Avago Technologies LSI53C1010R User Manual

Page 167

SCSI Registers

4-49

Version 2.2

Setting this bit does not assert the SCSI RST/ signal.
This reset does not 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

SIGP is a R/W bit that is writable at any time. It is polled
and reset using

Chip Test Two (CTEST2)

. 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

The SCRIPTS processor may set this bit using a
SCRIPTS register write instruction. An external processor
may also set it while the LSI53C1010R SCSI function is
executing a SCRIPTS operation. This bit enables the
SCSI function to notify an external processor of a
predefined condition while SCRIPTS are running. The
external processor may also notify the LSI53C1010R
SCSI function of a predefined condition, and the SCRIPTS
processor may take action while SCRIPTS are executing.

CON

Connected

This bit is automatically set any time the LSI53C1010R
SCSI function is connected to the SCSI bus as an initiator
or as a target. It is set after successfully completing
selection or when the LSI53C1010R SCSI function
responds to a bus-initiated selection or reselection. It is
also set after the SCSI function wins arbitration when
operating in the low level mode. When this bit is cleared,
the LSI53C1010R SCSI function is not connected to the
SCSI bus.