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Reading Databook Symbols
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**Symbol** **Definition**
0          Logic Low
1          Logic High
HL         High to Low Transition
LH         Low to High Transition
↑          Positive Clock Edge
↓          Negative Clock edge
Tin        Input Transition 30 to70 %
Delay      50 to 50%
Tout       Output Transition 30 to 70%
?          Don't Care (Combinatorial Cells)
X          Don't Care (Sequential Cells)
default    No “when” condition for Input
n/a        No Transition
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