s5920 Applied Micro Circuits Corporation (AMCC), s5920 Datasheet - Page 67
s5920
Manufacturer Part Number
s5920
Description
Pci Product
Manufacturer
Applied Micro Circuits Corporation (AMCC)
Datasheet
1.S5920.pdf
(165 pages)
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S5920 – PCI Product: PCI Configuration Registers
INTERRUPT LINE REGISTER (INTLN)
Figure 22. Interrupt Line Register
AMCC Confidential and Proprietary
Register Name:
Address Offset:
Power-up value:
Boot-load:
Attribute:
Size:
7
Interrupt Line
3Ch
FFh
External nvRAM offset 7Ch
Read/Write
8 bits
FFh
This register indicates the interrupt routing for the
S5920 controller. The ultimate value for this register is
system-architecture specific. For x86 based PCs, the
values in this register correspond with the established
interrupt numbers associated with the dual 8259 con-
trollers used in those machines. In x86-based PC
systems, the values of 0 to 15 correspond with the IRQ
numbers 0 through 15, and the values from 16 to 254
are reserved. The value of 255 (the controller’s default
power-up value) signifies either “unknown” or “no con-
nection” for the system interrupt. This register is boot-
loaded from the external boot memory or may be writ-
ten by the PCI interface.
Revision 1.02 – April 12, 2007
Data Book
DS1596
0
67
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