Global American 3307800, User Manual, Page: 35 / 135

3307800
Page 20
2.5.12 Timers
The ATI SB600 south bridge has the following timers
„ 8254-compatible timer
„ Microsoft High Precision Event Timer (HPET)
„ ACPI power management timer
2.5.13 RTC (Real Time Clock)
256 bytes of battery backed RAM is provided by the real time clock (RTC) integrated into
the ATI SB600. The RTC keeps track of the time and stores system data even when the
system is turned off. Some of the features of the RTC are listed below:
„ 256-byte battery backed CMOS RAM
„ Hardware supported century rollover
„ RTC battery monitoring feature
2.5.14 Power Management
ACPI specification 3.0 compliant power management schemes on the ATI SB600 include:
„ Supports C2, C3, C4
„ Supports C1e and C3 pop-up (AMD platform only)
„ Supports S0, S1, S2, S3, S4, and S4
„ Supports SpeedStep™
„ Full support for On-Now™
„ Supports CPU SMM, generating SMI# signal upon power management events
„ GPIO supports on external wake up events
„ Supports CLKRUN# on PCI power management
„ Provides clock generator and CPU STPCLK# control
„ Hardware monitoring support
„ Support for ASF
2.5.15 Hardware Monitor