Intel Pentium 4 Processor Extreme Edition on 0.13 Micron Process in the 775-Land Package Datasheet

67 Datasheet
Land Listing and Signal Descriptions
TRST# Input
TRST# (Test Reset) resets the Test Access Port (TAP) logic. TRST# must be
driven low during power on Reset. Contact your Intel representative for
complete implementation details.
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.
NOTE: VCCA is for compatible processors. VCCA is not used in the Pentium 4
processor Extreme Edition in 775-land package. Contact your Intel
representative for further details and documentation.
VCCIOPLL Input
VCCIOPLL
provides isolated power for internal processor FSB PLLs.
NOTE: VCCIOPLL is for compatible processors. VCCIOPLL is not used in the
Pentium 4 processor Extreme Edition in 775-land package. Contact
your Intel representative for further details and documentation.
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.
VCC_MB_
REGULATION
Output
This land is provided as a voltage regulator feedback sense point for V
CC
. It is
connected internally in the processor package to the sense point land U27 as
described in the Voltage Regulator-Down (VRD) 10.1 Design Guide for Desktop
and Transportable Socket 775.
VID[5:0] Output
VID[5:0] (Voltage ID) signals are used to support automatic selection of power
supply voltages (V
CC
). These are open drain signals that are driven by the
Pentium 4 processor Extreme Edition in the 775-land package and must be
pulled up on the motherboard. Refer to the Voltage Regulator-Down (VRD) 10.1
Design Guide for Desktop and Transportable Socket 775 for more information.
The voltage supply for these signals 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 signals becomes valid. The VID signals are needed
to support the processor voltage specification variations. See Table 2-1 for
definitions of these signals. The VR must supply the voltage that is requested
by the signals, or disable itself.
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.
NOTE: VSSA is for future and compatible processors. VSSA is not used in the
Pentium 4 processor Extreme Edition in 775-land package.
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.
VSS_MB_
REGULATION
Output
This land is provided as a voltage regulator feedback sense point for V
SS
. It is
connected internally in the processor package to the sense point land V27 as
described in the Voltage Regulator-Down (VRD) 10.1 Design Guide for Desktop
and Transportable Socket 775.
VTT Miscellaneous voltage supply.
Table 4-3. Signal Description (Sheet 1 of 9)
Name Type Description