307013-003 Datasheet, PDF (95/848 Pages) Intel Corporation – Intel I/O Controller Hub 7

Intel^® ICH7 and System Clock Domains
4 Intel^® ICH7 and System Clock
Domains
Table 4-1 shows the system clock domains. Figure 4-1 and Figure 4-2 show the
assumed connection of the various system components, including the clock generator
in desktop and mobile/ultra mobile systems. For complete details of the system
clocking solution, refer to the system’s clock generator component specification.
Table 4-1. Intel^® ICH7 and System Clock Domains
Clock Domain
Intel^® ICH7
SATA_CLKP,
SATA_CLKN
(Desktop and
Mobile only)
ICH7
DMI_CLKP,
DMI_CLKN
ICH7
PCICLK
System PCI
ICH7
CLK48
ICH7
CLK14
ICH7
ACZ_BIT_CLK
(Desktop and
Mobile only)
LAN_CLK
(Desktop and
Mobile only)
SPI_CLK
(Desktop and
Mobile Only)
Frequency
100 MHz
100 MHz
33 MHz
33 MHz
48.000 MHz
14.31818
MHz
12.288 MHz
5 to 50 MHz
17.86 MHz
Source
Main Clock
Generator
Main Clock
Generator
Main Clock
Generator
Main Clock
Generator
Main Clock
Generator
Main Clock
Generator
AC ’97 Codec
LAN Connect
Component
ICH
Usage
Differential clock pair used for SATA.
Differential clock pair used for DMI.
Free-running PCI Clock to ICH7. This clock
remains on during S0 and S1 (in desktop) state,
and is expected to be shut off during S3 or
below in desktop configurations or S1 or below
in mobile/ultra mobile configurations.
PCI Bus, LPC I/F. These only go to external PCI
and LPC devices. Will stop based on CLKRUN#
(and STP_PCI#) in mobile/ultra mobile
configurations.
Super I/O, USB controllers. Expected to be shut
off during S3 or below in desktop configurations
or S1 or below in mobile/ultra mobile
configurations.
Used for ACPI timer and Multimedia Timers.
Expected to be shut off during S3 or below in
desktop configurations or S1 or below in mobile/
ultra mobile configurations.
AC-link. Generated by AC ’97 Codec. Can be
shut by codec in D3. Expected to be shut off
during S3 or below in desktop configurations or
S1 or below in mobile configurations.
NOTE: For use only in AC ‘97 mode.
Generated by the LAN Connect component.
Expected to be shut off during S3 or below in
desktop configurations or S1 or below in mobile
configurations.
Generated by the LAN Connect component.
Expected to be shut off during S3 or below in
desktop configurations or S1 or below in mobile
configurations.
Intel ^® ICH7 Family Datasheet
95