nand4_b.v

register,原程序及testbench,供初学者参考

`celldefine
module nand4_b(y,a,b,c,d);
input a,b,c,d;
output y;

nand (y, a, b, c, d);

specify
// Path Delays
    (a,b,c,d => y) = 1.27;

// Intrinsic characteristics that affect timing
    specparam cell_area=385.12,           // layout area
    	max_load$ = 0.5,		  // maximum load
    	resistance$y=1.6, slope$y=0.2,  capacitance$=0.044;
endspecify
endmodule
`endcelldefine