Address/Configuration Option Descriptions - HP C2488A Technical Reference Manual

Table 2·2. Address/Configuration Option Descriptions
Configuration Option Description
Auto Spin Up When shorted, the disk drive will automatically spin up at power on. H open, the drive
will not spin up until the Initiator sends a Start Unit command. When not in the auto
spin up mode the drive will return "Not Ready" to all commands except REQUEST
SENSE, INQUIRY, RESERVE, RELEASE, and START UNIT until the drive is ready for
access.
Parity When shorted, the disk drive checks parity on commands and data. When open, the disk
drive does not check for parity. Parity bits are generated whether this pin-set is open or
shorted.
SCSI-l/SCSI-2 When open, the drive checks Mode Page 09, byte 8, bit 4 and responds accordingly. The
default is SCSI-2. When shorted the drive is forced to respond as a SCSI-! device.
SCSI Address Selection
Narrow SCSI drives are shipped from the factory with shorting jumpers across all three
pin-sets which sets up a SCSI Address of 7. Wide SCSI drives are shipped from the
factory with shorting jumpers across all four pin-sets which sets up a SCSI Address of 15.
Synchronized Spindle. These pinsets control the routing of the Synchronized Spindle signals. They have no effect
if the Synchronous Spindle Mode is disabled. The C2486A/88A/90A disk drives support
the Stand Alone, Slave, and Master modes, but not the Master Control mode. The
power-on default for all drives is the Stand Alone Mode. Refer to the Mode Sense/Mode
Select command page 04 infomation in Appendix A for more details about implementing
these functions, including positional offset from the input sync signal.
• When the drive is in the
Stand Alone
mode:
It does not transmit a sync signal.
It does not sync to allY externally sourced slave sync inputs.
• When the drive is set to the SIa1le mode:
It does not transmit a sync signal.
It will sync to an externally sourced slave sync signal.
• When the drive is set to the
Ma8ter
mode:
It transmits a sync signal on the sync pin.
It syncs internally to the same signal.
Synchronous Data Transfer When shorted, the drive will initiate an SDTR message at power-on and RESET. When
Request (SDTR)
open, the drive will not initiate an SPTR message. The drive willl'espond to a
host-initiated SDTR message whether this pin-set is open or shorted.
Termination Power Source
Determines the power source and routing for the on-board terminators.
Unit Attention
Controls the Unit Attention function: Shorted
=
disabled; Open
=
enabled.
Write Protect
When shorted, the entire drive is forced into the media Write Protect mode. When open,
the Write Protect function can be controlled with the Mode Select command. The default
is NOT write protected. Refer to the Mode Select/Mode Sense explanation in Appendix
A for more details.
DRAFT Product Installation 2·7
1/18/93 09:58