ADLINK PCIe-7350 - Manual (Page 45)

Function Block and Operation Theory 35
3.7 Operation Mode
The PCIe-7350 supports four different modes for acquisition and
generation operation, including software polling, continuous,
handshaking, and burst handshaking mode..
3.7.1 Polling Mode (Single Read/Write)
The PCIe-7350 supports a software polling mode to read or write a
single chunk of data via a software command. That is, the 32-bit
high-speed I/O lines can be used as a static I/O. The data width
can be 8-bit, 16-bit, 24bit, or 32-bit.
3.7.2 DI DMA in Continuous Mode
For the DI pattern acquisition operation in continuous mode, PCIe-
7350 card can acquire input data from external devices at a spe-
cific sampling clock rate (DI sampled clock). DI sample clock can
be selected from internal or external clock source. The operation
sequences are listed as follows:
Steps:

Define DI port configuration (32/24/16/8-bits data width)

Define DI logic level configuration (3.3/2.5/1.8 V)

Define DI sample clock configuration (internal/external)

If choose internal sampled clock, you can define sam-
pling clock rate to be 100MHz/n (n = 2~65535)

If choose external sampled clock, the phase shift func-
tion is available when external clock is a free-running
clock (not a strobe signal) and external clock rate is from
2 MHz ~ 50 MHz.

Define DI starting mode configuration (NoWait or WaitTRIG)

If choose WaitTRIG, you can define start trigger source
to be software trigger or external trigger (DI-Start) from
AFI0 ~ AFI7.

Define DI data count

Execute DI DMA Read Command (continuous mode)