82562G datasheet(21/44 Pages) INTEL

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Networking Silicon — 82562G

Datasheet

• Differential pulses of peak magnitude less than 300 mV.

• Continuous sinusoids with a differential amplitude less than 6.2 VPP and frequency less than 2

MHz.

• Sine waves of a single cycle duration starting with 0° or 180° phase that have a differential

amplitude less than 6.2 VPP and a frequency of at least 2 MHz and not more than 16 MHz.

These single-cycle sine waves are discarded only if they are preceded by 4 bit times (400 ns)

of silence.

All other activity is determined to be either data, link test pulses, Auto-Negotiation fast link pulses,

or the idle condition.

5.3

Analog References

The 82562G has two inputs, RBIAS100 and RBIAS10, that require external resistor connections to

set biases for its internal analog section. The input pins are sensitive to the resistor value and

experimentation is required to determine the correct values for any given layout. Note that the

values listed in Figure 4 are starting values. Also, resistors of 1% tolerance should be used.

5.4

Dynamic Reduced Power & Auto Plugging Detection

The 82562G can be configured to support a dynamic reduced power mode. This mode reduces

power consumption of the 82562G when LAN activity is not present. The reduced power mode

decreases power consumption from 300 mW to about 50 mW and is based on automatic detection

of cable plugging. If the 82562G is configured to support dynamic power reduction, it enters the

reduced power mode whenever a cable is not connected to the device. In reduced power mode, the

82562G shuts off the link circuits, except the circuit used for the automatic plugging detection. On

the LAN Connect side, the entire interface remains active, including full access to all Media

Independent Interface (MII) registers. In this mode, the 82562G switches to the 10 Mbps speed

interface (5 MHz for LAN Connect). Thus, the reduced power mode is fully transparent to driver.

Figure 4. Analog References

82562

RBIAS100

RBIAS10

619 1%

549 1%

649

Ω 1%

619

Ω 1%

82562G Datasheet(PDF) 21 Page - Intel Corporation