ADLINK Technology cPCI-9116 Guia do Utilizador descarregar pdf (Página 53)

Operation Theory • 43

(M_Counter=M=3, DIV_Counter=4, SC_Counter=N=1)

Acquisition_in_progress

Scan_start

AD_conversion

Scan_in_progress

(

SSH_OUT

)(pin47)

Aquired data

Acquired & stored data

(M+N scans)

Operation start

ExtTrg(pin46)

M scans before

trigger

N scans

after trigger

Trigger signals which occur in the shadow

region(the first M scans) will be ignored

The first M scans

Figure 14: Middle trigger with M_enable = 1

If an external trigger event occurs when a scan is in progress, the stored N

scans of data would include this scan. And the first stored data will always

be the first channel entry of a scan, as illustrated in Fig 15.

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ADLINK Technology cPCI-9116 Guia do Utilizador Página 53