test bench for comb_mem

1 files changed, 6 insertions, 0 deletions

diff --git a/nandgame/comb_mem_tb.sv b/nandgame/comb_mem_tb.sv
index a5646b8..6f8e226 100644
--- a/nandgame/comb_mem_tb.sv
+++ b/nandgame/comb_mem_tb.sv
@@ -39,13 +39,19 @@ initial begin
   repeat(3) @(posedge tst_clk);
   tst_write_A = 1;
   repeat(3) @(posedge tst_clk);
+  assert (tst_reg_A == 16'h55)
+  else   $error("Register A not written");
   tst_write_A = 0;
   tst_write_D = 1;
   repeat(3) @(posedge tst_clk);
+  assert (tst_reg_D == 16'h55)
+  else   $error("Register D not written");
   tst_write_D = 0;
   tst_write_pA = 1;
   tst_X = 16'haa;
   repeat(3) @(posedge tst_clk);
+  assert (tst_reg_pA == 16'haa)
+  else   $error("Register pA not written");
 
   $finish();
 end