CDB6422 Cirrus Logic Inc, CDB6422 Datasheet - Page 8

• Manufacturer Part Number: CDB6422
• Description: Development Kit
• Manufacturer: Cirrus Logic Inc

Specifications of CDB6422

• Silicon Manufacturer: Cirrus Logic
• Application Sub Type: Telephone
• Kit Application Type: Communication & Networking
• Silicon Core Number: CS6422
• Description/function: Audio DSPs
• Operating Supply Voltage: 5 V to 12 V
• Product: Audio Modules
• Kit Contents: Evaluation Board
• Rohs Compliant: No
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: CS6422

The KEYPAD and status LEDs return to their nor-
mal states after the Configuration number has been
selected.
Because the Configuration sets are stored in EE-
PROM, they will survive a power-off event. How-
ever, Configuration 0 is special for two reasons: 1)
it is reset to the CS6422 default register state on
power-up or on microcontroller reset, and 2) it is
automatically downloaded to the CS6422 when the
“6422_RST” pushbutton is pressed (or the 'r' com-
mand is sent from a terminal).
Thus, if you wish to test a RESET configuration
state and you will be testing the board from power-
off (for example, if you set up your configuration
registers in the lab and want to perform testing in a
car), you must store the configuration to be tested
in Configuration space (1..9). Once the board has
been powered for testing in the target environment
(the car), you can RECALL the saved configura-
tion and STORE it in Configuration 0. Pressing the
“6422_RST” button will reset the CS6422 and
download the Configuration 0 information to the
device for testing.
2.6.6
Pressing the "VOL_DOWN" pushbutton decreases
the receive (speaker) volume by 3dB per button
press until RVol = 'mute'. The current receive vol-
ume is reflected in the status LED bar with the fol-
lowing mapping:
8
# LEDs on
“VOL_DOWN” PUSHBUTTON:
0
1
2
3
4
5
6
7
8
+15 to +18 dB (default)
+30 dB (maximum)
+9 to +12 dB
+3 to +6 dB
RVol Value
-12 to 0 dB
+21 dB
+24 dB
+27 dB
mute
2.6.7
Pressing the "VOL_UP" pushbutton increases the re-
ceive (speaker) volume by 3dB per button press until
RVol = '+30dB'. The receive volume is reflected in
the status LED bar with the mapping described in the
“VOL_DOWN” Pushbutton description.
3. COMMAND SERIAL PORT
The CDB6422 can operate connected to a PC or in a
stand-alone configuration. If connected to a PC, the
board can be controlled by supplied Windows-based
software or through a simple terminal program. The
board communicates at 19.2kbps, 8 data bits, 1 stop
bit, and no parity or handshaking of any kind. All
commands and responses are standard ASCII text
with no special characters or binary data.
This section describes the commands and response
primitives that the board accepts and provides
through the serial connection. This can be thought
of as a "command list" for "terminal" mode.
3.1
The following is a listing of commands and messag-
es that the CDB6422 (Rev. A) evaluation board ac-
cepts and transmits through the serial connection.
DESCRIPTION
Command List:
vol_down
“VOL_UP” PUSHBUTTON:
on_hook
unmute
recall
mwr
swd
swp
wrb
doff
ver
ext
kd
pu
st
?
r
off_hook
d_reset
vol_up
CDB6422
reset
mute
save
dtmf
swu
ring
wr
ku
pd
uc
rd
d
DS295DB2