Merge branch 'fpga_next' into uhd_next

1 files changed, 55 insertions, 0 deletions

diff --git a/fpga/usrp2/top/N2x0/capture_ddrlvds.v b/fpga/usrp2/top/N2x0/capture_ddrlvds.v
new file mode 100644
index 000000000..e261dcbe8
--- /dev/null
+++ b/fpga/usrp2/top/N2x0/capture_ddrlvds.v
@@ -0,0 +1,55 @@
+//
+// 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 capture_ddrlvds
+  #(parameter WIDTH=7)
+   (input clk,
+    input ssclk_p,
+    input ssclk_n,
+    input [WIDTH-1:0] in_p,
+    input [WIDTH-1:0] in_n,
+    output reg [(2*WIDTH)-1:0] out);
+
+   wire [WIDTH-1:0] 	   ddr_dat;
+   wire 		   ssclk;
+   wire [(2*WIDTH)-1:0]    out_pre1;
+   reg [(2*WIDTH)-1:0] 	   out_pre2;
+   
+   IBUFGDS #(.IOSTANDARD("LVDS_33"), .DIFF_TERM("TRUE")) 
+   clkbuf (.O(ssclk), .I(ssclk_p), .IB(ssclk_n));
+   
+   genvar 	       i;
+   generate
+      for(i = 0; i < WIDTH; i = i + 1)
+	begin : gen_lvds_pins
+	   IBUFDS #(.IOSTANDARD("LVDS_33"),.DIFF_TERM("FALSE")) ibufds 
+	      (.O(ddr_dat[i]), .I(in_p[i]), .IB(in_n[i]) );
+	   IDDR2 #(.DDR_ALIGNMENT("C1")) iddr2
+	     (.Q0(out_pre1[2*i]), .Q1(out_pre1[(2*i)+1]), .C0(ssclk), .C1(~ssclk),
+	      .CE(1'b1), .D(ddr_dat[i]), .R(1'b0), .S(1'b0));
+	end
+   endgenerate
+
+   always @(posedge clk)
+     out_pre2 <= out_pre1;
+
+   always @(posedge clk)
+     out      <= out_pre2;
+   
+endmodule // capture_ddrlvds