AMD AMD-K6-2/400 User Guide - Page 157
VCC2DET (VCC2 Detect
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23542A/0-September 2000 Preliminary Information AMD-K6™-2E+ Embedded Processor Data Sheet 5.51 VCC2DET (VCC2 Detect) Pin Attribute Summary Output (supported on the CPGA package only) VCC2DET is internally tied to VSS (logic level 0) to indicate to the system logic that it must supply the specified dual-voltage requirements to the VCC2 and VCC3 pins. The VCC2 pins supply voltage to the processor core, independent of the voltage supplied to the I/O buffers on the VCC3 pins. Upon sampling VCC2DET Low, system logic should sample VCC2H/L# to identify core voltage requirements Note that this pin is not supported on the OBGA package. Driven VCC2DET always equals 0 and is never floated-even during the Three-State Test mode. Chapter 5 Signal Descriptions 135