AMBE2000 datasheet(12/47 Pages) ETC

12 / 47 page

AMBE-2000™ Vocoder Chip

User’s Manual Version 3.0

page 12

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Confidential Proprietary, Subject to Change

Pin Number

Pin Descriptive Name

Pin Direction

Notes

CODEC_TX_DATA

Output

PCM Data from AMBE-2000 to D/A Conveter

CODEC_RX_CLK

Input

A/D Serial clock. Should be connected to CODEC_TX_CLK

CODEC_TX_CLK

Input

D/A Serial clock Should be connected to CODEC_RX_CLK

CLOCK_MODE

Input

If high enables crystal oscillator option for clock source. If low then external oscillator

option is selected. See Section 3.4 for details.

8,11,12,23

36,39,44,45

46, 47,48

49,54,57,64

76,87,90

VDD

Power

Supply Voltage

1,9,10,25,26

35,40,50,52

53,56,63,65

88,89

GND

Power

Ground

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

No Connection

These pins must remain unconnected

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.

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