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V5REF / Vcc3_3 Sequencing Requirements
V5REF is the reference voltage for 5 V tolerance on inputs to the ICH6. V5REF must be powered
up before Vcc3_3, or after Vcc3_3 within 0.7 V. Also, V5REF must power down after Vcc3_3, or
before Vcc3_3 within 0.7 V. The rule must be followed in order to ensure the safety of the ICH6. If
the rule is violated, internal diodes will attempt to draw power sufficient to damage the diodes from
the Vcc3_3 rail.
This rule also applies to V5REF_Sus and VccSus3_3. However, in most platforms, the VccSus3_3
rail is derived from the 5 VSB on the power supply through a voltage regulator and therefore, the
VccSus3_3 rail will always come up after the VccSus5 rail. As a result, V5REF_Sus (which is
derived directly from VccSus5) will always be powered up before VccSus3_3 and thus circuitry to
satisfy the sequence requirement is not needed. However, in platforms that do not derive the
VccSus3_3 rail from the VccSus5 rail, this rule must be observed in the platform design as
described above
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关于INTEL南桥 V5REF 和V5REF_SUS
为什么要这样设计?
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