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Datasheet

Electrical Specifications

2.13

GTL+ FSB Specifications

Termination resistors are not required for most GTL+ signals; they 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 GTLREF. Table 2-18 lists the GTLREF specifications. The GTL+

reference voltage (GTLREF) should be generated on the system board using high precision voltage

divider circuits.

Table 2-18. GTL+ Bus Voltage Definitions

Symbol

Parameter

Min

Typ

Max

Units

Notes1

NOTES:

Unless otherwise noted, all specifications in this table apply to all processor frequencies.

GTLREF_compatible

Bus Reference Voltage

0.98 * (2/3 VCC)2/3 VCC

1.02 * (2/3 VCC)V

2,3,4,5

The tolerances for this specification have been stated generically to enable the system designer to calculate the mini-

mum and maximum values across the range of VCC.

GTLREF should be generated from VCC by a voltage divider of 1% resistors or 1% matched resistors.

The VCC referred to in these specifications is the instantaneous VCC.

These specifications are different depending on whether the platform is forward compatible to the Celeron D processor

or if it is optimized for the Celeron D processor. A compatible platform is one that is designed for a previous generation

processor but has some level of compatibility with the Celeron D processor. An optimized platform is one designed spe-

cifically for the Celeron D processor; however, it may have some level of compatibility with previous generation proces-

sors.

GTLREF_optimized

Bus Reference Voltage

(0.98 * 0.63) * VCC 0.63 * VCC (1.02 * 0.63) * VCC

2,3,4,5

R_pullup

On die pull-up for

BOOTSELECT and

OPTIMIZED/

COMPAT# pins

500

—

5000

Ω

5,6

These pull-ups are to the internal VCCVID supply.

_compatible

Termination

Resistance

Ω

5,7

RTT is the on-die termination resistance measured at VCC/2 of the GTL+ output driver.

_optimized

Termination

Resistance

Ω

COMP[1:0]_compatible

COMP Resistance

49.4

49.9

50.4

Ω

5,8

COMP resistance must be provided on the system board with 1% resistors.

COMP[1:0]_optimized

COMP Resistance

61.3

61.9

62.5

Ω

5,8

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