Avago Technologies LSI53C825AE - Manual (Page 132)

4-44 Registers
AIP Arbitration in Progress 4
Arbitration in Progress (AIP = 1) indicates that the
LSI53C825A has detected a Bus Free condition, asserted
BSY, and asserted its SCSI ID onto the SCSI bus.
LOA Lost Arbitration 3
When set, LOA indicates that the LSI53C825A has
detected a bus free condition, arbitrated for the SCSI bus,
and lost arbitration due to another SCSI device asserting
the SEL/ signal.
WOA Won Arbitration 2
When set, WOA indicates that the LSI53C825A has
detected a Bus Free condition, arbitrated for the SCSI
bus and won arbitration. The arbitration mode selected in
the
SCSI Control Zero (SCNTL0) register must be full
arbitration and selection to set this bit.
RST/ SCSI RST/ Signal 1
This bit reports the current status of the SCSI RST/
signal, and the RST signal (bit 6) in the
Interrupt Status
(ISTAT) register. This bit is not latched and may change
as it is read.
SDP0/ SCSI SDP0/ Parity Signal 0
This bit represents the present state of the SCSI SDP0/
parity signal. This signal is not latched and may change
as it is read.
Register: 0x0E (0x8E)
SCSI Status One (SSTAT1)
Read Only
FF[3:0] FIFO Flags [7:4]
These four bits, along with SCSI Status Two (SSTAT2) ,
bit 4, define the number of bytes or words that currently
reside in the LSI53C825A SCSI synchronous data FIFO.
These bits are not latched and they will change as data
moves through the FIFO.
7 4 3 2 1 0
FF[3:0] SDPOL MSG C/D I/O
0 0 0 0 x x x x