Adaptec AMM-1572 - Manual (Page 38)

2-14
AMM-1570/1572 User’s Guide
AMM-1570/1572 User’s Guide
Stock Number: 510526-00, Rev. B
Page: 2-14
Print Spec Number: 492379-00
Current Date: 3/7/94
ECN Date: 3/8/94
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SCSI Disconnection
Pin pair DN allows you to enable or disable SCSI Disconnection. The
default setting is enabled. The available settings are
SCSI Disconnection (sometimes referred to as Disconnect/Recon-
nect) determines whether the host adapter allows a SCSI device to
disconnect from the SCSI bus while the device completes a lengthy
operation. If disconnection is allowed, the host adapter can perform
other operations on the SCSI bus while the devices are temporarily
disconnected.
Note: A SCSI device may choose not to disconnect, even
if allowed to by the host adapter (this is usually config-
urable on the SCSI device).
In general, disconnect should be allowed for the most efficient SCSI
bus utilization and highest overall system performance. If only one
SCSI device is attached to the SCSI host adapter, disconnects are not
required for efficient SCSI bus utilization since only one SCSI device
is using the SCSI bus. A slight performance increase may be realized
if disconnect is not allowed in this case, due to the decreased SCSI
overhead. In multidevice environments, disconnect should normally
be allowed to take advantage of the Disconnect/Reconnect feature.
Floptical Drive Support
Pin pair FL allows you to enable or disable Floptical Drive Support.
Enable this option if you are connecting a Floptical drive to the SCSI
bus. The available settings are
DN
= SCSI Disconnection Enabled *
DN
= SCSI Disconnection Disabled
* = Default
= Floptical Support Enabled = Floptical Support Disabled *
* = Default
FL FL