User`s guide

42 • Operation Theory

Figure 12. Post Trigger timing

Under pre-trigger or post-trigger control schemes, the TRGEVENT flag signal

(Base + 0Ch) can come in handy. When the pre-trigger or post-trigger signal is

inserted, the TRGEVENT will be set to 1. After an acquisition or before the

next trigger signal is inserted, the trigger event flag (TRGEVENT, Base + 0Ah)

most be cleared by the user in order to set the correct flag status for the next

incoming trigger event.

Note that either the pre-trigger mode or post-trigger mode can be enabled at

any one time and not both. The post-trigger mode is only available with

hardware revision B2.

Time

POTRG Signal

Disable the A/D trigger source and set the

Post-trigger ON.

2. Set up A/D acquire mode.

Reset FIFO.

4. Enable A/D trigger

source.

5. Post

trigger signal assert.

6. Disable A/D trigger source

to stop acquiring data.

A/D conversion

signal