本帖最后由 hm_315 于 2014-3-9 10:38 编辑
小弟现在在做一些PLD关于GAL20V8的实验，做的是一个全加器，按照FM软件的格式写的程序ADD.PLD如下：GAL20V8
Full Adder
1 2 3 4 5 6 7 8 9 10 11 12
13 14 15 16 17 18 19 20 21 22 23 24
NC Xn Yn Cn-1 NC NC NC NC NC NC NC GND
NC NC Fn Cn NC NC NC NC NC NC NC VCC
Fn=Xn*/Yn*/Cn-1+/Xn*Yn*/Cn-1+/Xn*/Yn*Cn-1+Xn*Yn*Cn-1
Cn=Xn*Yn+Xn* Cn-1+Yn* Cn-1
DESCRIPTION
*L0
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0111011111111111111111111111111111111111
0111111101111111111111111111111111111111
1111011101111111111111111111111111111111
0000000000000000000000000000000000000000
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0111101110111111111111111111111111111111
1011011110111111111111111111111111111111
1011101101111111111111111111111111111111
0111011101111111111111111111111111111111
0000000000000000000000000000000000000000
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00000011
*L2632
11111100111111111111111111111111111111111111111111111111111111111111111110
*F8CC
通过查看GAL20V8 的手册，然后查看JED文件内容，第50行代码：
0111011111111111111111111111111111111111
那这行代码中全为1的部分，如果全部替代为0，作用是一样的吗？
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...这个不知道有没有过时很久。。。
