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5-54 Operating Registers
R Reserved [7:3]
STO Selection or Reselection Time-out 2
When the SCSI device which the LSI53C810A is
attempting to select or reselect does not respond within
the programmed time-out period. See the description of
the SCSI Timer Zero (STIME0) register, bits [3:0], for
more information on the time-out timer.
GEN General Purpose Timer Expired 1
This bit is set when the general purpose timer expires.
The time measured is the time between enabling and
disabling of the timer. See the description of the SCSI
Timer One (STIME1) register, bits [3:0], for more
information on the general purpose timer.
HTH Handshake-to-Handshake Timer Expired 0
This bit is set when the handshake-to-handshake timer
expires. The time measured is the SCSI Request to
Request (target) or Acknowledge-to-Acknowledge
(initiator) period. See the description of the SCSI Timer
Zero (STIME0) register, bits [7:4], for more information on
the handshake-to-handshake timer.
Register: 0x44 (0xC4)
SCSI Longitudinal Parity (SLPAR)
Read/Write
SLPAR SCSI Longitudinal Parity [7:0]
This register performs a bytewise longitudinal parity
check on all SCSI data received or sent through the SCSI
core. If one of the bytes received or sent (usually the last)
is the set of correct even parity bits, SCSI Longitudinal
Parity (SLPAR) should go to zero (assuming it started at
zero). As an example, suppose that the following three
data bytes and one check byte are received from the
SCSI bus (all signals are shown active HIGH):
7 0
SLPAR
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