LSI 53C810A User Manual
Page 81
5-7
When this bit is set, the LSI53C810A does not halt the
SCSI transfer when SATN/ or a parity error is received.
CON
Connected
4
This bit is automatically set any time the LSI53C810A is
connected to the SCSI bus as an initiator or as a target.
It is set after the LSI53C810A successfully completes
arbitration or when it has responded to a bus-initiated
selection or reselection. This bit is also set after the chip
wins simple arbitration when operating in low level mode.
When this bit is cleared, the LSI53C810A is not
connected to the SCSI bus.
The CPU can force a connected or disconnected
condition by setting or clearing this bit. This feature is
used primarily during loopback mode.
RST
Assert SCSI RST/ Signal
3
Setting this bit asserts the SRST/ signal. The SRST/
output remains asserted until this bit is cleared. The
25
µ
s minimum assertion time defined in the SCSI
specification must be timed out by the controlling
microprocessor or a SCRIPTS loop.
AESP
Assert Even SCSI Parity (force bad parity)
2
When this bit is set, the LSI53C810A asserts even parity.
It forces a SCSI parity error on each byte sent to the
SCSI bus from the LSI53C810A. If parity checking is
enabled, then the LSI53C810A checks data received for
odd parity. This bit is used for diagnostic testing and is
cleared for normal operation. It is useful to generate
parity errors to test error handling functions.
IARB
Immediate Arbitration
1
Setting this bit causes the SCSI core to immediately
begin arbitration once a Bus Free phase is detected
following an expected SCSI disconnect. This bit is useful
for multithreaded applications. The ARB[1:0] bits in
register are set for full arbitration
and selection before setting this bit.
Arbitration is retried until won. At that point, the
LSI53C810A holds BSY and SEL asserted, and waits for
a select or reselect sequence. The Immediate Arbitration