LSI53C875 LSI Logic, LSI53C875 Datasheet - Page 175

• Manufacturer Part Number: LSI53C875
• Description: PCI to Ultra SCSI I/O Processor
• Manufacturer: LSI Logic

Register: 0x43 (0xC3)
SCSI Interrupt Status One (SIST1)
Read Only
Reading the
status of the various interrupt conditions, whether they are enabled in the
SCSI Interrupt Enable One (SIEN1)
indicates an occurrence of the corresponding condition.
Reading the
condition.
R
STO
GEN
HTH
7
x
SCSI Interrupt Status One (SIST1)
SCSI Interrupt Status One (SIST1)
x
Reserved
Selection or Reselection Time-out
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)
information on the time-out timer.
General Purpose Timer Expired
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
Timer One (STIME1)
information on the general purpose timer.
Handshake-to-Handshake Timer Expired
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
Zero (STIME0)
the handshake-to-handshake timer.
R
x
register, bits [7:4], for more information on
x
register or not. Each bit that is set
register, bits [3:0], for more
3
x
register, bits [3:0], for more
STO
register returns the
clears the interrupt
2
0
GEN
1
0
SCSI Timer
SCSI
HTH
0
0
[7:3]
5-59
2
1
0