82NM10 Datasheet, PDF (126/671 Pages) Intel Corporation – Intel® NM10 Family Express Chipset

Functional Description
Table 5-48.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. Will set the SERIRQ_SMI_STS bit.
11
14
17
20
23
26
Ignored. IRQ8# can only be generated internally.
29
32
35
38
41
Ignored. IRQ13 can only be generated from FERR#
44
Not attached to SATA logic
47
Not attached to SATA logic
50
Same as ISA IOCHCK# going active.
53
Drive PIRQA#
56
Drive PIRQB#
59
Drive PIRQC#
62
Drive PIRQD#
5.12
Real Time Clock (D31:F0)
The Real Time Clock (RTC) module provides a battery backed-up date and time keeping
device with two banks of static RAM with 128 bytes each, although the first bank has
114 bytes for general purpose usage. Three interrupt features are available: time of
day alarm with once a second to once a month range, periodic rates of 122 µs to
500 ms, and end of update cycle notification. Seconds, minutes, hours, days, day of
week, month, and year are counted. Daylight savings compensation is available. The
hour is represented in twelve or twenty-four hour format, and data can be represented
in BCD or binary format. The design is functionally compatible with the Motorola
MS146818B. The time keeping comes from a 32.768 kHz oscillating source, which is
divided to achieve an update every second. The lower 14 bytes on the lower RAM block
has very specific functions. The first ten are for time and date information. The next
four (0Ah to 0Dh) are registers, which configure and report RTC functions.
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Datasheet