CDB6420 Cirrus Logic Inc, CDB6420 Datasheet - Page 16
CDB6420
Manufacturer Part Number
CDB6420
Description
Development Kit
Manufacturer
Cirrus Logic Inc
Datasheet
1.CDB6420.pdf
(52 pages)
Specifications of CDB6420
Silicon Manufacturer
Cirrus Logic
Application Sub Type
Speakerphone
Kit Application Type
Audio / Video / TV
Silicon Core Number
CS6420
Kit Contents
Board
Kit Features
Analog And Digital Patch Area
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Register 2
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
16
b15
15-14
13-12
11-10
Bits
9-8
7-6
5-4
NErle
3
00
b14
* Denotes reset value
b13
NseRmp
NFNse
RSThd
PCSen
RHDet
Name
NErle
NFNse
HDly
00
b12
b11
Background Power Estimator Ramp Rate
RHDet
Rx Half-Duplex Detection Threshold
00
NEC Full-Duplex Noise Threshold
b10
Half-Duplex Holdover Delay
Rx Suppression Threshold
Path Change Sensitivity
NEC ERLE Threshold
Table 5. Register 2 Bit Definitions
b9
Function
HDly
00
b8
b7
NseRmp
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.
00
b6
b5
RSThd
00
b4
Word
00*
00*
00*
00*
00*
00*
01
10
11
01
10
11
01
10
11
01
10
11
01
10
11
01
10
11
0*
1
PCSen
b3
0
b2
high sensitivity
1
1
low sensitivity
Operation
reserved
reserved
reserved
reserved
reserved
reserved
200 ms
100 ms
150 ms
-42 dB
-54 dB
24 dB
18 dB
30 dB
5 dB
3 dB
6 dB
0.5 s
5 dB
3 dB
6 dB
zero
1 s
2 s
CS6420
b1
0
0
DS205PP2
b0
0
0