60
or ha ng if Initia te Sync Negotia tion is ena bled . Set Initia te Sync
Negotia tion to
no
for these devices.
◼
Maximum Sync Transfer Rate
This option determines the ma ximum synchronous da ta tra nsfer ra te tha t
the host a da pter ca n support. The host a da pter supports ra tes up to the Fa st
SCSI ma ximum of 10.0 MBytes / sec. The defa ult va lue is 10.0. The
P54TSW ha s a 16- bit (2-byte) cha nnel tha t provides a n effective
ma ximum synchronous tra nsfer ra te of 20.0 MBytes /sec. (10.0 MBytes
per 8-bit cha nnel ). Va lid settings a re
SCSI Select
Transfer
Rate
P54TS
SCSI-2 Devices
Effective Transfer rate
P
Wide Ultra SCSI-2 Devices
Effective Transfer Rate
10.0
10.0 MBytes/sec.
40 MBytes/sec.
8.0
8.0 MBytes/sec.
32 MBytes/sec.
6.7
6.7 MBytes/sec.
26.8 MBytes/sec.
5.0
5.0 MBytes/sec.
20 MBytes/sec.
In most ca ses , you ca n use the ma ximum va lue of 10.0. If the host
a da pter is set not to negotia te for synchronous da ta tra nsfer (i.e., Initia te
Sync Negotia tion is set to
no
), then the va lue selected here is the
ma ximum ra te tha t the host a da pter a ccepts from the device during
negotia tion. ( This is sta nda rd SCSI protocol.)
Note :
Some older SCSI-1 devices do not support Fa st SCSI da ta tra nsfer
ra te (10.0,8.0 , a nd 6.7 ). This ma y ca use your computer to opera te
erra tica lly or ha ng if the tra nsfer ra te is set too high . Select a Ma ximum
Sync Tra nsfer Ra te of 5.0 for these devices.
◼
Enable Disconnection
This option determines whether the host a da pter a llows a SCSI device to
disconnect from the SCSI bus ( sometimes ca lled Disconnect / Reconnect).
Disconnect / Reconnect a llows the host a da pter to perform other
opera tions on the SCSI bus while the SCSI device is tempora rily
disconnected.
When set to
yes
, the SCSI device ma y disconnect from the SCSI bus . The
SCSI device , however ,ma y choose not to disconnect , even if permitted
by the host a da pter ( this ca n usua lly be configured on the SCSI device).
When set to
no
, the SCSI device is not a llowed to disconnect from the
SCSI bus . The defa ult setting is
yes
.
You should lea ve Ena ble Disconnection set to
yes
if two or more SCSI
devices a re connected to the on boa rd SCSI port . This optimizes SCSI
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