Measurement-computing Analyzer488 Instrukcja Użytkownika Pobierz pdf (Strona 39)

Section 2 Getting Started

2.17

Arm

Record

and

Trigger

Example # 3 Counted trigger word match with Delay

Match Word = LAG10, Match Count = 2, Trigger Delay = 32768,

Post Trigger Count = 32768 and Trigger Complete Action is Step

Buffer Location 0 32k16K8K 24k

Trigger

Match

Trigger

Match

Trigger

Point

Delay

Finished

Delay

Started

Disarm

Trigge

and

Set Ste

Handsh

For the diagram shown above, the trigger event was defined as follows:

Match Word = LAG10 (Listen Address Group 10), Match Count =

2,Trigger Delay = 32768, Post Count = 32768, and Trigger Complete

Action = Step.

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 32768 events were counted. At that time, the trigger event was

marked and recording continued until 32768 events were recorded. At that

time,recording was still enabled and the handshake circuitry was set to step

mode, halting bus transactions until a step command was issued. The

diagram shows that the event marked as the trigger point is stored at

location 0. The last event recorded in this case will be the last event

recorded before recording was disabled by issuing a command or by a

keypress.

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 280 281

Brak uwag

Measurement-computing Analyzer488 Instrukcja Użytkownika Strona 39