450NX Datasheet, PDF (46/248 Pages) Intel Corporation – Intel 450NX PCIset

3. Register Descriptions
7
reserved (0)
6
System Bus Time-out Flag.
This flag is set when the watchdog timer monitoring accesses on the system bus times
out. See the BINIT#-on-System-Bus-Time-outs Enable and the BINIT# Driver Enable in the
ERRCMD register.
5
Expander Bus 1 Parity Error Flag.
This flag is set when Expander Bus #1 reports a parity error on data inbound from the
PXB. This condition is a catastrophic fail and will also assert BINIT#.
4
Expander Bus 0 Parity Error Flag.
This flag is set when Expander Bus #0 reports a parity error on data inbound from the
PXB. This condition is a catastrophic fail and will also assert BINIT#.
3
BERR# Error Flag.
This flag is set when BERR# is detected asserted on the system bus.
2
Address Parity Error.
This flag is set upon detecting the assertion of AP#, indicating a parity error on the
system address signals. If the AERR# Driver Enable is set in the ERRCMD register,
AERR# is asserted. If the BINIT# Driver Enable is set in the ERRCMD register, BINIT#
is asserted.
1
Response Parity Error Flag.
This flag is set upon detecting the assertion of RP#, indicating a parity error on the
system bus response signals. If the BINIT# Driver Enable is set in the ERRCMD
register, BINIT# is also asserted.
0
Request Parity Error.
This flag is set upon detecting the assertion of RP#, indicating an error on ADS or
request signals. If the AERR# Driver Enable is set in the ERRCMD register, AERR# is
asserted. If the BINIT# Driver Enable is set in the ERRCMD register, BINIT# is asserted.
3.3.15 GAPEN: Gap Enables
Address Offset: 60h
Default Value: 0Eh
Bits Description
Size:
8 bits
Attribute: Read/Write
7
reserved (0)
6
ISA Space Enable.
When set, the ISA Space address range is enabled. Memory-mapped accesses that fall
within this address range are forwarded to the compatibility PCI bus. If this bit is
cleared, accesses to this address range are handled normally. Default=0.
5
High Expansion Gap Enable.
When set, the High Expansion Gap (HXG) is enabled. Default=0.
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Intel® 450NX PCIset