bufg_clk2x_fb_subm.v

xilinx DCM 应用的源代码

//
// Module:      BUFG_CLK2X_FB_SUBM
//
// Description: Verilog Submodule
//  DCM with CLK2X internal and external (board level) deskew.
//  
// Device:  Spartan-3 Family 
//
//---------------------------------------------------------------------

module BUFG_CLK2X_FB_SUBM ( 
                           CLK_IN,
                           RST,
                           CLKFB,
                           CLK2X_EXT,
                           CLK2X_INT,
                           LOCK_EXT,
                           LOCK_INT
                          );

    input CLK_IN;
    input RST;
    input CLKFB;
  
    output CLK2X_EXT;
    output CLK2X_INT;
    output LOCK_EXT;
    output LOCK_INT;

    wire CLK_IN_W;
    wire CLKFB_W;
    wire CLK2X_INT_W;
    wire GND;

    assign GND = 1'b0;

    // IBUFG Instantiation for CLK_IN//
    IBUFG U_IBUFG0 (
                    .I(CLK_IN),
                    .O(CLK_IN_W) 
                   );
       

    // IBUFG Instantiation for CLKFB//
    IBUFG U_IBUFG1 ( 
                    .I(CLKFB),
                    .O(CLKFB_W)
                   );

    // BUFG Instantiation for internal clock distribution//
    BUFG U_BUFG (  
                 .I(CLK2X_INT_W),
                 .O(CLK2X_INT)
                );
 
    // Attributes for functional simulation//
    // synopsys translate_off
     defparam U0_DCM.CLK_FEEDBACK = "2X";
     defparam U1_DCM.CLK_FEEDBACK = "2X";
     defparam U0_DCM.DLL_FREQUENCY_MODE = "LOW";
     defparam U1_DCM.DLL_FREQUENCY_MODE = "LOW";
     defparam U0_DCM.DUTY_CYCLE_CORRECTION = "TRUE";
     defparam U1_DCM.DUTY_CYCLE_CORRECTION = "TRUE";
     defparam U0_DCM.STARTUP_WAIT = "FALSE";
     defparam U1_DCM.STARTUP_WAIT = "FALSE";
    // synopsys translate_on

    // Instantiate the DCM primitive//
     DCM U0_DCM ( 
                 .CLKFB(CLKFB_W), 
                 .CLKIN(CLK_IN_W), 
                 .DSSEN(GND), 
                 .PSCLK(GND), 
                 .PSEN(GND), 
                 .PSINCDEC(GND), 
                 .RST(RST), 
                 .CLK2X(CLK2X_EXT),   
                 .LOCKED(LOCK_EXT)
                );

     DCM U1_DCM ( 
                 .CLKFB(CLK2X_INT), 
                 .CLKIN(CLK_IN_W), 
                 .DSSEN(GND), 
                 .PSCLK(GND), 
                 .PSEN(GND), 
                 .PSINCDEC(GND), 
                 .RST(RST), 
                 .CLK2X(CLK2X_INT_W),  
                 .LOCKED(LOCK_INT)
                ); 
                    

    // synthesis attribute declarations
     /* synopsys attribute
     CLK_FEEDBACK "2X"
     DLL_FREQUENCY_MODE "LOW"
     DUTY_CYCLE_CORRECTION "TRUE"
     STARTUP_WAIT "FALSE"
     */
endmodule