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Electrical Specifications

Datasheet 45

3.13 AGTL+ FSB Specifications

Termination resistors are not required for most AGTL+ signals, as these are integrated

into the processor silicon.

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

voltage with a reference voltage called GTLREF (known as V

REF

in previous

documentation).

Table 11 lists the GTLREF and CMREF specifications. The AGTL+ and CMOS reference

voltages (GTLREF and CMREF) should be generated on the system board using high

precision voltage divider circuits. It is important that the system board impedance is

held to the specified tolerance, and that the intrinsic trace capacitance for the AGTL+

signal group traces is known and well- controlled.

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Intel AC80566UC005DE Arkusz Danych Strona 45