Subversion Repositories usb_fpga_2_14

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//*****************************************************************************
//   ____  ____
//  /   /\/   /
// /___/  \  /    Vendor: Xilinx
// \   \   \/     Version:%version
//  \   \         Application: MIG
//  /   /         Filename: clk_ibuf.v
// /___/   /\     Date Last Modified: $Date: 2011/06/02 08:34:56 $
// \   \  /  \    Date Created:Mon Aug 3 2009
//  \___\/\___\
//
//Device: Virtex-6
//Design Name: DDR3 SDRAM
//Purpose:
//   Clock generation/distribution and reset synchronization
//Reference:
//Revision History:
//*****************************************************************************
`timescale 1ns/1ps
 
module mig_7series_v2_3_clk_ibuf #
  (
   parameter SYSCLK_TYPE      = "DIFFERENTIAL",
                                // input clock type
   parameter DIFF_TERM_SYSCLK = "TRUE"
                                // Differential Termination
   )
  (
   // Clock inputs
   input  sys_clk_p,          // System clock diff input
   input  sys_clk_n,
   input  sys_clk_i,
   output mmcm_clk
   );
 
   (* KEEP = "TRUE" *) wire sys_clk_ibufg /* synthesis syn_keep = 1 */;
 
  generate
    if (SYSCLK_TYPE == "DIFFERENTIAL") begin: diff_input_clk
 
      //***********************************************************************
      // Differential input clock input buffers
      //***********************************************************************
 
      IBUFGDS #
        (
         .DIFF_TERM    (DIFF_TERM_SYSCLK),
         .IBUF_LOW_PWR ("FALSE")
         )
        u_ibufg_sys_clk
          (
           .I  (sys_clk_p),
           .IB (sys_clk_n),
           .O  (sys_clk_ibufg)
           );
 
    end else if (SYSCLK_TYPE == "SINGLE_ENDED") begin: se_input_clk
 
      //***********************************************************************
      // SINGLE_ENDED input clock input buffers
      //***********************************************************************
 
      IBUFG #
        (
         .IBUF_LOW_PWR ("FALSE")
         )
        u_ibufg_sys_clk
          (
           .I  (sys_clk_i),
           .O  (sys_clk_ibufg)
           );
    end else if (SYSCLK_TYPE == "NO_BUFFER") begin: internal_clk
 
      //***********************************************************************
      // System clock is driven from FPGA internal clock (clock from fabric)
      //***********************************************************************
      assign sys_clk_ibufg = sys_clk_i;
   end
  endgenerate
 
  assign mmcm_clk = sys_clk_ibufg;
 
endmodule