MSM486SV Board Is Hanging With Wrong Memorysize Datasheet

MSM486SV Powerup and Hyperspeed

MSM486SV V2.00 V2.04

MSM486SV Board is hanging with wrong memorysize (AMD Errata P14):

Problem:

The ELAN400 need to be on real 0 Volt befor powerup, otherwise the RTC is in a undefined state. The Errata P14 from AMD describe the problem, that a max. of 0.06V is allowed befor appling the powersupply on VCC.

Since the powersupply generate the 3.3V with a switched mode regulator, much more capacitors are onboard. This capacitors must be discharged fully befor a new poweron may be occure.

The newest BIOS V2.04 will handle the memorysize problem better, if you receive the case, that the RTC is not accessible and the size is fully wrong.

Solution Work Around:

None, Ensure that when the system is powered down, that the capacitors are fully discharged (smaler than 0.06V)

Longterm:

None, Fix is planned from AMD

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