HP Workstation x4000 hp workstation x4000 - Technical Reference manual - Windo - Page 60
System Resources, PCI IRQ Lines
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System BIOS and Resources System Resources System Resources System resources consist of: • "PCI IRQ Lines" on page 60 • "IRQ Routing" on page 61 • "System Memory Map" on page 65 • "I/O Port Map (I/O Addresses Used by the System)" on page 65 • "DMA Channel Controllers" on page 67 • "Interrupt Controllers" on page 63 PCI IRQ Lines PCI devices generate IRQs using up to four PCI IRQ lines (INTA#, INTB#, INTC#, and INTD#). PCI interrupts can be shared; several devices can use the same interrupt. However, optimal system performance is reached when minimizing the sharing of interrupts. Refer to "Interrupt Controllers" on page 63 for a table of the PCI device interrupts. 60 Chapter 4
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System BIOS and Resources
System Resources
Chapter 4
60
System Resources
System resources consist of:
•
“PCI IRQ Lines” on page 60
•
“IRQ Routing” on page 61
•
“System Memory Map” on page 65
•
“I/O Port Map (I/O Addresses Used by the System)” on page 65
•
“DMA Channel Controllers” on page 67
•
“Interrupt Controllers” on page 63
PCI IRQ Lines
PCI devices generate IRQs using up to four PCI IRQ lines (INTA#,
INTB#, INTC#, and INTD#).
PCI interrupts can be shared; several devices can use the same
interrupt. However, optimal system performance is reached when
minimizing the sharing of interrupts. Refer to “Interrupt Controllers” on
page 63 for a table of the PCI device interrupts.