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SCSI Registers 4-47
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
significantbyteintheSCSI 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).Itallowstheuserto
detect the case in which a target device disconnects, and
then some SCSI device selects or reselects the
LSI53C875A. 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 SCNTL1 is off. This bit
is cleared when a Block Move instruction is executed
while the Connected bit in 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.
Registers:0x10–0x13
Data Structure Address (DSA)
Read/Write
DSA Data Structure Address [31:0]
This 32-bit register contains the base address used for all
table indirect calculations. The DSA register is usually
loaded prior to starting an I/O, but it is possible for a
SCRIPTS Memory Move to load the DSA during the I/O.
During any Memory-to-Memory Move operation, the
contents of this register are preserved. The power-up
value of this register is indeterminate.
31 0
DSA
00000000000000000000000000000000