Allen-Bradley 1747-OC Series, User Manual

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1747-UM001A-US-P - March 2000
5-6 Defining System Settings
Figure 5.1
Triggering ISA/EISA and PCI/PnP interrupts
•
If you set a 1747-OCKTX, -OCKTXD jumper for INTA, the channel
uses the PCI interrupt assigned to the module.
Table 5.C
Assigning PCI and ISA interrupts for an OCKTX module
OCKTX
OCKTXD
module
IRQ2
IRQ3
IRQ5
IRQ7
IRQ9
INTA
ISA bus
PCI bus BIOS switch
IRQ
controller
open controller
CPU
PCI
bridge
EISA or PCI - Low True
Edge Level - High True
If you have a: Then:
1747-OCE
•
Make sure there is at least one PCI/PnP interrupt, besides IRQ 14 or IRQ 15,
defined in BIOS.
•
IRQ 14 and IRQ 15 cannot be assigned to an open controller option module.
1747-OCF
•
IRQ 14 is the only IRQ that cannot be assigned to an open controller option
module.
•
If you are not using an ATA drive in a PCMCIA or IDE interface module, IRQ
15 can be set as a PCI interrupt and assigned to an open controller option
module.
If you set the jumpers so that: Results:
both channels have a unique ISA interrupt
•
Each channel has a unique ISA interrupt.
•
Make sure the IRQs selected by the jumpers are defined as ISA/EISA in
BIOS
•
BIOS also assigns the module a PCI interrupt - the module does not use
this interrupt but it is reported by the
ocpci
utility.
one channel has an ISA interrupt
other channel has INTA selected
•
Each channel has a unique interrupt (one ISA, one PCI).
•
Make sure the ISA IRQ selected by the jumper is defined as ISA/EISA in
BIOS.
•
Make sure there is at least one PCI/PnP interrupt defined, besides IRQ 14
or IRQ 15 if you are using a 1747-OCE. If you are using a 1747-OCF, IRQ
15 is a valid PCI interrupt.
•
Use the
ocpci
utility to determine which PCI interrupt was assigned to
the channel set for INTA.
both channels have INTA selected
•
BIOS assigns the same PCI interrupt to both channels.
•
Make sure there is at least one PCI/PnP interrupt defined, besides IRQ 14
or IRQ 15 if you are using a 1747-OCE. If you are using a 1747-OCF, IRQ
15 is a valid PCI interrupt.
•
Both channels can share the same PCI interrupt as long as your
application supports shared interrupts.
•
Use the
ocpci
utility to determine which PCI interrupt was assigned to
the channels.