LSI 53C810A - Manual (Page 127)

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when the LSI53C810A operates in the initiator mode.
When the LSI53C810A operates in low level mode, any
disconnect causes an interrupt, even a valid SCSI
disconnect. This bit is also set if a selection time-out
occurs (it may occur before, at the same time, or stacked
after the STO interrupt, since this is not considered an
expected disconnect).
RST SCSI RST/ Received 1
This bit is set when the LSI53C810A detects an active
SRST/ signal, whether the reset was generated external
to the chip or caused by the Assert SRST/ bit in the
SCSI
Control One (SCNTL1) register. This SCSI reset
detection logic is edge-sensitive, so that multiple
interrupts are not generated for a single assertion of the
SRST/ signal.
PAR Parity Error 0
This bit is set when the LSI53C810A detects a parity
error while receiving SCSI data. The Enable Parity
Checking bit (bit 3 in the
SCSI Control Zero (SCNTL0)
register) must be set for this bit to become active. The
LSI53C810A 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 SCSI Interrupt Status One (SIST1) register clears the
interrupt condition.
7 3 2 1 0
R STO GEN HTH
x x x x x 0 0 0