ADLINK PCI-7300A - Manual (Page 51)

Operation Theory
• 43
The operation flow is show as below:
The timing diagram of the DOREQ and DOACK in the DO handshaking mode
is shown as follows:
DOREQ & DOACK Handshaking
Note: DOACK must be deserted before DOREQ asserts, DOACK can be
asserted any time after DOREQ asserts, DOREQ will be reasserted
after DOACK is asserted.