Fujitsu MBA3073 SERIES Technical Manual page 50

(1) ATN transmit setup time
The minimum time provided by the transmitter between the assertion of the ATN signal and the
negation of the ACK signal.
Specified to provide the increased ATN receive setup time, subject to intersymbol interference,
cable skew, and other distortions.
(2) ATN receive setup time
The minimum time required at the receiver between the assertion of the ATN signal and the
negation of the ACK signal to recognize the assertion of an Attention Condition.
Specified to ease receiver timing requirements.
(3) Arbitration delay
The minimum time a SCSI device shall wait from asserting the BSY signal for arbitration until the
DATA BUS is examined to see if arbitration has been won. There is no maximum time.
(4) Bus clear delay
The maximum time that for a SCSI device to release all SCSI signals after:
a) The BUS FREE phase is detected (the BSY and SEL signals are both false for a bus settle
delay);
b) The SEL signal is received from another SCSI device during the ARBITRATION phase;
c) The transition of the RST signal to true.
For item a) above, the maximum time for a SCSI device to release all SCSI bus signals is 1200 ns
from the BSY and SEL signals first becoming both false. If a SCSI device requires more than a
bus settle delay to detect BUS FREE phase, it shall release all SCSI bus signals within a bus clear
delay minus the excess time.
(5) Bus free delay
The minimum time that a SCSI device shall wait from its detection of the BUS FREE phase (BSY
and SEL both false for a bus settle delay) until its assertion of the BSY signal in preparation for
entering the ARBITRATION phase.
(6) Bus set delay
The maximum time for a SCSI device to assert the BSY signal and its SCSI ID after it detects a
BUS FREE phase for the purpose of entering the ARBITRATION phase.
(7) Bus settle delay
The minimum time to wait for the bus to settle after changing certain control signals as called out
in the protocol definitions.
Provides time for a signal transition to propagate from the driver to the terminator and back to the
driver.
44 C141-C015