Electrical Specifications
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.
2.4.2
Phase Lock Loop (PLL) Power and Filter
V
and V
are power sources required by the PLL clock generators on the Mobile Intel
CCIOPLL
CCA
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
. A typical filter topology is shown in Figure 2.
CCVID
The AC low-pass requirements, with input at V
and output measured across the capacitor
CCVID
(C or C in Figure 2), is as follows:
A
IO
• < 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 Figure 3. For recommendations on implementing the filter
refer to the Mobile Intel Pentium 4 Processor-M and Intel 845MP/845MZ Chipset Platform
Design Guide.
Figure 2. Typical V
, V
and V
Power Distribution
CCIOPLL
CCA
SSA
VCCVID
L
VCCA
CA
PLL
Processor
Core
VSSA
VCCIOPLL
CIO
L
Mobile Intel Pentium 4 Processor-M Datasheet
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INTEL [ INTEL ]
