Easy xLogic - Page 58

56
56
56
56
(Symbol in xLogic)
The output of an AND with edge evaluation is only 1 if all
all
all
all inputs are 1 and at
at
at
at least
least
least
least one
one
one
one input
was 0 during the last cycle.
The output is set to 1 for the duration of one cycle and must be reset to 0 for the duration of the
next cycle before it can be set to 1 again.
A block input that is not used (x) is assigned: x = 1.
Timing diagram of an AND with edge evaluation
4
4
4
4 .2.3
.2.3
.2.3
.2.3 NAND
NAND
NAND
NAND
(Symbol in xLogic)
The output of an NAND function is only 0 if all
all
all
all inputs are 1, i.e. when they are closed.
A block input that is not used (x) is assigned: x = 1.
Logic table of the NAND block:
Input
Input
Input
Input 1
1
1
1 Input
Input
Input
Input 2
2
2
2 Input
Input
Input
Input 3
3
3
3 Input
Input
Input
Input 4
4
4
4 Output
Output
Output
Output
0 0 0 0 1
0 0 0 1 1
0 0 1 0 1
0 0 1 1 1
0 1 0 0 1
0 1 0 1 1
0 1 1 0 1
0 1 1 1 1
1 0 0 0 1