Programmer’s Guide BCM5722
10/15/07
Broadcom Corporation
Document 5722-PG101-R Transceiver Registers (BCM5906/BCM5906M) Page 510
MLT3 Detected
The PHY returns a 1 in this bit whenever MLT3 signaling is detected.
Cable Length 100X[2:0]
The PHY provides the cable length for each port when a 100-TX link is established.
APD Enable
When in normal mode, if this bit is set to a 1, the PHY enters auto power-down mode. If this bit is set and the link is lost, the
PHY enters low power-down mode. When energy is detected, the device enters full power mode. Otherwise, it wakes up
after either 2.5 seconds or 5.0 seconds, as determined by the APD Sleep Timer bit. When the PHY wakes up, it sends link
pulses and also monitors energy. If the link partner’s energy is detected, the PHY device continues to stay in wake-up mode
for a duration determined by the APD wake-up timer before going to low power mode.
APD Sleep Timer
This bit determines how long the PHY stays in low power mode before waking up. If this bit is a 0, the PHY device waits
approximately 2.5 seconds before waking up. Otherwise, it wakes up after approximately 5.0 seconds.
APD Wake-Up Timer[3:0]
This counter determines how long the PHY stays in wake-up mode before going to low power mode. This value is specified
in 40-millisecond increments from 0 to 600 milliseconds. A value of 0 forces the PHY to stay in low power mode indefinitely.
In this case, the PHY requires a hard reset to return to normal mode.
Table 561: 100-TX Port Cable Length
Cable Length 100X[2:0] Cable Length in Meters
000 < 20
001 20 to < 40
010 40 to < 60
011 60 to < 80
100 80 to < 100
101 100 to < 120
110 120 to < 140
111 > 140
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