ADLINK PCI-7300A - Manual (Page 47)

Operation Theory
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8. The data saved in FIFO will transfer to system memory of your computer
directly and automatically by bus mastering DMA.
The operation flow is show as below:
The following figure shows the timing requirement of the handshaking mode
digital input operation.
DIREQ & DIACK Handshaking
Note: DIREQ must be asserted until DIACK asserts, DIACK will be asserted
until DIREQ de-asserted.