udp: checkpoint

2 files changed, 87 insertions, 31 deletions

diff --git a/usrp2/udp/ethtx_realign.v b/usrp2/udp/ethtx_realign.v
index c98d34cf4..e0987e408 100644
--- a/usrp2/udp/ethtx_realign.v
+++ b/usrp2/udp/ethtx_realign.v
@@ -1,24 +1,72 @@
 
+// NOTE:  Will not work with single-line frames
+
 module ethtx_realign
    (input clk, input reset, input clear,
     input [35:0] datain, input src_rdy_i, output dst_rdy_o,
     output [35:0] dataout, output src_rdy_o, input dst_rdy_i);
 
-   reg 		  state;
+   reg [1:0] 	  state;
+   reg [15:0] 	  held;
+   reg [1:0] 	  held_occ;
+	  
+   wire 	  xfer_in = src_rdy_i & dst_rdy_o;
+   wire 	  xfer_out = src_rdy_o & dst_rdy_i;
 
+   wire 	  sof_in = datain[32];
    wire 	  eof_in = datain[33];
    wire [1:0] 	  occ_in = datain[35:34];
-   
+   wire 	  sof_out, eof_out;
+   wire [1:0] 	  occ_out;
+      
    always @(posedge clk)
      if(reset | clear)
-       state <= 0;
-     else if
-       
-   assign dataout[15:0] = datain[31:16];
-   assign dataout[31:16] = stored;
+       begin
+	  held <= 0;
+	  held_occ <= 0;
+       end
+     else if(xfer_in)
+       begin
+	  held <= datain[15:0];
+	  held_occ <= datain[35:34];
+       end
+   
+   localparam RE_IDLE = 0;
+   localparam RE_HELD = 1;
+   localparam RE_DONE = 2;
 
    always @(posedge clk)
-     stored <= datain[15:0];
+     if(reset | clear)
+       state <= RE_IDLE;
+     else
+       case(state)
+	 RE_IDLE :
+	   if(src_rdy_i & dst_rdy_i)
+	      if(eof_in)
+		state <= RE_DONE;
+	      else
+		state <= RE_HELD;
 
+	 RE_HELD :
+	   if(src_rdy_i & dst_rdy_i & eof_in)
+	     if((occ_in==0)|(occ_in==3))
+	       state <= RE_DONE;
+	     else
+	       state <= RE_IDLE;
 
+	 RE_DONE :
+	   if(dst_rdy_i)
+	     state <= RE_IDLE;
+	 
+       endcase // case (state)
+   
+   
+   assign sof_out = (state == RE_IDLE);
+   assign eof_out = (state == RE_DONE) | (occ_in == 1) | (occ_in == 2);
+   assign occ_out = (state == RE_DONE) ? ((held_occ == 3) ? 1 : 2) :
+		    (occ_in == 1) ? 3 : 0;
+   		    
+   assign dataout = {occ_out,eof_out,sof_out,held,datain[31:16]};
+   assign src_rdy_o = (state == RE_DONE) | src_rdy_i;
+   assign dst_rdy_o = dst_rdy_i & ((state == RE_IDLE)|(state == RE_HELD));
 endmodule // ethtx_realign
diff --git a/usrp2/udp/prot_eng_tx_tb.v b/usrp2/udp/prot_eng_tx_tb.v
index c8fffe605..11d858d87 100644
--- a/usrp2/udp/prot_eng_tx_tb.v
+++ b/usrp2/udp/prot_eng_tx_tb.v
@@ -8,39 +8,47 @@ module prot_eng_tx_tb();
    always #50 clk = ~clk;
    
    reg [31:0] f36_data;
-   reg [1:0] f36_occ;
-   reg f36_sof, f36_eof;
-   
+   reg [1:0]  f36_occ;
+   reg 	      f36_sof, f36_eof;
    wire [35:0] f36_in = {f36_occ,f36_eof,f36_sof,f36_data};
-   reg src_rdy_f36i  = 0;
-   reg [15:0] count;
+   reg 	       src_rdy_f36i  = 0;
+   wire        dst_rdy_f36i;
+
 
    wire [35:0] casc_do;
-   wire [18:0] final_out, prot_out;
+   wire        src_rdy_f36o, dst_rdy_f36o;
 
