30 •• Operation Theorem
3. I_REQ & I_ACK Handshaking
IN_REQ
t
1
t
2
t
3
valid data
valid data
t
5
t
4
DI0~DI31
t
1 0ns
t
5
60ns
t
2
0ns
t
4
t
3
2 PCI CLK Cycle
IN_ACK
1 PCI CLK Cycle
4. O_REQ as output data strobe
OUT_REQ
t
h
t
cyc
valid data
valid data
t
s
D00~D031
t
s 19ns
t
h
500ns
tcyc
2 PCI CLK Cycles
==
