Intel cPCI-7200 - Manual (Page 42)

34
• Operation Theory
3. I_REQ & I_ACK Handshaking
valid data D10~DI31 valid data
t1
t2
t5
t4 t3
IN I_REQ
IN I_ACK
t
1
≥ 0ns
t
5
≥ 60ns
t
3
≥ 2 PCI CLK Cycle
t
2
≥ 0ns
t
4
≥ 1 PCI CLK Cycle
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
Out O_REQ
t
cyc
t
h
t
s
D00~D031 valid data valid data
t
s
≥ 19ns
t
h
≥ 2 PCI CLK Cycles T
cyc
≥ 500ns