Intel Pentium 4 Processor in the 478-PinPackage at 1.40 GHz, 1.50 GHz, 1.60 GHz, 1.70 GHz, 1.80 GHz, 1.90 GHz, and 2GHz

Pin Listing and Signal Definitions
76 Datasheet
V
CCSENSE
Output
V
CCSENSE
is an isolated low impedance connection to processor core power
(V
CC
). It can be used to sense or measure power near the silicon with little noise.
VCCVID Input
There is no imput voltage requirement for VCCVID for designs intended to
support only the Pentium 4 processor in the 478-pin package. Refer to the
appropriate Platform Design Guide for more information.
VID[4:0] Output
VID[4:0] (Voltage ID) pins can be used to support automatic selection of power
supply voltages (Vcc). These pins are not signals, but are either an open circuit
or a short circuit to VSS on the processor. The combination of opens and shorts
defines the voltage required by the processor. The VID pins are needed to
cleanly support processor voltage specification variations. See Table 2 for
definitions of these pins. The power supply must supply the voltage that is
requested by these pins, or disable itself.
V
SSA
Input V
SSA
is the isolated ground for internal PLLs.
V
SSSENSE
Output
V
SSSENSE
is an isolated low impedance connection to processor core V
SS
.Itcan
be used to sense or measure ground near the silicon with little noise
Table 32. Signal Description (Sheet 8 of 8)
Name Type Description