Merge branch 'master' into mwest/b200_docs

1 files changed, 40 insertions, 0 deletions

diff --git a/fpga/usrp3/lib/axi/axi_chdr_header_trigger.v b/fpga/usrp3/lib/axi/axi_chdr_header_trigger.v
new file mode 100644
index 000000000..e8dee3675
--- /dev/null
+++ b/fpga/usrp3/lib/axi/axi_chdr_header_trigger.v
@@ -0,0 +1,40 @@
+
+// Copyright 2014 Ettus Research LLC
+
+
+module axi_chdr_header_trigger
+  #(
+    parameter WIDTH=64,
+    parameter SID=0
+   )
+    (input clk, input reset, input clear,
+     input [WIDTH-1:0] i_tdata, input i_tlast, input i_tvalid, input i_tready,
+     output trigger
+     );
+
+   
+   reg 	  state;
+   localparam IDLE = 0;
+   localparam RUN  = 1;
+ 
+
+   always @(posedge clk)
+     if(reset | clear)
+       state <= IDLE;
+     else
+       case (state)
+	 IDLE :
+	   if(i_tvalid && i_tready)
+	     state <= RUN;
+
+	 RUN :
+	   if(i_tready && i_tvalid && i_tlast)	    
+	     state <= IDLE;
+
+	 default :
+	   state <= IDLE;
+       endcase // case (state)
+
+   assign     trigger =  i_tvalid && i_tready && (state == IDLE) && (i_tdata[15:0] != SID);
+
+endmodule // axi_chdr_header_trigger