Unformatted text preview: e: Off-path inputs cannot be set to required
0 or 1 Stuck-at faults here
are not testable
Spring 2014, Feb 5 . . . Unensitized path
ELEC 7770: Advanced VLSI Design (Agrawal) 4 Dynamically Sensitized Path
Dynamically Definition: A dynamic signal can be propagated
Definition: through a statically unsensitizable path.
Example: See later. Spring 2014, Feb 5 . . . ELEC 7770: Advanced VLSI Design (Agrawal) 5 False and True Paths A ffalse path cannot propagate an event and hence
alse cannot affect the timing of the circuit. False paths are
Dynamically sensitizable path (true path): All off-path
inputs must settle down to their non-controlling values
when the event propagates through the path.
0 d1 True path of length 3 e
2 1 1 y f 1 1 3 0 Spring 2014, Feb 5 . . .
Spring ELEC 7770: Advanced VLSI Design (Agrawal) 1
True path of
length 4 z 6 Static Sensitization of Path Static sensitization of path: All off-path inputs can be
Static simultaneously set to their non-controlling values.
Longest path in the following example...
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- Spring '14
- 11:11, Critical path method, sensitization, Delay calculation