ADLINK PCI-9810 - Manual (Page 50)

38 Operation Theory
5.5 Data Transfer
Data Transfer
There are several function blocks on the PCI-9812/9810 designed
to acquire AD data. Even as the maximum sampling rate is
specified at up to 20 MHz, there are certain limitations due to the
high total data throughput. Refer to the data transfer diagram
below to understand how analog signal is converted to digital form
and transferred to the host computer’s memory. The data transfer
rate limitation and bottleneck are discussed in this section.
Figure 5-5: Data Transfer Diagram of PCI-9812/9810
Simultaneous Sampling of Four AD Channels
The PCI-9812/9810 is equipped with four AD converters that
support a maximum 20 MHz simultaneous sampling rate.
For single-channel applications, only channel 0 can be selected
with a total FIFO length of 32K samples. For simultaneous two-
channel applications, use channel 0 and channel 1 to optimize
FIFO usage. The onboard circuit does not allow use of channel 0
and 2 or channel 2 and 3 simultaneously. Take note that the card
only supports 2 or 4 channels for simultaneous sampling
applications.