mac.abl

来自「自己编写的GAL可编程逻辑电路的编译软件abel4的windows界面」· ABL 代码 · 共 38 行

module mac 
title 'Demonstrates to difference between MACROs and declared equations'

        m1      device 'P16H8';

        A,B,C,X1,X2,X3  pin 1,2,3,14,15,16;

        Y1  macro {B # C};

        Y2 = B # C;

equations
        X1 = A & Y1;

        X2 = A & (Y1);

        X3 = A & Y2;

" Note: Because Y1 is a text replacement macro the equation
" for X1 will expand to  A & B # C. If the desired function
" was A & (B # C) use parentheses around the macro or use
" a sub expression in the declarations.

" The macro could also be written       Y1 macro {(B # C)};

test_vectors   ([A,B,C] -> [X1,X2,X3])
                [0,0,0] -> [ 0, 0, 0];
                [0,0,1] -> [ 1, 0, 0];
                [0,1,0] -> [ 0, 0, 0];
                [0,1,1] -> [ 1, 0, 0];
                [1,0,0] -> [ 0, 0, 0];
                [1,0,1] -> [ 1, 1, 1];
                [1,1,0] -> [ 1, 1, 1];
                [1,1,1] -> [ 1, 1, 1];


end