Measurement-computing Analyzer488 Manual do Utilizador descarregar pdf (Página 38)

Section 2 Getting Started

2.16

Arm

Record

and

Trigger

Disarm

Record

and

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 Trigger Complete Action is Stop

Buffer Location

0 32k16K8K 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.

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Measurement-computing Analyzer488 Manual do Utilizador Página 38