82563EB datasheet(11/52 Pages) INTEL

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82563EB/82564EB Gigabit Platform LAN Connect Networking Silicon

3.0

Signal Descriptions

3.1

Signal Type Definitions

The signals of 82563EB/82564EB are defined as follows:

• I:

Standard input-only signal

• I (T): Functional input signal implemented as a bidirectional for test

• O:

Standard output-only signal

• O (T):Functional output signal implemented as a bidirectional for test

• I/O: Bi-directional, tri-state input/output signal

• A:

Analog signal

• A-in: Analog input signal

• A-o: Analog output signal

• P:

Power signal

• G:

Ground signal

• NC: No connect (these signals must not be connected to any traces or planes)

• B:

Input bias

Signals may be further qualified to indicate whether an internal pull-up or pull-down is normally

active. Unless otherwise stated, internal pull-up and pull-down impedances are between 50 K

Ω:

and 130 K

Ω.

• PU:

Internal pull-up to VDD

• PD:

Internal pull-down to VSS

Note:

It may be desirable to leave some input signals as no-connects in certain system applications that

rely on a device’s internal pull-up or pull-down signal to be active. Care should be taken to ensure

there are no long traces, such as far-away test points or errant trace routings, on any inputs which

rely solely on internal pull-devices. Excess capacitance of dangling traces may generate charge

and/or noise on inputs which exceeds the capability of the internal pull-device, leading to

unpredictable component behavior.

In addition to a primary type, each pin can be classified according to one of the following sub-types

based on its electrical characteristics, such as input and output voltages and drive strengths.

• TTL: TTL compatible inputs

• TTL3: TTL compatible pins with at least 3mA drive strength

• TTL6: TTL compatible pins with at least 6mA drive strength

• TTL8: TTL compatible pins with at least 8mA drive strength

• TTL12:TTL compatible pins with at least 12mA drive strength

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