Squashed B200 FPGA Source. Code from Josh Blum, Ian Buckley, and Matt Ettus.

Original-commit: 0df4b801a34697f2058b4a7b95e08d2a0576c9db

lib/packet_proc/cvita_insert_tlast.v

@@ -0,0 +1,33 @@
+
+// Insert tlast bit for fifos that don't support it.  This only works with VALID CVITA frames
+//  A single partial or invalid frame will make this wrong FOREVER
+
+module cvita_insert_tlast
+  (input clk, input reset, input clear,
+   input [63:0] i_tdata, input i_tvalid, output i_tready,
+   output [63:0] o_tdata, output o_tlast, output o_tvalid, input o_tready);
+
+   assign o_tdata = i_tdata;
+   assign o_tvalid = i_tvalid;
+   assign i_tready = o_tready;
+
+   wire [15:0] cvita_len_ceil = i_tdata[47:32] + 7;
+   wire [15:0] axi_len = {3'b000, cvita_len_ceil[15:3]};
+   
+   reg [15:0] 	 count;
+
+   assign o_tlast = (count != 0) ? (count == 16'd1) : (axi_len == 16'd1);
+
+   always @(posedge clk)
+     if(reset | clear)
+       begin
+	  count <= 16'd0;
+       end
+     else
+       if(i_tready & i_tvalid)
+	 if(count != 16'd0)
+	   count <= count - 16'd1;
+	 else
+	   count <= axi_len - 16'd1;
+   
+endmodule // cvita_insert_tlast