Merged r7611:7614 from jcorgan/gpio into trunk. Adds custom

[debian/gnuradio] / gr-gpio / src / fpga / lib / tx_chain_dig.v

diff --git a/gr-gpio/src/fpga/lib/tx_chain_dig.v b/gr-gpio/src/fpga/lib/tx_chain_dig.v
new file mode 100644 (file)
index 0000000..7001947
--- /dev/null
+++ b/gr-gpio/src/fpga/lib/tx_chain_dig.v
@@ -0,0 +1,42 @@
+// -*- verilog -*-
+//
+//  USRP - Universal Software Radio Peripheral
+//
+//  Copyright (C) 2008 Corgan Enterprises 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 2 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, write to the Free Software
+//  Foundation, Inc., 51 Franklin Street, Boston, MA  02110-1301  USA
+//
+
+module tx_chain_dig
+  (input clock,
+   input reset,
+   input enable,
+   input wire [15:0] i_in,
+   input wire [15:0] q_in,
+   output wire [15:0] i_out_ana,
+   output wire [15:0] q_out_ana,
+   output wire i_out_dig,
+   output wire q_out_dig
+   );
+
+   //assign upper 15 bits to analog processing, discard lowest bit
+   //output lower two bits of I and Q  as digital signal (to be output on gpio pins)
+   assign i_out_ana = (enable)?{i_in[15:1],1'b0}:i_in;
+   assign q_out_ana = (enable)?{q_in[15:1],1'b0}:q_in;
+   //wire out_dig   = (enable)?{i_in[0],q_in[0]}:2'b00;
+   assign i_out_dig = (enable)?i_in[0]:1'b0;
+   assign q_out_dig = (enable)?q_in[0]:1'b0;
+
+endmodule // tx_chain_dig