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National Instruments Corporation
B-1
PXI-8150 Series User Manual
Appendix
B
PXI-8150 Series
System Resources
This appendix describes the system resources available on the
PXI-8150 Series embedded computer 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 are more flexible than ISA interrupts because multiple
devices can share these interrupts. PCI interrupts do not actually
connect to the processor directly; they map 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 following tables describe where system resources are assigned.
Table B-1 lists how the ISA interrupts are allocated on the PXI-8150
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. PXI-8150 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
COM2
4
None
COM1
5
PCI
Plug and Play PXI Modules