AMD-K6-2ESLASH233AMZ datasheet(145/332 Pages) AMD

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Chapter 5

Signal Descriptions

127

22529B/0—January 2000

AMD-K6™-2E Processor Data Sheet

Preliminary Information

5.52

VCC2H/L# (VCC2 High/Low)

Pin Attribute

Output

Pin Location

AN-05

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 for 2.9 V and 3.2 V

products (High) or 2.4 V, 2.2 V, and 1.9 V products (Low).

Driven

VCC2H/L# always equals 0 and is never floated for 2.4 V, 2.2 V,

and 1.9 V 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.

The output pin float conditions for VCC2DET and VCC2H/L#

are listed in Table 17.

Table 17. Output Pin Float Conditions

Name

Floated At:

VCC2DET1

Notes:

1. All outputs except VCC2DET, VCC2H/L#, and TDO float during the three-state test mode.

Always Driven

VCC2H/L#

Always Driven

AMD-K6-2E/233AMZ Datasheet(PDF) 145 Page - Advanced Micro Devices