AMBE-2000 Digital Voice Systems, Inc., AMBE-2000 Datasheet - Page 14

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AMBE-2000

Manufacturer Part Number
AMBE-2000
Description
2.0 - 9.6 KBPS Single ic For Toll-quality, Low Data Rate, Real Time Speech Compression
Manufacturer
Digital Voice Systems, Inc.
Datasheet

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Note 1:The AMBE-2000™ expects an encoder packet to be read approximately every 20 msec. Following the
initial reset, wait for EPR to go low and read the initial packet (t0). 20 msec later, the next packet (t1) should be
ready. For packet t1 and all following packets use the procedure below:
1) Wait for slightly less than 20 msec.
2) Assert CHAN_TX_STB and read word on CHAN_TX_DATA.
3) If transmitted word not 0x13EC, discard it and repeat step 2.
4) If transmitted word 0x13EC, read 23 more words (rest of packet).
The EPR signal should not be used as an interrupt. The EPR is only valid for the first high to low transition.
A new packet should be ready every 20 msec after the initial EPR high to low transition. A packet read should take
place every 20 msec. If there is a delay in the read (i.e. a packet is missed), it is recommended that the device be
reset.
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2,3,4,5,6,7,
13,14,15,16
17,18,19,21
22,24,43,55
58,59,60,61
62,66,91,92
93,94,95,96
97,98,99
100
1,9,10,25,26
Pin Number
36,39,44,45
49,54,57,64
35,40,50,52
53,56,63,65
8,11,12,23
46, 47,48
76,87,90
88,89
41
27
33
51
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CODEC_TX_DATA
Pin Descriptive Name
CODEC_RX_CLK
CODEC_TX_CLK
CLOCK_MODE
No Connection
GND
V
DD
Pin Direction
Output
Power
Power
Input
Input
Input
AMBE-2000™ Vocoder Chip
User’s Manual Version 4.0
A/D Serial clock. Should be connected to CODEC_TX_CLK
D/A Serial clock Should be connected to CODEC_RX_CLK
Notes
PCM Data from AMBE-2000™ to D/A Converter
If high enables crystal oscillator option for clock source. If low then external oscillator
option is selected. See Section 3.5 for details.
Supply Voltage
Ground
These pins must remain unconnected
Page 14

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