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Prestigio Cavaliere 141
5. Pin Descriptions of Major Components
5.1 Mobile Intel Pentium 4 Processor-M
Pin Name
Type/No.
VCCSENSE
Output
VCCSENSE is an isolated low impedance connection to processor
core power (VCC). It can be used to sense or measure power near the
silicon with little noise.
VCCVID
Input
Independent 1.2-V supply must be routed to VCCVID pin for the
Mobile Intel Pentium 4 Processor-M's Voltage Identification circuit.
VID[4:0]
Output
VID[4:0] (Voltage ID) pins are used to support automatic selection of
power supply voltages (Vcc). Unlike some previous generations of
processors, these are open drain signals that are driven by the Mobile
Intel Pentium 4 Processor-M and must
be pulled up to 3.3V (max.) with 1Kohm resistors. The voltage supply
for these pins must be valid before the VR can supply Vcc to the
processor. Conversely, the VR output must be disabled until the
voltage supply for the VID pins becomes valid. The VID pins are
needed to support the processor voltage specification variations.The
VR must supply the voltage that is requested by the pins, or disable
itself.
V
Input
V
is the isolated ground for internal PLLs.
SSA
SSA
V
Output
V
is an isolated low impedance connection to processor core
SSSENSE
SSSENSE
V
. It can be used to sense or measure ground near the silicon with
SS
little noise.
Descr iption
78
Technical Service Manual
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