Easy xLogic - Page 59

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4
4
4
4 .2.4
.2.4
.2.4
.2.4 NAND
NAND
NAND
NAND with
with
with
with edge
edge
edge
edge evaluation
evaluation
evaluation
evaluation
The output of a NAND with edge evaluation is only 1 at
at
at
at least
least
least
least one
one
one
one input is 0 and all
all
all
all inputs were
1 during the last cycle.
The output is set to 1 for the duration of one cycle and must be reset to 0 at least 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 a NAND with edge evaluation
4
4
4
4 .2.5
.2.5
.2.5
.2.5 OR
OR
OR
OR
1 0 0 1 1
1 0 1 0 1
1 0 1 1 1
1 1 0 0 1
1 1 0 1 1
1 1 1 0 1
1 1 1 1 0