ADLINK PXI-2208 - Manual (Page 91)

Operation Theory 79
width of the TIMEBASE to guarantee correct functional-
ities.
4. ADCONV, the conversion signal to initiate a single con-
version, which could be derived from internal counter,
AFI[0] or SSI_ADCONV. Note that this signal is edge-
sensitive. When using AFI[0] as the external ADCONV
source, each rising edge of AFI[0] would bring an effec-
tive conversion signal. Also note that the AFI[0] signal
should be TTL-compatible and the minimum pulse width
is 20 ns.
5. DA_TRIG, the trigger signal for the D/A operation, which
could be derived from external digital trigger, analog trig-
ger, internal software trigger, and SSI_AD_TRIG. Refer
to section 4.5 for detailed description.
6. DAWR, the update signal to initiate a single D/A conver-
sion, which could be derived from internal counter,
AFI[1] or SSI_DAWR. Note that this signal is edge-sensi-
tive. When using AFI[1] as the external DAWR source,
each rising edge of AFI[1] would bring an effective
update signal. Also note that the AFI[1] signal should be
TTL-compatible and the minimum pulse width is 20 ns.