82801FB Datasheet, PDF (77/786 Pages) Intel Corporation – Intel I/O Controller Hub 6 (ICH6) Family

Signal Description
VccLAN3_3 (mobile only) must power up before VccLAN1_5 (mobile only) or after VccLAN1_5
within 0.7 V. VccLAN1_5 must power down before VccLAN3_3 or after VccLAN3_3 within
0.7 V.
2.22.3.3
3.3 V/2.5 V Power Sequencing Requirements
For platforms that use the integrated 2.5 V regulator, there are no power sequencing requirements
for associated 3.3 V/2.5 V rails of the ICH6.
For platforms that use an external 2.5 V regulator to power Vcc2_5 of the ICH6 (the internal
voltage regulator is disabled), the platform must ensure that Vcc3_3 must power up before Vcc2_5
or after Vcc2_5 within 0.7 V.
2.22.3.4
Vcc1_5/V_Processor_IO Power Sequencing Requirements
Vcc1_5 must power up before V_CPU_IO or after V_CPU_IO within 0.3 V. V_CPU_IO must
power down before Vcc1_5 or after Vcc1_5 within 0.7 V.
Note: Loaded from EEPROM. If EEPROM contains either 0000h or FFFFh in the device ID location,
then 266Ch is used. Refer to the ICH6 EEPROM Map and Programming Guide for LAN Device
IDs.
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Intel^® I/O Controller Hub 6 (ICH6) Family Datasheet
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