Table 561: 100-Tx Port Cable Length - Broadcom BCM5722 Programmer's Manual

Programmer's Guide
10/15/07
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.
Cable Length 100X[2:0]
000
001
010
011
100
101
110
111
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.
Document 5722-PG101-R

Table 561: 100-TX Port Cable Length

Cable Length in Meters
< 20
20 to < 40
40 to < 60
60 to < 80
80 to < 100
100 to < 120
120 to < 140
> 140
Bro adco m Co rp or atio n
Transceiver Registers (BCM5906/BCM5906M)
BCM5722
Page 510