ADLINK PCI-9527 - Manual (Page 48)

36 Operation Theory
PCI-9527 ADLINK Technology Inc.
User’s Manual Copyright 2010
3.5.3 Timing Constraint When AI and AO Enabled Simul-
taneously
As users can see in the section 3.5.1, the ADC and DAC shares
the same Timebase source, i.e. the output of DDS clock. When
users enable the operation of ADC and DAC at the same time,
there are constraints that should be kept in mind:
1. The sampling rate of ADC and the update rate of DAC
are related. When you set the sampling rate of ADC to
certain value before configure DAC, the update rate of
DAC will be limited and fixed corresponding to the sam-
ple rate of ADC. When you set the update rate of DAC to
certain value before configure ADC, the sampling rate of
DAC will be limited and fixed corresponding to the
update rate of DAC. Please refer to following table for
detail.
2. Because the ADC and DAC share the same trigger
source, users have to configure both AI and AO opera-
tion before trigger event occurs. On the other words, trig-
ger event cannot occur before AI & AO configuration
complete.