Fujitsu Scan Partner 300C Instruction Manual page 43

BSY
SEL
C/D,MSG
I/O
REQ
ACK
DB
(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
4-17
deskew delay +
cable skew delay