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Operating Registers
5-6
SYM53C810A Data Manual
Bit 4
WAT N (Select with SAT N/ on a start
sequence)
When this bit is set and the SYM53C810A is
in initiator mode, the SAT N/ signal will be
asserted during SYM53C810A selection of a
SCSI target device. T his is to inform the target
that the SYM53C810A has a message to send.
If a selection time-out occurs while attempting
to select a target device, SAT N/ will be deas-
serted at the same time SSEL/ is deasserted.
When this bit is clear, the SAT N/ signal will
not be asserted during selection. When execut-
ing SCSI SCRIPT S, this bit is controlled by
the SCRIPT S processor, but it may be set
manually in low level mode.
Bit 3
E PC (E nable parity checking)
When this bit is set, the SCSI data bus is
checked for odd parity when data is received
from the SCSI bus in either initiator or target
mode. If a parity error is detected, bit 0 of the
SIST 0 register is set and an interrupt may be
generated.
If the SYM53C810A is operating in initiator
mode and a parity error is detected, SAT N/
can optionally be asserted, but the transfer
continues until the target changes phase. When
this bit is cleared, parity errors are not
reported.
Bit 2
Reserved
Bit 1
AAP (Assert SAT N/ on parity error)
When this bit is set, the SYM53C810A auto-
matically asserts the SAT N/ signal upon detec-
tion of a parity error. SAT N/ is only asserted in
initiator mode. T he SAT N/ signal is asserted
before deasserting SACK / during the byte
transfer with the parity error. T he Enable Par-
ity Checking bit must also be set for the
SYM53C810A to assert SAT N/ in this man-
ner. A parity error is detected on data received
from the SCSI bus.
If the Assert SAT N/ on Parity Error bit is
cleared or the Enable Parity Checking bit is
cleared, SAT N/ will not be automatically
asserted on the SCSI bus when a parity error is
received.
Bit 0
T RG (Target role)
T his bit determines the default operating role
of the SYM53C810A. T he user must manually
set target or initiator role. T his can be done
using the SCRIPT S language (SET TARGET
or CLEAR TARGET ). When this bit is set, the
chip is a target device by default. When this bit
is cleared, the SYM53C810A is an initiator
device by default.
CAUT ION:
Writing this bit while not connected may cause the
loss of a selection or reselection due to the chang-
ing of target or initiator roles.