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National Instruments Corporation
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VXIpc 700 Series User Manual
B
VXIpc 700 Series
System Resources
This appendix describes what system resources are available on the
VXIpc 700 Series and where they are allocated. Because PCI is a relatively
new addition to PCs, this appendix describes how PCI interrupts fit into a
PC architecture before listing the devices that use them.
PCI Interrupts
PCI interrupts can be shared by multiple devices and are therefore more
flexible than ISA interrupts. They do not actually connect to the processor
directly; they are instead mapped through ISA interrupts in the system I/O
module. The interrupt handler for a particular ISA interrupt must know if it
will be acknowledging a PCI device.
Resource Tables
The tables in this section describe where system resources are assigned.
Table B-1 lists how the ISA interrupts are allocated on the VXIpc 700
Series and whether they are driven by a PCI interrupt. Table B-2 lists DMA
channel allocation, and Table B-3 gives the I/O address map.
Table B-1.
VXIpc 700 Series ISA Interrupt Resource Allocations
ISA Interrupt
PCI Interrupt
Device
NMI
None
Parity
0
None
Timer
1
None
Keyboard
2
None
IRQ Expansion (8-15)
3
None
PCMCIA Slot
4
None
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