-   wire src_rdy_final, dst_rdy_final, src_rdy_prot;
-   reg dst_rdy_prot =0;
-   
-   wire dst_rdy_f36o ;
-   fifo_long #(.WIDTH(36), .SIZE(4)) fifo_cascade36
-     (.clk(clk),.reset(rst),.clear(clear),
-      .datain(f36_in),.src_rdy_i(src_rdy_f36i),.dst_rdy_o(dst_rdy_f36i),
-      .dataout(casc_do),.src_rdy_o(src_rdy_f36o),.dst_rdy_i(dst_rdy_f36o));
+   wire [35:0] prot_out;
+   wire        src_rdy_prot, dst_rdy_prot;
 
-   fifo36_to_fifo19 fifo_converter
-     (.clk(clk),.reset(rst),.clear(clear),
-      .f36_datain(casc_do),.f36_src_rdy_i(src_rdy_f36o),.f36_dst_rdy_o(dst_rdy_f36o),
-      .f19_dataout(final_out),.f19_src_rdy_o(src_rdy_final),.f19_dst_rdy_i(dst_rdy_final));
+   wire [35:0] realign_out;
+   wire        src_rdy_realign;
+   reg 	       dst_rdy_realign = 1;
+      
+   reg [15:0] count;
 
    reg set_stb;
    reg [7:0] set_addr;
    reg [31:0] set_data;
 	
+   fifo_short #(.WIDTH(36)) fifo_cascade36
+     (.clk(clk),.reset(rst),.clear(clear),
+      .datain(f36_in),.src_rdy_i(src_rdy_f36i),.dst_rdy_o(dst_rdy_f36i),
+      .dataout(casc_do),.src_rdy_o(src_rdy_f36o),.dst_rdy_i(dst_rdy_f36o));
+
+   /*
    prot_eng_tx #(.BASE(BASE)) prot_eng_tx
-     (.clk(clk), .reset(rst),
+     (.clk(clk), .reset(rst), .clear(0),
       .set_stb(set_stb),.set_addr(set_addr),.set_data(set_data),
-      .datain(final_out[18:0]),.src_rdy_i(src_rdy_final),.dst_rdy_o(dst_rdy_final),
-      .dataout(prot_out[18:0]),.src_rdy_o(src_rdy_prot),.dst_rdy_i(dst_rdy_prot));
+      .datain(casc_do),.src_rdy_i(src_rdy_f36o),.dst_rdy_o(dst_rdy_f36o),
+      .dataout(prot_out),.src_rdy_o(src_rdy_prot),.dst_rdy_i(dst_rdy_prot));
+*/
+   
+   ethtx_realign ethtx_realign
+     (.clk(clk), .reset(rst), .clear(0),
+      //.datain(prot_out),.src_rdy_i(src_rdy_prot),.dst_rdy_o(dst_rdy_prot),
+      .datain(casc_do),.src_rdy_i(src_rdy_f36o),.dst_rdy_o(dst_rdy_f36o),
+      .dataout(realign_out),.src_rdy_o(src_rdy_realign),.dst_rdy_i(dst_rdy_realign));
    
    reg [35:0] printer;
 
@@ -61,7 +69,7 @@ module prot_eng_tx_tb();
    task ReadFromFIFO36;
       begin
 	 $display("Read from FIFO36");
-	 #1 dst_rdy_prot <= 1;
+	 #1 dst_rdy_realign <= 1;
 	 while(~src_rdy_prot)
 	   @(posedge clk);
 	 while(1)
@@ -162,7 +170,7 @@ module prot_eng_tx_tb();
 	@(posedge clk);
 	#10000;
 	@(posedge clk);
-	PutPacketInFIFO36(32'hE0F0A0B0,36);
+	//PutPacketInFIFO36(32'hE0F0A0B0,36);
 	@(posedge clk);
 	@(posedge clk);
 	@(posedge clk);