Intel Pentium M 730 RH80536GE0252M User Manual

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 4 Processor-M Datasheet  

17

processor to the Battery Optimized mode. INIT# assertions ("soft" resets) and APIC bus INIT 
messages do not change the operating mode of the processor. Some electrical and thermal 
specifications are for a specific voltage and frequency. The Mobile Intel Pentium 4 Processor-M 
featuring Enhanced Intel SpeedStep technology will meet the electrical and thermal specifications 
specific to the current operating mode, and it is not guaranteed to meet the electrical and thermal 
specifications specific to the opposite operating mode. The timing specifications must be met when 
performing an operating mode transition.

V

CCA

 and V

CCIOPLL

 are power sources required by the PLL clock generators on the Mobile Intel 

Pentium 4 Processor-M silicon. Since these PLLs are analog in nature, they require quiet power 
supplies for minimum jitter. Jitter is detrimental to the system: it degrades external I/O timings as 
well as internal core timings (i.e. maximum frequency). To prevent this degradation, these supplies 
must be low pass filtered from V

CCVID

. A typical filter topology is shown in 

. 

The AC low-pass requirements, with input at V

CCVID

 and output measured across the capacitor 

(C

A

 or C

IO

), is as follows:

•

< 0.2 dB gain in pass band

•

< 0.5 dB attenuation in pass band < 1 Hz

•

> 34 dB attenuation from 1 MHz to 66 MHz

•

> 28 dB attenuation from 66 MHz to core frequency

The filter requirements are illustrated in 

. For recommendations on implementing the filter 

refer to the Mobile Intel

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Design Guide.

V

CCVID

VCCA

VSSA

VCCIOPLL

L

L

Processor

Core

PLL

C

A

C

IO