1 files changed, 61 insertions, 0 deletions
diff --git a/usrp2/fifo/packet_verifier.v b/usrp2/fifo/packet_verifier.v
new file mode 100644
index 000000000..21a4c136e
--- /dev/null
+++ b/usrp2/fifo/packet_verifier.v
@@ -0,0 +1,61 @@
+
+
+// Packet format --
+//    Line 1 -- Length, 32 bits
+//    Line 2 -- Sequence number, 32 bits
+//    Last line -- CRC, 32 bits
+
+module packet_verifier
+  (input clk, input reset, input clear,
+   input [7:0] data_i, input sof_i, input eof_i, input src_rdy_i, output dst_rdy_o,
+
+   output reg [31:0] total, 
+   output reg [31:0] crc_err, 
+   output reg [31:0] seq_err, 
+   output reg [31:0] len_err);
+
+   reg [31:0] 	     seq_num;
+   reg [31:0] 	     length;
+   wire 	     first_byte, last_byte;
+   reg 		     second_byte, last_byte_d1;
+   wire 	     match_crc;
+   wire 	     calc_crc = src_rdy_i & dst_rdy_o;
+   
+   crc crc(.clk(clk), .reset(reset), .clear(last_byte_d1), .data(data_i), 
+	   .calc(calc_crc), .crc_out(), .match(match_crc));
+
+   assign first_byte = src_rdy_i & dst_rdy_o & sof_i;
+   assign last_byte = src_rdy_i & dst_rdy_o & eof_i;
+   assign dst_rdy_o = ~last_byte_d1;
+
+   // stubs for now
+   wire 	     match_seq = 1;
+   wire 	     match_len = 1;
+   
+   always @(posedge clk)
+     if(reset | clear)
+       last_byte_d1 <= 0;
+     else 
+       last_byte_d1 <= last_byte;
+
+   always @(posedge clk)
+     if(reset | clear)
+       begin
+	  total <= 0;
+	  crc_err <= 0;
+	  seq_err <= 0;
+	  len_err <= 0;
+       end
+     else
+       if(last_byte_d1)
+	 begin
+	    total <= total + 1;
+	    if(~match_crc)
+	      crc_err <= crc_err + 1;
+	    else if(~match_seq)
+	      seq_err <= seq_err + 1;
+	    else if(~match_len)
+	      seq_err <= len_err + 1;
+	 end
+   
+endmodule // packet_verifier