FW82371EB Intel, FW82371EB Datasheet - Page 27

• Manufacturer Part Number: FW82371EB
• Manufacturer: Intel

Specifications of FW82371EB

• Lead Free Status / RoHS Status: Not Compliant

20.
Problem:
Implication: System hang due to the “inaccuracy” of the timer when used by software for time critical events and
Workaround: Read the register twice and compare.
Status:
21.
Problem:
Implication: The system time may not be correct after the daylight savings time change. The first manifestation of this
Workaround: 1) If using Microsoft Windows 95/98 or Windows NT4.0 operating systems, leave the system on and the
Status:
Specification Update
R
ACPI Timer Errata
The power management timer may return improper result when read. Although the timer value settles
properly after incrementing, while incrementing there is a 3nS window every 69.8nS where the timer
value is indeterminate (a 4.2% chance that the data will be incorrect when read). As a result, the ACPI
free running count up timer specification is violated due to erroneous reads.
delays.
This will not be fixed in the PIIX4 or PIIX4E.
Daylight Savings Time Errata
If the last Sunday in October is the 30th or 31st, and the daylight savings enable bit in the PIIX4E is set,
the PIIX4E will not correctly adjust the time back one hour from 1:59:59 to 1:00:00am.
will be on October 31st 1999.
operating system running at 1:59:59am on the last Sunday of October. Some operating systems will
correctly detect the time change and correct the PIIX4E’s CMOS time settings. 2) After the daylight
savings fallback occurs, change the time manually, using either an operating system date/time function,
or the BIOS setup. 3) Contact your system provider to see if there is a BIOS update available that
corrects this condition.
This will not be fixed in the PIIX4E. It will be corrected in future chipset implementations
Intel
®
82371EB (PIIX4E)
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