Broken SD card

How tf did it break bro

verification/sd/sd_controller_tb.sv

@@ -0,0 +1,45 @@
+module sd_controller_tb;
+    bit slow_clk,fast_clk,crc_clk;
+    logic reset,sd_data;
+    wire sd_cmd;
+    wire ready;
+    wire clk;
+    audio_buffer_interface buffer ();
+
+    sd_controller dut (.buffer(buffer.driver), .*);
+
+    bit sd_write;
+
+    assign sd_cmd = sd_write ? 'z : 0;
+
+    initial forever #100 slow_clk = ~slow_clk;
+
+    initial forever #1 crc_clk = ~crc_clk;
+    initial forever #10 fast_clk = ~fast_clk;
+
+    initial begin
+
+        sd_write = 1;
+        reset = 1;
+        repeat (2) @(posedge slow_clk);
+        reset = 0;
+        repeat (200) @(posedge slow_clk);
+        send_response();
+
+        repeat (100) @(posedge slow_clk);
+        send_response();
+        repeat (100) @(posedge slow_clk);
+
+        $finish;
+
+    end
+
+    task automatic send_response();
+        for(int i=0;i<47;i++)
+            @(posedge slow_clk) sd_write = 0;
+        @(posedge slow_clk) sd_write = 1;
+    endtask
+
+
+
+endmodule