feat(L06): add control flow and program counter card

2026-07-21 17:09:05 +02:00
commit 3eb73ea715
42 changed files with 7212 additions and 0 deletions
@@ -0,0 +1,23 @@
+module tb;
+    logic clk = 0, rst = 1, jump = 0, branch_taken = 0;
+    logic [31:0] target = 0, pc;
+    logic [31:0] expected [0:6] = '{32'h0,32'h4,32'h8,32'h20,32'h24,32'h10,32'h14};
+    string trace_file;
+    program_counter dut (.*);
+    always #1 clk = ~clk;
+    task automatic tick_and_check(input integer index);
+        @(posedge clk); #1;
+        if (pc !== expected[index]) $fatal(1, "FAIL index=%0d pc=%h expected=%h", index, pc, expected[index]);
+    endtask
+    initial begin
+        if ($value$plusargs("trace=%s", trace_file)) begin $dumpfile(trace_file); $dumpvars(0, tb); end
+        tick_and_check(0); @(negedge clk); rst = 0;
+        tick_and_check(1); tick_and_check(2);
+        @(negedge clk); branch_taken = 1; target = 32'h20; tick_and_check(3);
+        @(negedge clk); branch_taken = 0; tick_and_check(4);
+        @(negedge clk); jump = 1; target = 32'h10; tick_and_check(5);
+        @(negedge clk); jump = 0; tick_and_check(6);
+        $display("PASS task03 pc=00000000,00000004,00000008,00000020,00000024,00000010,00000014 branches=1 jumps=1");
+        $finish;
+    end
+endmodule