SCSI Registers
4-25
sequence is complete. If a sequence is aborted, check
bit 4 in the SCNTL1 register to verify that the
LSI53C1000 is not connected to the SCSI bus.
WATN
Select with SATN/ on a Start Sequence
4
When this bit is set and the LSI53C1000 is in the initiator
mode, the SATN/ signal is asserted during selection of a
SCSI target device. This is to inform the target that the
LSI53C1000 has a message to send. If a selection
time-out occurs while attempting to select a target device,
SATN/ is deasserted at the same time SSEL/ is
deasserted. When this bit is cleared, the SATN/ signal is
not asserted during selection. When executing SCSI
SCRIPTS, this bit is controlled by the SCRIPTS
processor, but manual setting is possible in the low level
mode.
EPC
Enable Parity/CRC/AIP Checking
3
When this bit is set and the SCSI transfers are
asynchronous or ST synchronous, the SCSI data bus is
checked for odd parity when data is received from the
SCSI bus in either the initiator or the target mode. If a
parity error is detected, bit 0 of the
register is set and an interrupt may be
generated.
When SCSI transfers are DT synchronous, the CRC is
checked when the target requests a CRC transfer using
the DP0 signal on the SCSI bus. If a CRC error is
detected, bit 0 of the
SCSI Interrupt Status Zero (SIST0)
register is set and an interrupt may be generated.
If the LSI53C1000 SCSI function is operating in the
initiator mode and a parity error or CRC error is detected,
SATN/ can optionally be asserted, but the transfer
continues until the target changes phase or the block
move in which the parity error was detected completes.
When this bit is clear, parity errors are not reported. CRC
errors are reported in bit 0 of the
. To disable CRC checking and reporting,
set bit 7, Disable CRC Checking, of
Содержание LSI53C1000
Страница 6: ...vi Preface...
Страница 16: ...xvi Contents...
Страница 28: ...1 12 Introduction...
Страница 234: ...4 124 Registers...
Страница 314: ...6 40 Specifications This page intentionally left blank...
Страница 318: ...6 44 Specifications This page intentionally left blank...
Страница 344: ...6 70 Specifications This page intentionally left blank...
Страница 350: ...6 76 Specifications Figure 6 42 LSI53C1000 329 Ball Grid Array Bottom view...
Страница 352: ...6 78 Specifications...
Страница 360: ...A 8 Register Summary...
Страница 376: ...IX 12 Index...