Avago Technologies LSI8751D - Manual (Page 175)

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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 SCSI Interrupt Status One (SIST1) clears the interrupt
condition.
R Reserved [7:3]
STO Selection or Reselection Time-out 2
The SCSI device which the LSI53C875 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