EP82562ET Datasheet, PDF (18/40 Pages) Intel Corporation – 10/100 Mbps Platform LAN Connect (PLC)

82562ET — Networking Silicon
4.3
Analog References
The 82562ET 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. Resistors of 1%
tolerance should be used.
Figure 5. Analog References
549 1%
619 1%
82562
RBIAS10
RBIAS100
4.4
4.4.1
Dynamic Reduced Power & Auto Plugging Detection
The 82562ET can be configured to support a dynamic reduced power mode. This mode reduces
power consumption of the 82562ET 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 82562ET 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
82562ET 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 MII
Management Interface (MMI) registers. In this mode, the 82562ET switches to the 10 Mbps speed
interface (5 MHz for LAN Connect). Thus, the reduced power mode is fully transparent to driver.
Auto Plugging Detection
The 82562ET senses the link all the time. If it detects loss of any link activity for more than 6.6
seconds, it indicates to the Media Access Controller (MAC) an “unplugged state” by resetting the
SQL LAN Connect control bit. If the 82562ET is in reduced power mode and link activity is
detected, the 82562ET notifies the MAC (in less than 1 second) that it is in a “plugged state” by
setting the SQL LAN Connect control bit. Link activity detection is based on energy detection.
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Datasheet