Cirrus Logic CDB6422 - Manual (Page 15)

CDB6422
DS295DB2 15
reg 5: 014a -- NECD = '1', ASdt = '-24dB'
(disable NEC and enable acoustic
sidetone)
Note: if the cellular phone provides a net-
work sidetone (coupling between NO
and NI), then Taps should be set to
‘39.5ms/24ms’, and NECD should be
set to ‘0’.
To configure the CS6422 with the above:
1) press and release the "6422_RST" pushbutton
2) press and release the "LOAD" pushbutton
(once)
3) press '9' '4' '0' '0' on the keypad
4) press and release the "Load" pushbutton (once)
5) press '0' 'a' '0' '2' on the keypad
6) press and release the "LOAD" pushbutton
(once)
7) press '2' '0' '0' '6' on the keypad
8) press and release the "LOAD" pushbutton
(once)
9) press '0' '1' '4' 'a' on the keypad
At this point, the CS6422 is loaded with the correct
configuration. To save this configuration in Con-
figuration set #2:
1) press and release the "LOAD" pushbutton (3)
times
2) press '2' on the keypad
To recall a configuration:
1) press and release the "LOAD" pushbutton (2)
times
2) press the number on the keypad corresponding
to the Configuration set to recall.
To make a call:
1) initiate or answer a call from the cell phone
2) when the far-end talker answers, begin speak-
ing in turns
3) after the echo canceller has trained properly,
the system will move to full-duplex on its own
4) full-duplex operation can be verified by a dou-
ble-talk test in which both parties speak at the
same time
5) if the far-end talker does not hear the near-end
talker during far-end speech, then the CS6422
is in half-duplex mode. Continue speaking in
turns until the device switches to full-duplex
mode.
4.6 Usage Scenario #3: Cellular Call
Through Digital Network Interface
In this scenario, NIN4 is set to “CODEC” to select
the CODEC as the network input source. The cel-
lular phone is connected to the PCM header, and
the optional inversion jumpers on HDR27 are con-
figured for the proper polarity. The Network Echo
Canceller (NEC) is disabled because there is no
coupling between the NO pin on the CS6422 and
the NI pin.
The CS6422 is configured from default settings
with the following:
reg 0: 9400 -- GB = '0.75dB/ms'
reg 1: 0a02 -- Taps = '55.5ms'
reg 3: 2006 -- PCSen = 'low'
reg 5: 014a -- NECD = '1', ASdt = '-24dB'
(disable NEC and enable acoustic
sidetone)
To configure the CS6422 with the above:
1) press and release the "6422_RST" pushbutton
2) press and release the "LOAD" pushbutton
(once)
3) press '9' '4' '0' '0' on the keypad
4) press and release the "Load" pushbutton (once)
5) press '0' 'a' '0' '2' on the keypad
6) press and release the "LOAD" pushbutton
(once)