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

1 files changed, 51 insertions, 0 deletions

diff --git a/fpga/usrp3/lib/vita/context_packet_gen.v b/fpga/usrp3/lib/vita/context_packet_gen.v
new file mode 100644
index 000000000..2782f66df
--- /dev/null
+++ b/fpga/usrp3/lib/vita/context_packet_gen.v
@@ -0,0 +1,51 @@
+
+module context_packet_gen
+  (input clk, input reset, input clear,
+   input trigger,
+   input [11:0] seqnum,
+   input [31:0] sid,
+   input [63:0] body,
+   input [63:0] vita_time,
+
+   output done,
+   output reg [63:0] o_tdata, output o_tlast, output o_tvalid, input o_tready);
+   
+   reg [1:0] 	     cp_state;
+   localparam CP_IDLE = 2'd0;
+   localparam CP_HEAD = 2'd1;
+   localparam CP_TIME = 2'd2;
+   localparam CP_DATA = 2'd3;
+   
+   always @(posedge clk)
+     if(reset|clear)
+       cp_state <= CP_IDLE;
+     else
+       case(cp_state)
+	 CP_IDLE :
+	   if(trigger)
+	     cp_state <= CP_HEAD;
+	 CP_HEAD :
+	   if(o_tready)
+	     cp_state <= CP_TIME;
+	 CP_TIME :
+	   if(o_tready)
+	     cp_state <= CP_DATA;
+	 CP_DATA :
+	   if(o_tready)
+	     cp_state <= CP_IDLE;
+       endcase // case (cp_state)
+
+   assign o_tvalid = (cp_state != CP_IDLE);
+   assign o_tlast = (cp_state == CP_DATA);
+
+   always @*
+     case(cp_state)
+       CP_HEAD : o_tdata <= { 4'hA, seqnum, 16'd24, sid };
+       CP_TIME : o_tdata <= vita_time;
+       CP_DATA : o_tdata <= body;
+       default : o_tdata <= body;
+     endcase // case (cp_state)
+
+   assign done = o_tlast & o_tvalid & o_tready;
+   
+endmodule // context_packet_gen