// $Header: /root/leakn64/depot/rf/hw/debug/xilinx/NOR4B4.v,v 1.1 2003/04/01 21:47:34 berndt Exp $

/*

FUNCTION	: 4-INPUT NOR GATE

*/

`timescale  100 ps / 10 ps


module NOR4B4 (O, I0, I1, I2, I3);

    output O;

    input  I0, I1, I2, I3;

    not N3 (i3_inv, I3);
    not N2 (i2_inv, I2);
    not N1 (i1_inv, I1);
    not N0 (i0_inv, I0);
    nor O1 (O, i0_inv, i1_inv, i2_inv, i3_inv);

    specify
	(I0 *> O) = (1, 1);
	(I1 *> O) = (1, 1);
	(I2 *> O) = (1, 1);
	(I3 *> O) = (1, 1);
    endspecify

endmodule