From ca02bf0358677043fb5d594a0f12413ba242c892 Mon Sep 17 00:00:00 2001
From: Matt Ettus <matt@ettus.com>
Date: Fri, 4 Nov 2011 14:45:32 -0700
Subject: dsp: remove dsp_buffer and replace with simpler add_routing_header,  
 other funcs of dsp_buffer are done by double_buffer and dsp_engine

---
 usrp2/fifo/Makefile.srcs        |  1 +
 usrp2/fifo/add_routing_header.v | 47 +++++++++++++++++++++++++++++++++++++++++
 usrp2/vrt/vita_rx_chain.v       |  5 ++---
 3 files changed, 50 insertions(+), 3 deletions(-)
 create mode 100644 usrp2/fifo/add_routing_header.v

diff --git a/usrp2/fifo/Makefile.srcs b/usrp2/fifo/Makefile.srcs
index 02c567049..28d506571 100644
--- a/usrp2/fifo/Makefile.srcs
+++ b/usrp2/fifo/Makefile.srcs
@@ -6,6 +6,7 @@
 # FIFO Sources
 ##################################################
 FIFO_SRCS = $(abspath $(addprefix $(BASE_DIR)/../fifo/, \
+add_routing_header.v \
 buffer_int.v \
 buffer_int2.v \
 buffer_pool.v \
diff --git a/usrp2/fifo/add_routing_header.v b/usrp2/fifo/add_routing_header.v
new file mode 100644
index 000000000..ee6a635f5
--- /dev/null
+++ b/usrp2/fifo/add_routing_header.v
@@ -0,0 +1,47 @@
+//
+// Copyright 2011 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+module add_routing_header
+  #(parameter PORT_SEL = 0,
+    parameter PROT_ENG_FLAGS = 1)
+   (input clk, input reset, input clear,
+    input [35:0] data_i, input src_rdy_i, output dst_rdy_o,
+    output [35:0] data_o, output src_rdy_o, input dst_rdy_i);
+
+   reg [1:0] 	  line;
+   wire [1:0] 	  port_sel_bits = PORT_SEL;
+   wire [15:0] 	  len = data_i[15:0];
+   
+   always @(posedge clk)
+     if(reset)
+       line <= PROT_ENG_FLAGS ? 0 : 1;
+     else
+       if(src_rdy_o & dst_rdy_i)
+	 if(data_o[33])
+	   line <= PROT_ENG_FLAGS ? 0 : 1;
+	 else
+	   if(line != 3)
+	     line <= line + 1;
+
+   assign data_o = (line == 0) ? {4'b0001, 13'b0, port_sel_bits, 1'b1, len[13:0],2'b00} :
+		   (line == 1) ? {3'b000, (PROT_ENG_FLAGS ? 1'b0: 1'b1), data_i[31:0]} : 
+		   data_i[35:0];
+
+   assign dst_rdy_o = dst_rdy_i & (line != 0);
+   assign src_rdy_o = src_rdy_i;
+   
+endmodule // add_routing_header
diff --git a/usrp2/vrt/vita_rx_chain.v b/usrp2/vrt/vita_rx_chain.v
index 63e1e45dd..8b41e5fa8 100644
--- a/usrp2/vrt/vita_rx_chain.v
+++ b/usrp2/vrt/vita_rx_chain.v
@@ -72,9 +72,8 @@ module vita_rx_chain
       .access_skip_read(access_skip_read), .access_adr(access_adr), .access_len(access_len), 
       .access_dat_i(buf_to_dsp), .access_dat_o(dsp_to_buf));
    
-   dsp_framer36 #(.BUF_SIZE(FIFOSIZE), 
-		  .PORT_SEL(UNIT), 
-		  .PROT_ENG_FLAGS(PROT_ENG_FLAGS)) dsp0_framer36
+   add_routing_header #(.PORT_SEL(UNIT), 
+			.PROT_ENG_FLAGS(PROT_ENG_FLAGS)) dsp_routing_header
      (.clk(clk), .reset(reset), .clear(clear),
       .data_i(rx_data_int2), .src_rdy_i(rx_src_rdy_int2), .dst_rdy_o(rx_dst_rdy_int2),
       .data_o(rx_data_o), .src_rdy_o(rx_src_rdy_o), .dst_rdy_i(rx_dst_rdy_i) );
-- 
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