AMBE2000 ETC, AMBE2000 Datasheet - Page 12

• Manufacturer Part Number: AMBE2000
• Description: VOCODER CHIP
• Manufacturer: ETC

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).
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.
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
36,39,44,45
49,54,57,64
35,40,50,52
53,56,63,65
Pin Number
8,11,12,23
46, 47,48
76,87,90
88,89
41
27
33
51
CODEC_TX_DATA
Pin Descriptive Name
CODEC_RX_CLK
CODEC_TX_CLK
CLOCK_MODE
No Connection
GND
V
DD
Pin Direction
Confidential Proprietary, Subject to Change
Output
Power
Power
Input
Input
Input
User’s Manual Version 3.0
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Notes
PCM Data from AMBE-2000 to D/A Conveter
A/D Serial clock. Should be connected to CODEC_TX_CLK
D/A Serial clock Should be connected to CODEC_RX_CLK
If high enables crystal oscillator option for clock source. If low then external oscillator
option is selected. See Section 3.4 for details.
Supply Voltage
Ground
These pins must remain unconnected
page 12
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