DP83849IFVSSLASHNOPB datasheet(98/108 Pages) TI2

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DP83849IF

SNOSAX8D – JUNE 2009 – REVISED APRIL 2013

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10.3.10 Link Quality Data Register (LQDR), Page 2

This register provides read/write control of thresholds for the 100Mb Link Quality Monitor function. The

not be written if the device is powered-down.

Table 10-35. Link Quality Data Register (LQDR), address 1Eh

Bit

Bit Name

Default

Description

15:14

RESERVED

0, RO

RESERVED: Writes ignored, read as 0.

SAMPLE_PARAM

0, RW

Sample DSP Parameter:

Setting this bit to a 1 enables reading of current parameter values and initiates

sampling of the parameter value. The parameter to be read is selected by the

LQ_PARAM_SEL bits.

WRITE_LQ_THR

0, RW

Write Link Quality Threshold:

Setting this bit will cause a write to the Threshold register selected by

LQ_PARAM_SEL and LQ_THR_SEL. The data written is contained in

LQ_THR_DATA. This bit will always read back as 0.

11:9

LQ_PARAM_SEL

0, RW

Link Quality Parameter Select:

This 3-bit field selects the Link Quality Parameter. This field is used for sampling

current parameter values as well as for reads/writes to Threshold values. The

following encodings are available:

000: DEQ_C1

001: DAGC

010: DBLW

011: Frequency Offset

100: Frequency Control

LQ_THR_SEL

0, RW

Link Quality Threshold Select:

This bit selects the Link Quality Threshold to be read or written. A 0 selects the

Low threshold, while a 1 selects the high threshold. When combined with the

LQ_PARAM_SEL field, the following encodings are available {LQ_PARAM_SEL,

LQ_THR_SEL}:

000,0: DEQ_C1 Low

000,1: DEQ_C1 High

001,0: DAGC Low

001,1: DAGC High

010,0: DBLW Low

010,1: DBLW High

011,0: Frequency Offset Low

011,1: Frequency Offset High

100,0: Frequency Control Low

100,1: Frequency Control High

7:0

LQ_THR_DATA

0, RW

Link Quality Threshold Data:

The operation of this field is dependent on the value of the Sample_Param bit.

If Sample_Param = 0:

On a write, this value contains the data to be written to the selected Link Quality

Threshold register.

On a read, this value contains the current data in the selected Link Quality

Threshold register.

If Sample_Param = 1:

On a read, this value contains the sampled parameter value. This value will

remain unchanged until a new read sequence is started.

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