Intel cPCI-7200 - Manual (Page 43)

Operation Theory
• 35
5. O_REQ & O_ACK Handshaking
OUT_REQ
t
1
t
3
valid data DO0~Do31
t
1 19ns
t
3
t
2
1 PCI CLK Cycle
OUT_ACK
5 PCI CLK Cycle
valid data
t
2
Note:
O_ACK must be de-asserted before O_REQ asserts, O_ACK can be
asserted any time after O_REQ asserts, O_REQ will be reasserted
after O_ACK is asserted.
O_REQ
O_ACK