CS6420-CS datasheet(16/52 Pages) CIRRUS

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CS6420

DS205PP2

* Denotes reset value

Table 5. Register 2 Bit Definitions

NErle - Network ERLE Threshold

The CS6420 will allow full-duplex operation only

when the Network ERLE exceeds the threshold set

by NErle. See also NFNse. See Glossary for a def-

inition of ERLE.

NFNse - Network Full-Duplex Noise Threshold

NFNse works in conjunction with NErle to deter-

mine when the CS6420 should transition into full-

duplex operation. If the current noise level at the

far-end input is greater than NFNse, then NErle is

used to determine if full-duplex is allowed. If the

noise level is below the level of NFNse, the

CS6420 uses an internal estimate of asymptotic

performance to determine whether or not to transi-

tion to full-duplex. If NFNse is zero, NErle is al-

ways used as the full-duplex criterion. The other

values exist for cases where there is not a network

path to converge to, or the existence of a network

path can not be determined prior to placing a call.

b15

b14

b13

b12

b11

b10

NErle

NFNse

RHDet

HDly

NseRmp

RSThd

PCSen

Bits

Name

Function

Word

Operation

15-14

NErle

NEC ERLE Threshold

00*

24 dB

18 dB

30 dB

reserved

13-12

NFNse

NEC Full-Duplex Noise Threshold

00*

zero

-42 dB

-54 dB

reserved

11-10

RHDet

Rx Half-Duplex Detection Threshold

00*

5 dB

3 dB

6 dB

reserved

9-8

HDly

Half-Duplex Holdover Delay

00*

200 ms

100 ms

150 ms

reserved

7-6

NseRmp

Background Power Estimator Ramp Rate

00*

1 s

0.5 s

2 s

reserved

5-4

RSThd

Rx Suppression Threshold

00*

5 dB

3 dB

6 dB

reserved

PCSen

Path Change Sensitivity

high sensitivity

low sensitivity

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