ADLINK PCI-7200 - Manual (Page 51)

Operation Theory 39
3. I_REQ & I_ACK Handshaking
Note: I_REQ must be asserted until I_ACK asserts, I_ACK will be
asserted until I_REQ de-asserts.
4. O_REQ as output data strobe
5. O_REQ & O_ACK Handshaking
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.
t1
≥
0ns t5
≥
60ns t3
≥
2 PCI CLK Cycle
t2
≥
0ns t4
≥
1 PCI CLK Cycle
ts
≥
19ns th
≥
2 PCI CLK Cycles Tcyc
≥
500ns
valid data D10~DI31 valid data
t1
t2
t5
t4 t3
IN I_REQ
IN I_ACK