Intel Celeron D Processor 3xx Sequence

Datasheet 61
Pin Listing and Signal Descriptions
§
VCC Input
VCC are the power pins for the processor. The voltage supplied to these pins is
determined by the VID[5:0] pins.
VCCA Input
VCCA provides isolated power for the internal processor core PLLs. Refer to the
applicable chipset platform design guide for complete implementation details.
VCCIOPLL Input
VCCIOPLL
provides isolated power for internal processor FSB PLLs. Follow the
guidelines for VCCA, and refer to the applicable chipset platform design guide
for complete implementation details.
VCC_SENSE Output
VCC_SENSE is an isolated low impedance connection to processor core power
(V
CC
). It can be used to sense or measure voltage near the silicon with little
noise.
VCCVID Input
1.2 V is required to be supplied to the VCCVID pin if the platform is going to
support the Celeron D processor. Refer to the applicable chipset platform design
guide for more information.
VCCVIDLB Input
1.2 V is required to be supplied to the VCCVIDLB pin if the platform is going to
support the Celeron D processor. Refer to the applicable chipset platform design
guide for more information.
VID[5:0] Output
VID[5:0] (Voltage ID) pins are used to support automatic selection of power
supply voltages (V
CC
). These are open drain signals that are driven by the
Celeron D processor and must be pulled up to 3.3 V with 1 kΩ 5% resistors. The
voltage supply for these pins must be valid before the VR can supply V
CC
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. See Table 2-2 for definitions of these
pins. The VR must supply the voltage that is requested by the pins, or disable
itself.
VIDPWRGD Input
The processor requires this input to determine that the VCCVID and VCCVIDLB
voltages are stable and within specification.
VSS Input
VSS are the ground pins for the processor and should be connected to the
system ground plane.
VSSA Input VSSA is the isolated ground for internal PLLs.
VSS_SENSE Output
VSS_SENSE is an isolated low impedance connection to processor core V
SS
. It
can be used to sense or measure ground near the silicon with little noise.
Table 4-3. Signal Description (Sheet 8 of 8)
Name Type Description