Bus Free Phase; Figure 1.25 Bus Free Phase - Fujitsu MAW3073 SERIES Specifications

1.6.1

BUS FREE phase

All SCSI devices do not use the bus in the BUS FREE phase. SCSI devices shall detect the BUS
FREE phase after SEL and BSY signals are both false for one Bus Settle Delay.
SCSI devices which have detected the BUS FREE phase shall release all bus signals within one
Bus Clear Delay after BSY and SEL signals become false for Bus Settle Delay. If a SCSI device
requires more than Bus Settle Delay to detect the BUS FREE phase, it shall release all bus signals
within the following period (t):
t = Bus Clear Delay - Period required for BUS FREE phase detection + Bus Settle Delay
The maximum time allowed for releasing the bus after both SEL and BSY becomes false is Bus
Settle Delay + Bus Clear Delay.
Figure 1.25 shows the BUS FREE phase.
1-48

Figure 1.25 BUS FREE phase

C141-C011