Avago Technologies LSI53C825AE - Manual (Page 165)

Operating Registers 4-77
register) must be set for this bit to become active. The
LSI53C825A always generates parity when sending SCSI
data.
Register: 0x43 (0xC3)
SCSI Interrupt Status One (SIST1)
Read Only
Reading the SCSI Interrupt Status One (SIST1) register returns the
status of the various interrupt conditions, whether they are enabled in the
SCSI Interrupt Enable One (SIEN1) register or not. Each bit that is set
indicates an occurrence of the corresponding condition.
Reading the SIST1 clears the interrupt condition.
R Reserved [7:3]
STO Selection or Reselection Time-Out 2
The SCSI device which the LSI53C825A 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.
7 3 2 1 0
R STO GEN HTH
x x x x x 0 0 0