Merge branch 'tx_policy' into u2p_txpolicy

* tx_policy: (21 commits)
  clean up DAC inversion and swapping to match schematics
  Clean up iq swapping on RX.  It is now swapped in the top level. widened muxes to 4 bits to match tx side and handle more ADCs in future
  rx error context packets should not be marked as errors in the fifo
  added compat number to usrp2 readback mux
  makefile dependency fix for second expansion
  provide a way to get out of the error state without processor intervention
  sequence number reset upon programming streamid
  attempt at avoiding infinite error messages
  implemented "next packet" and "next burst" policies
  sequence errors can happen on start of burst as well.
  more informative error codes
  cleaner error handling
  introduce new error types
  test mux and gen_context_pkt
  this is an output file, it shouldn't be checked in
  insert protocol engine flags when requested
  move the streamid so it isn't at the same address as clear_state
  connect the demux
  fix a typo
  tx error packets now muxed into the ethernet stream back to the host
  ...

1 files changed, 72 insertions, 0 deletions

diff --git a/usrp2/vrt/gen_context_pkt.v b/usrp2/vrt/gen_context_pkt.v
new file mode 100644
index 000000000..780a027ba
--- /dev/null
+++ b/usrp2/vrt/gen_context_pkt.v
@@ -0,0 +1,72 @@
+
+
+module gen_context_pkt
+  #(parameter PROT_ENG_FLAGS=1)
+   (input clk, input reset, input clear,
+    input trigger, output sent,
+    input [31:0] streamid,
+    input [63:0] vita_time,
+    input [31:0] message,
+    output [35:0] data_o, output src_rdy_o, input dst_rdy_i);
+   
+   localparam CTXT_IDLE = 0;
+   localparam CTXT_PROT_ENG = 1;
+   localparam CTXT_HEADER = 2;
+   localparam CTXT_STREAMID = 3;
+   localparam CTXT_SECS = 4;
+   localparam CTXT_TICS = 5;
+   localparam CTXT_TICS2 = 6;
+   localparam CTXT_MESSAGE = 7;
+   localparam CTXT_DONE = 8;
+
+   reg [33:0] 	 data_int;
+   wire 	 src_rdy_int, dst_rdy_int;
+   wire [3:0] 	 seqno = 0;
+   reg [3:0] 	 ctxt_state;
+   reg [63:0] 	 err_time;
+   
+   always @(posedge clk)
+     if(reset | clear)
+       ctxt_state <= CTXT_IDLE;
+     else
+       case(ctxt_state)
+	 CTXT_IDLE :
+	   if(trigger)
+	     begin
+		err_time <= vita_time;
+		if(PROT_ENG_FLAGS)
+		  ctxt_state <= CTXT_PROT_ENG;
+		else
+		  ctxt_state <= CTXT_HEADER;
+	     end
+	 
+	 CTXT_DONE :
+	   if(~trigger)
+	     ctxt_state <= CTXT_IDLE;
+
+	 default :
+	   if(dst_rdy_int)
+	     ctxt_state <= ctxt_state + 1;
+       endcase // case (ctxt_state)
+
+   assign src_rdy_int = ~( (ctxt_state == CTXT_IDLE) | (ctxt_state == CTXT_DONE) );
+   
+   always @*
+     case(ctxt_state)
+       CTXT_PROT_ENG : data_int <= { 2'b01, 16'd1, 16'd24 };
+       CTXT_HEADER : data_int <= { 1'b0, (PROT_ENG_FLAGS ? 1'b0 : 1'b1), 12'b010100001101, seqno, 16'd6 };
+       CTXT_STREAMID : data_int <= { 2'b00, streamid };
+       CTXT_SECS : data_int <= { 2'b00, err_time[63:32] };
+       CTXT_TICS : data_int <= { 2'b00, 32'd0 };
+       CTXT_TICS2 : data_int <= { 2'b00, err_time[31:0] };
+       CTXT_MESSAGE : data_int <= { 2'b10, message };
+       default : data_int <= {2'b00, 32'b00};
+     endcase // case (ctxt_state)
+
+   fifo_short #(.WIDTH(34)) ctxt_fifo
+     (.clk(clk), .reset(reset), .clear(clear),
+      .datain(data_int), .src_rdy_i(src_rdy_int), .dst_rdy_o(dst_rdy_int),
+      .dataout(data_o[33:0]), .src_rdy_o(src_rdy_o), .dst_rdy_i(dst_rdy_i));
+   assign data_o[35:34] = 2'b00;
+   
+endmodule // gen_context_pkt