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Triggering on Waveforms
TDS 684A, TDS 744A, & TDS 784A User Manual
3–63
does not become stable long enough before the clock (setup time violation) or
that does not stay stable long enough after the clock (hold time violation).
Clock Signal
Clock Level
T
S
= Setup Time
T
H
= Hold Time
Setup/Hold Violation Zone = T
S
+ T
H
T
S
+ T
H
must be w +2 ns
Clock Signal
Clock Level
Clock Signal
Clock Level
Negative T
S;
Positive T
H
Positive T
S
; Negative T
H
+T
H
+T
H
–T
S
–T
H
+T
S
+T
S
Setup/Hold
Violation
Zone
Setup/Hold
Violation
Zone
Setup/Hold
Violation
Zone
Figure 3–38: Violation Zones for Setup/Hold Triggering
Negative settings for setup or hold times skew the setup/hold violation zone to
locate it before or after the clocking edge. (See the bottom and center waveforms