含有 Dalay 的 nand gate 實作

module top ;reg a , b ;wire c ;nanf201 G1(c,a,b);
initialbegin a = 0 ;b = 0 ;#400 $finish ;end
always#40 a = ~ a ;
always#80 b = ~ b ;
endmodule
module nanf201(O, A1, B1);input A1, B1;output O;
nand(O, A1,B1);
specifyspecparamTpd_0_1 = 1.13:3.09:7.75,Tpd_1_0 = 0.93:2.50:7.34;
(A1=>O) = (Tpd_0_1, Tpd_1_0);(B1=>O) = (Tpd_0_1, Tpd_1_0);
endspecify
endmodule