AMD AMD-K6-2/400 User Guide - Page 158
VCC2H/L# (VCC2 High/Low
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Preliminary Information AMD-K6™-2E+ Embedded Processor Data Sheet 23542A/0-September 2000 5.52 VCC2H/L# (VCC2 High/Low) Pin Attribute Output (supported on the CPGA package only) Summary VCC2H/L# is internally tied to VSS (logic level 0) to indicate to the system logic that it must supply the specified processor core voltage to the VCC2 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 to identify dual-voltage processor requirements, system logic should sample VCC2H/L# to identify the core voltage requirements: 2.9-V and 3.2-V products (High) or 2.4-V and lower products (Low). s VCC2H/L# is only driven High on older legacy (0.35-micron process technology) AMD-K6 processors to indicate core voltages of 2.9 V and 3.2 V. s VCC2H/L# is driven Low for all AMD-K6 processors with a core voltage requirement of 2.4 V or less. Note that all AMD products based on the 0.18-micron process technology, including the AMD-K6-2E+ processor, are 2.0 V or less. Driven Note that this pin is not supported on the OBGA package. VCC2H/L# always equals 0 and is never floated for 2.4 -V and lower products - even during the Three-State Test mode. To ensure proper operation for 2.9 -V and 3.2-V products, system logic that samples VCC2H/L# should design a weak pullup resistor for this signal. Table 18. Output Pin Float Conditions for VCC2 High/Low Name VCC2DET1 VCC2H/L#1 Floated At: Always Driven Always Driven Notes: 1. All outputs except VCC2DET, VCC2H/L#, and TDO float during the Three-State Test mode. 136 Signal Descriptions Chapter 5