diff options
Diffstat (limited to 'fpga/usrp2/top/N2x0/capture_ddrlvds.v')
| -rw-r--r-- | fpga/usrp2/top/N2x0/capture_ddrlvds.v | 55 |
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 |