Measurement Computing Analyzer488 - Manual (Page 38)

Section 2 Getting Started
2.16
Arm
Record
and
Trigger
Disarm
Record
and
Trigger
Trigger
Match
Example # 2 Counted trigger word match with Pre-trigger
Match Word = LAG10, Match Count = 3, Trigger Delay = 0,
Post Trigger Count = 24576 and Tr igger Complete Action is Stop
Buffer Location
0 32k 16K 8K 24k
Trigger
Match
Trigger
Match
Trigger
Point
For the diagram shown above, the trigger event was defined as follows:
Match Word = LAG10 (Listen Address Group 10), Match Count =
3,Trigger Delay = 0, Post Count = 24576, and Trigger Complete Action =
Stop.
Once the trigger event was defined, recording and triggering were then
enabled. The Analyzer488 began recording bus transactions, comparing
each event with the defined match word. Each time the match word was
found, the Match Count was decremented. When the Match Count was
decremented to zero, the Analyzer488 began counting and recording bus
events until 24576 events were recorded. At that time, recording was
disabled. The diagram shows that the event marked as the trigger point is
stored at location 8192 and the last event recorded is stored in location
32767.