LSI 53C875A - Manual (Page 167)

SCSI Registers 4-75
RST SCSI Reset Condition 1
Indicates assertion of the SRST/ signal by the
LSI53C875A or any other SCSI device. This condition is
edge-triggered, so multiple interrupts cannot occur
because of a single SRST/ pulse.
PAR SCSI Parity Error 0
Indicates detection by the LSI53C875A of a parity error
while receiving or sending SCSI data. See the Disable
Halt on Parity Error or SATN/ Condition bits in the
SCSI
Control One (SCNTL1) register for more information on
when this condition is actually raised.
Register: 0x41
SCSI Interrupt Enable One (SIEN1)
Read/Write
This register contains the interrupt mask bits corresponding to the
interrupting conditions described in the
SCSI Interrupt Status One
(SIST1) register. An interrupt is masked by clearing the appropriate mask
bit. For more information on interrupts, refer to Chapter 2, “Functional
Description.”
R Reserved [7:3]
STO Selection or Reselection Time-out 2
The SCSI device which the LSI53C875A 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
The general purpose timer is expired. 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.
7 3 2 1 0
R STO GEN HTH
x x x x x 0 0 0