SCSI Registers
4-47
clear the ID Mode bit or any of the PCI configuration
registers. This bit is not self-clearing; it must be cleared
to clear the reset condition. A hardware reset also clears
this bit.
Note:
If SCRIPTS are running, then the ABRT bit (bit 7) must be
set prior to setting the SRST bit.
SIGP
Signal Process
5
SIGP is a R/W bit that is writable at any time. It is polled
and reset using
. The SIGP bit
is used in various ways to pass a flag to or from a running
SCRIPTS instruction.
The only SCRIPTS instruction directly affected by the
SIGP bit is Wait For Selection/Reselection. Setting the
SIGP bit causes this instruction to jump to the alternate
address immediately. The instructions at the alternate
jump address should check the status of SIGP to
determine the cause of the jump. The SIGP bit is usable
at any time and is not restricted to the wait for
selection/reselection condition.
SEM
Semaphore
4
The SCRIPTS processor may set this bit using a
SCRIPTS register write instruction. An external processor
may also set it while the LSI53C1000 is executing a
SCRIPTS operation. This bit enables the LSI53C1000 to
notify an external processor of a predefined condition
while SCRIPTS are running. The external processor may
also notify the LSI53C1000 of a predefined condition and
the SCRIPTS processor may take action while SCRIPTS
are executing.
CON
Connected
3
This bit is automatically set any time the LSI53C1000 is
connected to the SCSI bus as an initiator or as a target.
It is set after successfully completing selection or when
the LSI53C1000 responds to a bus-initiated selection or
reselection. It is also set after the chip wins arbitration
when operating in the low level mode. When this bit is
cleared, the LSI53C1000 is not connected to the SCSI
bus.
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...