82801BA Datasheet, PDF (124/498 Pages) Intel Corporation – Intel 82801BA I/O Controller Hub 2 (ICH2) and Intel 82801BAM I/O Controller Hub 2 Mobile

Functional Description
5.9.5 Data Frame Format
Table 5-29 shows the format of the data frames. For the PCI interrupts (A-D), the output from the
ICH2 is ANDed with the PCI input signal. Thus, the interrupt can be signaled via both the PCI
interrupt input signal and via the SERIRQ signal (they are shared).
Table 5-29. Data Frame Format
Data
Frame #
Interrupt
Clocks Past
Start Frame
Comment
1
IRQ0
2
IRQ1
3
SMI#
4
IRQ3
5
IRQ4
6
IRQ5
7
IRQ6
8
IRQ7
9
IRQ8
10
IRQ9
11
IRQ10
12
IRQ11
13
IRQ12
14
IRQ13
15
IRQ14
16
IRQ15
17
IOCHCK#
18
PCI INTA#
19
PCI INTB#
20
PCI INTC#
21
PCI INTD#
2
Ignored. IRQ0 can only be generated via the internal 8524
5
8
Causes SMI# if low. Sets the SERIRQ_SMI_STS bit.
11
14
17
20
23
26
Ignored. IRQ8# can only be generated internally or on ISA.
29
32
35
38
41
Ignored. IRQ13 can only be generated from FERR#
44
Do not include in BM IDE interrupt logic
47
Do not include in BM IDE interrupt logic
50
Same as ISA IOCHCK# going active.
53
Drive PIRQA#
56
Drive PIRQB#
59
Drive PIRQC#
62
Drive PIRQD#
5-62
82801BA ICH2 and 82801BAM ICH2-M Datasheet