DP83848Q-Q1 Datasheet, PDF (62/82 Pages) Texas Instruments – MII Serial Management Interface

DP83848Q-Q1
SNLS341C – MARCH 2011 – REVISED MARCH 2015
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5.6.2.10 Energy Detect Control (EDCR)
This register provides control and status for the Energy Detect function.
Table 5-27. Energy Detect Control (EDCR), address 0x1Dh
BIT
BIT NAME
15
ED_EN
14
ED_AUTO_UP
13
ED_AUTO_DOWN
12
ED_MAN
11
ED_BURST_DIS
10
ED_PWR_STATE
9
ED_ERR_MET
8
ED_DATA_MET
7:4
ED_ERR_COUNT
3:0
ED_DATA_COUNT
DEFAULT
0, RW
1, RW
1, RW
0, RW/SC
0, RW
0, RO
0, RO/COR
0, RO/COR
0001, RW
0001, RW
DESCRIPTION
Energy Detect Enable:
Allow Energy Detect Mode.
When Energy Detect is enabled and Auto-Negotiation is disabled via the
BMCR register, Auto-MDIX should be disabled via the PHYCR register.
Energy Detect Automatic Power Up:
Automatically begin power up sequence when Energy Detect Data
Threshold value (EDCR[3:0]) is reached. Alternatively, device could be
powered up manually using the ED_MAN bit (ECDR[12]).
Energy Detect Automatic Power Down:
Automatically begin power down sequence when no energy is detected.
Alternatively, device could be powered down using the ED_MAN bit
(EDCR[12]).
Energy Detect Manual Power Up/Down:
Begin power up/down sequence when this bit is asserted. When set, the
Energy Detect algorithm will initiate a change of Energy Detect state
regardless of threshold (error or data) and timer values.
Energy Detect Burst Disable:
Disable bursting of energy detect data pulses. By default, Energy Detect
(ED) transmits a burst of 4 ED data pulses each time the CD is powered
up. When bursting is disabled, only a single ED data pulse will be send
each time the CD is powered up.
Energy Detect Power State:
Indicates current Energy Detect Power state. When set, Energy Detect is
in the powered up state. When cleared, Energy Detect is in the powered
down state. This bit is invalid when Energy Detect is not enabled.
Energy Detect Error Threshold Met:
No action is automatically taken upon receipt of error events. This bit is
informational only and would be cleared on a read.
Energy Detect Data Threshold Met:
The number of data events that occurred met or surpassed the Energy
Detect Data Threshold. This bit is cleared on a read.
Energy Detect Error Threshold:
Threshold to determine the number of energy detect error events that
should cause the device to take action. Intended to allow averaging of
noise that may be on the line. Counter will reset after approximately 2
seconds without any energy detect data events.
Energy Detect Data Threshold:
Threshold to determine the number of energy detect events that should
cause the device to take actions. Intended to allow averaging of noise
that may be on the line. Counter will reset after approximately 2 seconds
without any energy detect data events.
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Detailed Description
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