9.8.7
Interrupt Configuration Register
This register is at I/O address 21Dh.
NOTE
This register is not present in early versions of the board. Software can toggle bit
0 and read it back to test if this register is present. On early versions of the board
this register will read as all 1’s.
7
6
5
4
3
2
1
0
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RFU
RFU
PMC
PMC
M66EN
M66EN
ENUM#
ENUM#
INTERRUPT INTERRUPT INTERRUPT INTERRUPT STATUS
ROUTING
MODE1
MODE0
FLAG
ENABLE
Bit 0: CompactPCI ENUM# Interrupt Routing (Read/Write)
This bit selects which interrupt the CompactPCI ENUM# signal is routed to. This interrupt is only
relevant when the board is System Controller.
0 = NMI
1 = PCI bus interrupt
NOTE
Bit 5 of Status and Control Register 0 enables this interrupt.
Bit 1: CompactPCI ENUM# Pin Status (Read Only)
0 = ENUM# is not asserted
1 = ENUM# is asserted
Bit 2: CompactPCI M66EN High-Low Transition Interrupt Enable (Read/Write)
When the board is System Controller it monitors the CompactPCI M66EN signal for high to low
transitions during normal operation. A PCI bus interrupt may be generated if such a transition
occurs. This bit enables that interrupt. The setting of bit 0 has no effect on this interrupt.
0 = transition interrupt is disabled
1 = transition interrupt is enabled
Bit 3: CompactPCI M66EN High-Low Transition Flag (Read Only)
This bit reports whether or not there has been a high to low transition on the CompactPCI
M66EN signal.
0 = a high to low transition has not occurred
1 = a high to low transition has occurred
Bit 3: CompactPCI M66EN High-Low Transition Flag (Write Only)
This flag can be cleared by writing to the register with a zero in this bit position
0 = clear flag
1 = leave flag as is
Bit 4: PMC Interrupt Mode 0 (Read/Write)
Bit 5: PMC Interrupt Mode 1 (Read/Write)
The PMC Interrupt Mode bits support a customer application in which the Ethernet interrupts are
routed to the PMC sites and are handled by one or two processor PMC modules. The settings
are:
9-18
PP 110/01x
Additional Local I/O Functions
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