DP83849IF datasheet(83/108 Pages) NSC

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7.3.10 Link Quality Data Register (LQDR), Page 2

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

vides a mechanism for reading current adapted parameter values. Threshold values may not be written if the device is

powered-down

Table 52. 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 con-

tained 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 en-

codings 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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