CDB6420 Просмотр технического описания (PDF) - Cirrus Logic
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CDB6420 Datasheet PDF : 52 Pages
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CS6420
Register 2
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
NErle
00
NFNse
00
RHDet
00
HDly
00
NseRmp
00
RSThd PCSen 1 0 0
00
0
100
Bits
15-14
Name
NErle
Function
NEC ERLE Threshold
13-12
NFNse
NEC Full-Duplex Noise Threshold
11-10
RHDet
Rx Half-Duplex Detection Threshold
9-8
HDly
Half-Duplex Holdover Delay
7-6
NseRmp Background Power Estimator Ramp Rate
5-4
RSThd
3
PCSen
Rx Suppression Threshold
Path Change Sensitivity
Word
00*
01
10
11
00*
01
10
11
00*
01
10
11
00*
01
10
11
00*
01
10
11
00*
01
10
11
0*
1
Operation
24 dB
18 dB
30 dB
reserved
zero
-42 dB
-54 dB
reserved
5 dB
3 dB
6 dB
reserved
200 ms
100 ms
150 ms
reserved
1s
0.5 s
2s
reserved
5 dB
3 dB
6 dB
reserved
high sensitivity
low sensitivity
* 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.
16
DS205PP2
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