Avago Technologies LSI8751D - Manual (Page 143)

5-27
AIP Arbitration in Progress 4
Arbitration in Progress (AIP = 1) indicates that the
LSI53C875 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 LSI53C875 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 LSI53C875 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 active high current status 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 LSI53C875’s SCSI synchronous data FIFO
and shown in
Table 5.5 . These bits are not latched and
they will change as data moves through the FIFO.
7 4 3 2 1 0
FF[3:0] SDP0L MSG C/D I/O
0 0 0 0 x x x x