AMD-K6-IIIE+550ACR AMD (ADVANCED MICRO DEVICES), AMD-K6-IIIE+550ACR Datasheet - Page 173

• Manufacturer Part Number: AMD-K6-IIIE+550ACR
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of AMD-K6-IIIE+550ACR

• Lead Free Status / RoHS Status: Not Compliant

23543A/0—September 2000
Dynamic Core
Frequency Control
Voltage Identification
(VID) Outputs
Chapter 6
For AMD PowerNow! technology core frequency transitions,
the BVC field of the EPM 16-byte I/O block is accessed through
an SMM handler.
Note: System-initiated inquire (snoop) cycles are not supported
AMD PowerNow! technology-enabled processors feature
Voltage ID (VID) outputs to support dynamic control of the
core voltage.
To change the processor core frequency, the SMM handler
initiates core voltage and frequency transitions by writing a
non-zero value to the SGTC field.
This action automatically places the processor into the EPM
Stop Grant state and transitions the CPU core voltage and
frequency to the values specified in the VIDO and IBF fields
of the BVC field.
These outputs serve as inputs to a DC/DC regulator that
supplies the processor core voltage.
Based on its VID[4:0] inputs, the regulator outputs a
corresponding voltage.
For those regulators that do not support VID inputs, the
processor VID[4:0] outputs must be used to manipulate the
regulator’s feedback voltage to vary the regulator output
voltage.
and must be prevented during the EPM Stop Grant state.
AMD PowerNow!™ Technology
AMD-K6™-IIIE+ Embedded Processor Data Sheet
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