Avago Technologies LSI8751D - Manual (Page 146)

5-30 SCSI Operating Registers
FF4 FIFO Flags bit 4 4
This is the most significant bit in the SCSI FIFO Flags
field, with the rest of the bits in
SCSI Status One
(SSTAT1) . For a complete description of this field, see the
definition for SCSI Status One (SSTAT1) , bits [7:4].
SPL1 Latched SCSI parity for SD[15:8] 3
This active high bit reflects the SCSI odd parity signal
corresponding to the data latched into the most
significant byte in the
SCSI Input Data Latch (SIDL)
register.
R Reserved 2
LDSC Last Disconnect 1
This bit is used in conjunction with the Connected (CON)
bit in
SCSI Control One (SCNTL1) . It allows the user to
detect the case in which a target device disconnects, and
then some SCSI device selects or reselects the
LSI53C875. If the Connected bit is asserted and the
LDSC bit is asserted, a disconnect is indicated. This bit
is set when the Connected bit in
SCSI Control One
(SCNTL1) is off. This bit is cleared when a Block Move
instruction is executed while the Connected bit in SCSI
Control One (SCNTL1) is on.
SDP1 SCSI SDP1 Signal 0
This bit represents the active high current state of the
SCSI SDP1 parity signal. It is unlatched and may change
as it is read.