CDB6420 Cirrus Logic Inc, CDB6420 Datasheet - Page 16

• Manufacturer Part Number: CDB6420
• Description: Development Kit
• Manufacturer: Cirrus Logic Inc

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