82563EB Datasheet, PDF (11/52 Pages) Intel Corporation – Intel® 82563EB/82564EB Gigabit Ethernet Controllers

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 KΩ:
and 130 KΩ.
• 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
5