4 Operation
• T h e sample causing a
Trigger
is always stored.
• I f no stated follow an
If .. then, Trigger
in the sequencer program, like in
the default program, an implicit jump to a state where the prevailing store
condition is repeated takes place. This is to avoid storing both the specified
store condition and the trigger condition if the trigger condition should
occur again (according to the above rule saying that trigger samples are
stored.)
• A n implicit
Else Goto "current state"
is always present after an "If-Elsif'
sequence if no "Else" is specified, so that the If-test will always repeat
itself if none of the conditions were met.
• G o t o "next state" is implicit after a then or after an Else, where next state
is the state belonging to the next line containing an
If.
Loose and Tight sequence
A loose sequence is defined as a sequence of events (bus cycles) that simply
occur sequentially, without any constraints on other events appearing in
between. For example, the events A,B,C and D come in a loose sequence if
they occur mixed with the events X and Y like
A- B - X - C - Y - D .
The following sequencer program will trigger on a loose sequence of the events
A,B,C and D:
1 . a : I f ( A ) t h e n
2 . a
I
f
( B ) t h e n
3 . a
I
f
( C ) t h e n
4 . a
I
f
( D ) t h e n
4 . b
T
r
i
g
g
e
r
a t . .
On the other hand, a
tight sequence
is defined as a sequence of events (bus
cycles) that occur
without
any other event appearing in between, strictly like
A- B - C - D .
The trigger sequencer on the VBT-325 can be programmed to trigger on tight
sequences by using
'Goto l '
and
'Goto 2'
operators as shown on the next page.
1 . a : I f ( A ) t h e n
2 . a :
I
f
( B ) t h e n
3 . a :
I
f
( C ) t h e n
4 . a :
I
f
( D ) t h e n
VMETRO
V
B
T
-
3
2
5
User's Manual
5
7
Summary of Contents for VBAT-PB
Page 15: ...x i v 1 1 I 1 1 I I i i I I 1 I I 1 I 1 I I ...
Page 23: ...1VBT 325 Product overview 8 V B T 3 2 5 User s Manual V M E T R O ...
Page 125: ...8 Trace examples 110 V B T 3 2 5 User s Manual V M E T R O ...
Page 144: ...9 VBAT PB VME bus anomaly trigger ITP40 I GND VMETRO V B T 3 2 5 User s Manual 1 2 9 ...
Page 159: ...1 1Jumper settings 144 V B T 3 2 5 User s Manual V M E T R O ...
Page 181: ...16 Simulator for PC 166 V B T 3 2 5 User s Manual V M E T R O ...
