sv b/eater_cpu/eater_computer_tb.sv index eab7b23..cc024f4 100644 --- a/eater_cpu/eater_computer_tb.sv +++ b/eater_cpu/eater_computer_tb.sv @@ -120,6 +120,16 @@ initial begin assert (uut.ALU_flags_int.Carry == 1) else $error("Expected carry flag from ALU, got it not."); + uut.manual_flags.ALU_subtract_nadd = 1; + + @(negedge clk_in); + assert (uut.bus == 8'('haa - 'hbb)) + else $error("Expected 0x%02x (from ALU), got 0x%02x on bus", 8'('haa - 'hbb), uut.bus); + + assert (uut.ALU_flags_int.Carry == 1) + else $error("Expected carry flag from ALU, got it not."); + + uut.manual_flags.ALU_subtract_nadd = 0; uut.manual_flags.ALU_out = 0; uut.manual_flags.PC_out = 1; |