Add CRC generation for sd card

Works great according to the testbench
2025-06-06 18:13:14 -07:00
parent 35cb264b26
commit 71f08bdf15
5 changed files with 222 additions and 2 deletions
@@ -0,0 +1,49 @@
+module crc_gen_tb;
+    parameter CRCBITS=7;
+    parameter COMMANDLEN=40;
+    parameter POLYNOMIAL='h89;
+
+    logic clk, reset, start, ready;
+    logic [COMMANDLEN-1:0] num;
+    logic [CRCBITS-1:0] crc;
+
+    logic [CRCBITS-1:0] test_cases [logic [COMMANDLEN-1:0]];
+
+    crc_gen #(CRCBITS,COMMANDLEN,POLYNOMIAL) dut (.*);
+
+    initial begin
+        clk = 0;
+        forever #10 clk = ~clk;
+    end
+
+    initial begin
+        test_cases = '{
+            'h1234567890: 'h10,
+            'hBEEFB05535: 'h05,
+            'h5544992211: 'h17,
+            '0: '0
+        };
+
+        reset = 1;
+        start = 0;
+        repeat (2) @(posedge clk);
+        reset = 0;
+        @(posedge clk);
+        foreach (test_cases[key]) begin
+            wait (ready);
+            num = key;
+            @(posedge clk);
+            start = 1;
+            @(posedge clk);
+            start = 0;
+            @(posedge clk);
+            wait(ready);
+            assert (crc === test_cases[key])
+                else $error("Invalid crc, found 0x%x but expected 0x%x",crc,test_cases[key]);
+        end
+
+        $finish;
+
+    end
+
+endmodule