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//
// 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
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