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

Datasheet 27

Electrical Specifications

NOTES:

1. V

is measured overshoot voltage.

2. T

is measured time duration above VID.

2.12.1 Die Voltage Validation

Overshoot events from application testing on real processors must meet the specifications in

Table 2-12 when measured across the VCC_SENSE and VSS_SENSE lands. Overshoot events that

are < 10 ns in duration may be ignored. These measurements of processor die level overshoot

should be taken with a 100 MHz bandwidth limited oscilloscope.

2.13 GTL+FSB Specifications

Termination resistors are not required for most GTL+ signals, as these are integrated into the

processor silicon.

Valid high and low levels are determined by the input buffers that compare a signal’s voltage with a

reference voltage called GTLREF0.

Table 2-13 lists the GTLREF0 specifications. The GTL+ reference voltage (GTLREF0) should be

generated on the system board using high precision voltage divider circuits. For more details on

platform design, contact your Intel representative.

Figure 2-2. V

Overshoot Example Waveform

Time

Example Overshoot Waveform

Voltage (V)

VID

VID + 0.050

: Overshoot time above VID

: Overshoot above VID