eater: Use separate "zbuffer" module

keeps code a bit cleaner

1 files changed, 9 insertions, 0 deletions

diff --git a/eater_cpu/eater_computer_tb.sv b/eater_cpu/eater_computer_tb.sv
index 74ffb8a..5b14620 100644
--- a/eater_cpu/eater_computer_tb.sv
+++ b/eater_cpu/eater_computer_tb.sv
@@ -30,6 +30,8 @@ initial begin
   uut.ALU_to_bus = 0;
   uut.RAM_to_bus = 0;
   uut.PC_to_bus = 0;
+  uut.PC_count_en = 0;
+
   uut.bus_to_A = 0;
   uut.bus_to_B = 0;
   uut.bus_to_INS = 0;
@@ -79,6 +81,13 @@ initial begin
   @(negedge clk_in);
   assert (uut.bus == 8'('haa + 'hbb))
   else   $error("Expected 0x%02x, got 0x%02x on bus", 8'('haa + 'hbb), uut.bus);
+  uut.ALU_to_bus = 0;
+  uut.PC_to_bus = 1;
+
+  @(negedge clk_in);
+  assert (uut.bus == 'h00) 
+  else   $error("Expected 0x00, got 0x%02x on bus", uut.bus);
+  uut.PC_to_bus = 0;
 
   #10
   $finish();