Vmetro VBAT-PB, Руководство пользователя

Страница: 101 / 186

6 Commands reference
Note that it is not necessary to enter the sequencer for simple triggers without
any store qualifiers, since the default "Single Event Mode" automatically
selects the event pointed to in the Event patterns window to be the trigger.
Trigger position
The Tr i g g e r P o s i t i o n ' i s defined in a secondary
pull-down menu, with selections for Start (0%), 25%,
Middle (50%), 75% and End (100%) of trace.
The selected sampling mode and trigger position is
reflected in the Sequencer program.
S t a r t o f t r a c c !
* 25% o f t r a c e
Biddle o f t r a c e
75% o f t r a c e
End o f t r a c e
Sampling mode
' Sampling mode' is selected in a secondary pull-down menu, and allows
the user to select State (synchronous) or Timing (asynchronous) sampling.
* S t a t e
§O KHz Timing
p p t i o n s
There is also an ' Opt ions ' sub-command
which allows the user to select other timing
sampling rates, down to 97.7KHz. The
selected sampling rate is the one that appears
in the secondary menu next time the
Sampling mode command is entered.
S t a t e • . t i o n s
50 MHz Timing
25 MHz Timing
6.25 Nilo Timing
1.56 MHz Timing
781_3 M e Timing
390.6 KHz Timing
1 / 5 . 3 KHz Timing
97.7 KHz Timing
Options / State Sampling options
This command controls whether the BR* and IRQ* signals shall be stretched
for capture on DTACK*BERR* in VMEbus state sampling. It also controls the
Limited/Extended time tag options vs. the availability of the four external
signals In3:0 in the trace. Please refer to FUNCTIONAL DESCRIPTION,
External Inputs, Shared In3:0 and Time Tag bits.
86 V B T - 3 2 5 User's Manual V M E T R O