Revision 1.02 – June 27, 2006
S5935 – PCI Product
Data Book
This register indicates the interrupt routing for the
S5935 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, if present, and
may be written by the PCI interface.
INTERRUPT LINE REGISTER (INTLN)
Interrupt Line
Register Name
Address Offset
Power-up value
Boot-load
3Ch
FFh
External nvRAM offset 7Ch
Read/Write
8 bit
Attribute
Size
Figure 20. Interrupt Line Register
7
6
5
42
3
1
0
Bit
FFh
Value
AMCC Confidential and Proprietary
DS1527
55
AMCC [ APPLIED MICRO CIRCUITS CORPORATION ]
