Avago Technologies LSI53C896 - Manual (Page 164)

4-52 Registers
Version 3.3 Copyright © 1998–2003 by LSI Logic Corporation. All rights reserved.
external processor may also notify the LSI53C896 SCSI
function 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 LSI53C896 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 LSI53C896 SCSI function responds
to a bus-initiated selection or reselection. It is also set
after the SCSI function wins arbitration when operating in
low level mode. When this bit is cleared, the LSI53C896
SCSI function is not connected to the SCSI bus.
INTF Interrupt-on-the-Fly 2
This bit is asserted by an INTFLY instruction during
SCRIPTS execution. SCRIPTS programs do not halt when
the interrupt occurs. This bit can notify a service routine,
running on the main processor while the SCRIPTS
processor is still executing a SCRIPTS program. If this bit
is set, when the
Interrupt Status Zero (ISTAT0) register is
read it is not automatically cleared. To clear this bit, write
it to a one. The reset operation is self-clearing.
Note: If the INTF bit is set but SIP or DIP is not set, do not
attempt to read the other chip status registers. An
Interrupt-on-the-Fly must be cleared before servicing any
other interrupts indicated by SIP or DIP.
This bit must be written to one in order to clear it after it
has been set.
SIP SCSI Interrupt Pending 1
This status bit is set when an interrupt condition is
detected in the SCSI portion of the LSI53C896 SCSI
function. The following conditions cause a SCSI interrupt
to occur:
•
A phase mismatch (initiator mode) or SATN/ becomes
active (target mode)
•
An arbitration sequence completes
•
A selection or reselection time-out occurs
•
The LSI53C896 SCSI function is selected
•
The LSI53C896 SCSI function is reselected