Digital Voice Systems AMBE-2000, AMBE-2020 Supplementary Manual

234 Littleton Road Tel: [phone] email: [e-mail]

Digital Voice Systems, Inc.

The Speech Compression Specialists

Westford, MA 01886 USA Fax: [phone] www.dvsinc.com

Using DVSI’s AMBE-2000™ and AMBE-2020™ Vocoder Chips with the

Texas Instruments’ TLV320AIC10 General Purpose CODEC

The Texas Instruments’ TLV320AIC10 codec presents a simple low cost solution for use with
DVSI’s AMBE-2000™ or AMBE-2020™ vocoder chips. This application note provides
information on interfacing these components. Figure 1 shows a sample block diagram interface,
between the TLV320AIC10 codec and DVSI’s AMBE-2000™ vocoder chip.

U1

CODEC_RX_DATA

CODEC_TX_DATA

CODEC_TX_CLK

CODEC_RX_CLK

CODEC_RX_STRB

CODEC_TX_STRB

AMBE-2000

31

41

33

27

29

37

VDD

VDD

VOICE_*RESET

16.384 MHz

16

17

19

20

21

22

23

24

25

26

27

10

11

12

13

U27

DOUT

DIN

SCLK

MCLK

FSD

FS

FLAG

FC

DCSI

ALTIN

M/*S

M0

M1

*PWRDWN

*RESET

29

VDD

DVSS

15

DVDD1

14

30

DVDD2

DVSS

AVDD

45

34

AVDD1

AVSS

AVSS

334042

AVDD2

AVSS

AVSS

46

AURXCP

AURXM

AURXFP

INM

INP

OUTM

OUTP

VMID

FILT

DTXIM

DTXIP

DTXOM

DTXOP

TLV320AIC10

3

2

1

48

47

9

8

43

38

7

6

5

4

CODEC Configuration

SERIAL
DATA

*SEE DETAIL
BELOW

SCLK

Figure 1: AMBE-2000™ and TLV320AIC10 sample block diagram

Configuration:

To configure the AMBE-2000™ for operation with the TLV320AIC10, set the CODEC_SEL
pins on the AMBE-2000™ vocoder chip to work with a generic 16 bit linear 8 kHz codec as
follows:

Interfacing AMBE-2000™ and AMBE-2020™ Vocoder Chips with TI’s TLV320AIC10 CODEC Rev 1 Oct ‘02

CODEC_SEL [1-0] (pins 85,84) = 00b

page 1 of 4

Initialization Procedure:

The control registers in the TLV320AIC10 codec must be initialized for proper operation.
The recommended procedure is to initialize the TLV320AIC10 by writing data to its 4 control
registers through the DCSI port, while the AMBE-2000™ is held in reset. The timing for the
DCSI port is shown in Figure 2.

Note that the Device Address (D14-D12) is normally set to 0 unless multiple codec devices
are used in cascade. Be sure that the stop bit is at least 2 clock pulses long between data
words as shown in the timing diagram. Shift the control words into the device 1 bit at a time
at the rate of SCLK.

Various configuration data can be used to control the operation of the TLV320AIC10 codec
(see the data sheet for more information), however for reference the AMBE-2000™ has
been tested with the TLV320AIC10 configured using the register values shown in Table 1.
Once the TLV320AIC10 is configured, the AMBE-2000™ should be taken out of reset to
begin communication with the codec.

The logic connected to the DCSI port does not have to be disabled. The user can make
adjustments to the configuration as needed (for example ADC and DAC gain). A reset to
the TLV320AIC10 codec will reset all of the internal registers. As a result, the TLV320AIC10
must be reconfigured following a reset.

Figure 2: TLV320AIC10 configuration timing via DCSI port

Interfacing AMBE-2000™ and AMBE-2020™ Vocoder Chips with TI’s TLV320AIC10 CODEC Rev 1 Oct ‘02

page 2 of 4