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4-17
(b) Asynchronous transler from initiator to target
If the I/O signal is false (transfer to the target), the target shall request information by asserting the
REQ signal. The initiator shall drive the DB (7-0, P) signals to their desired values, delay at least
one deskew delay plus a cable skew delay then assert the ACK signal. The initiator shall continue
to drive the DB (7-0, P) signals until the REQ signal is false. When the ACK signal becomes true
at the target, the target shall read the DB (7-0, P) signals then negate the REQ signal. When the
REQ signal becomes false at the Initiator, the initiator may change or release the DB (7-0, P)
signals and shall negate the ACK signal. The target may continue the transfer by asserting the
REQ signal, as previously described.
Bus settle delay
deskew delay +
cable skew delay
deskew delay +
cable skew delay
BSY
SEL
I/O
REQ
ACK
DB
C/D,MSG