Merged r5732:5941 from jcorgan/sar into trunk. Adds start of gr-radar-mono component...

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

diff --git a/gr-radar-mono/src/fpga/lib/dac_interface.v b/gr-radar-mono/src/fpga/lib/dac_interface.v
new file mode 100644 (file)
index 0000000..209aebd
--- /dev/null
+++ b/gr-radar-mono/src/fpga/lib/dac_interface.v
@@ -0,0 +1,60 @@
+// -*- verilog -*-\r
+//\r
+//  USRP - Universal Software Radio Peripheral\r
+//\r
+//  Copyright (C) 2007 Corgan Enterprises LLC\r
+//\r
+//  This program is free software; you can redistribute it and/or modify\r
+//  it under the terms of the GNU General Public License as published by\r
+//  the Free Software Foundation; either version 2 of the License, or\r
+//  (at your option) any later version.\r
+//\r
+//  This program is distributed in the hope that it will be useful,\r
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of\r
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
+//  GNU General Public License for more details.\r
+//\r
+//  You should have received a copy of the GNU General Public License\r
+//  along with this program; if not, write to the Free Software\r
+//  Foundation, Inc., 51 Franklin Street, Boston, MA  02110-1301  USA\r
+//\r
+\r
+`include "../top/config.vh"\r
+\r
+module dac_interface(clk_i,rst_i,ena_i,strobe_i,tx_i_i,tx_q_i,tx_data_o,tx_sync_o);\r
+   input clk_i;\r
+   input rst_i;\r
+   input ena_i;\r
+   input strobe_i;\r
+   \r
+   input [13:0] tx_i_i;\r
+   input [13:0] tx_q_i;\r
+\r
+   output [13:0] tx_data_o;\r
+   output       tx_sync_o;\r
+\r
+`ifdef TX_RATE_MAX\r
+   wire clk128;\r
+   reg clk64_d;\r
+   reg [13:0] tx_data_o;\r
+   \r
+   // Create a 128 MHz clock\r
+   dacpll pll128(.areset(rst_i),.inclk0(clk_i),.c0(clk128));\r
+\r
+   // Register the clk64 clock in the clk128 domain\r
+   always @(posedge clk128)\r
+     clk64_d <= clk_i;\r
+\r
+   // Register the tx data in the clk128 domain\r
+   always @(posedge clk128)\r
+     tx_data_o <= clk64_d ? tx_i_i : tx_q_i;\r
+\r
+   assign tx_sync_o = clk64_d;\r
+   \r
+\r
+`else // !`ifdef TX_RATE_MAX\r
+   assign tx_data_o = strobe_i ? tx_i_i : tx_q_i;\r
+   assign tx_sync_o = strobe_i;\r
+`endif // !`ifdef TX_RATE_MAX\r
+   \r
+endmodule // dac_interface\r