307013-003 Datasheet, PDF (69/848 Pages) Intel Corporation – Intel I/O Controller Hub 7

Signal Description
2.16 Real Time Clock Interface
Table 2-16. Real Time Clock Interface
Name
Type
Description
RTCX1
RTCX2
Special
Special
Crystal Input 1: This signal is connected to the 32.768 kHz crystal. If
no external crystal is used, RTCX1 can be driven with the desired clock
rate.
Crystal Input 2: This signal is connected to the 32.768 kHz crystal. If
no external crystal is used, RTCX2 should be left floating.
2.17 Other Clocks
Table 2-17. Other Clocks
Name
Type
Description
CLK14
CLK48
SATA_CLKP
SATA_CLKN
(Desktop
and Mobile
Only)
DMI_CLKP,
DMI_CLKN
Oscillator Clock: This clock signal is used for the 8254 timers. It runs at
I 14.31818 MHz. This clock is permitted to stop during S3 (or lower)
states.
48 MHz Clock: This clock signal is used to run the USB controller. It runs
I at 48.000 MHz. This clock is permitted to stop during S3 (or lower)
states.
100 MHz Differential Clock: These signals are used to run the SATA
I controller at 100 MHz. This clock is permitted to stop during S3/S4/S5
states.
I
100 MHz Differential Clock: These signals are used to run the Direct
Media Interface. They run at 100 MHz.
Intel ^® ICH7 Family Datasheet
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