Merged r5033:5116 from developer branch jcorgan/snd, with minor edits. Trunk passes...

[debian/gnuradio] / gr-sounder / src / fpga / lib / dac_interface.v

diff --git a/gr-sounder/src/fpga/lib/dac_interface.v b/gr-sounder/src/fpga/lib/dac_interface.v
new file mode 100644 (file)
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+++ b/gr-sounder/src/fpga/lib/dac_interface.v
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+// -*- verilog -*-
+//
+//  USRP - Universal Software Radio Peripheral
+//
+//  Copyright (C) 2007 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
+//
+
+`include "../top/config.vh"
+
+module dac_interface(clk_i,rst_i,ena_i,strobe_i,tx_i_i,tx_q_i,tx_data_o,tx_sync_o);
+   input clk_i;
+   input rst_i;
+   input ena_i;
+   input strobe_i;
+   
+   input [15:0] tx_i_i;
+   input [15:0] tx_q_i;
+
+   output [15:0] tx_data_o;
+   output       tx_sync_o;
+
+`ifdef TX_RATE_MAX
+   wire clk128;
+   reg clk64_d;
+   reg [15:0] tx_data_o;
+   
+   // Create a 128 MHz clock
+   dacpll pll128(.areset(rst_i),.inclk0(clk_i),.c0(clk128));
+
+   // Register the clk64 clock in the clk128 domain
+   always @(posedge clk128)
+     clk64_d <= clk_i;
+
+   // Register the tx data in the clk128 domain
+   always @(posedge clk128)
+     tx_data_o <= clk64_d ? tx_i_i : tx_q_i;
+
+   assign tx_sync_o = clk64_d;
+   
+
+`else // !`ifdef TX_RATE_MAX
+   assign tx_data_o = strobe_i ? tx_q_i : tx_i_i;
+   assign tx_sync_o = strobe_i;
+`endif // !`ifdef TX_RATE_MAX
+   
+endmodule // dac_interface