Revision 5.01 – November 30, 2005
S5335 – PCI Bus Controller, 3.3V
Data Sheet
Interrupt Line Register (INTLN)
This register indicates the interrupt routing for the
S5335 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 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
4
3
2
1
0
Bit
FFh
Value
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DS1657 51
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