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

16 Datasheet

Electrical Specifications

2.3.1 V

Decoupling

Regulator solutions need to provide bulk capacitance with a low Effective Series Resistance (ESR)

and keep a low interconnect resistance from the regulator to the socket. Bulk decoupling for the

large current swings when the part is powering on, or entering/exiting low power states, must be

provided by the voltage regulator solution (VR). In addition, a sufficient quality of low ESR

ceramic capacitors are required in the socket cavity to ensure proper high frequency noise

suppression. For more details on this topic, contact your Intel representative for further

documentation and the Voltage Regulator-Down (VRD) 10.1 Design Guide for Desktop and

Transportable Socket 775.

2.3.2 FSB GTL+ Decoupling

The Pentium 4 processor Extreme Edition in the 775-land package integrates signal termination on

the die as well as incorporating high frequency decoupling capacitance on the processor package.

Decoupling must also be provided by the system baseboard for proper GTL+ bus operation. For

more information and documentation, contact your Intel representative.

2.4 Voltage Identification

The VID specification for the Pentium 4 processor Extreme Edition in the 775-land package is

supported by the Voltage Regulator-Down (VRD) 10.1 Design Guide for Desktop and

Transportable Socket 775. The voltage set by the VID signals is the reference VR output voltage to

be delivered to the processor VCC pins. The specifications have been set such that one voltage

regulator can work with all supported frequencies.

Individual processor VID values may be calibrated during manufacturing such that two devices at

the same speed may have different VID settings.

The Pentium 4 processor Extreme Edition in the 775-land package uses six voltage identification

signals, VID[5:0], to support automatic selection of power supply voltages. Table 2-1 specifies the

voltage level corresponding to the state of VID[5:0]. A ‘1’ in this table refers to a high voltage level

and a ‘0’ refers to low voltage level. If the processor socket is empty (VID[5:0] = 111111), or the

voltage regulation circuit cannot supply the voltage that is requested, it must disable itself. See the

Voltage Regulator-Down (VRD) 10.1 Design Guide for Desktop and Transportable Socket 775 for

more details.

Table 2-1. Voltage Identification Definition

VID5 VID4 VID3 VID2 VID1 VID0 VID

101101 1.5250

101100 1.5500

101011 1.5750

101010 1.6000