LDP.v 632 Bytes
// $Header: /root/leakn64/depot/rf/hw/debug/xilinx/LDP.v,v 1.1 2003/04/01 21:47:34 berndt Exp $

/*

FUNCTION	: D-LATCH with async preset

*/

`timescale  100 ps / 10 ps


module LDP (Q, D, G, PRE);

    parameter INIT = 1'b1;

    output Q;
    reg    q_out;

    input  D, G, PRE;

    tri0 GSR = glbl.GSR;

    buf B1 (Q, q_out);

	always @(GSR or PRE or D or G)
	    if (GSR)
		q_out <= INIT;
	    else if (PRE)
		q_out <= 1;
	    else if (G)
		q_out <= D;

    specify
	if (!PRE && G)
	    (D +=> Q) = (1, 1);
	if (!PRE)
	    (posedge G => (Q +: D)) = (1, 1);
	(posedge PRE => (Q +: 1'b1)) = (1, 1);
    endspecify

endmodule