AMBE-2000 Digital Voice Systems, Inc., AMBE-2000 Datasheet - Page 13

• 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.

3.2
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Pin Number
77
75
85
84
74
73
72
71
70
86
78
83
82
68
67
69
20
79
80
81
32
42
28
34
38
30
29
37
31
Pin Descriptions
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Pin Descriptive Name
CODEC_RX_DATA
CODEC_RX_STRB
CODEC_TX_STRB
CHAN_RX_DATA
CHAN_TX_DATA
CHAN_TX_STRB
CHAN_RX_STRB
CHAN_RX_CLK
CHAN_TX_CLK
ECHOCAN_EN
CODEC_SEL1
CODEC_SEL0
CHAN_SEL1
CHAN_SEL0
BAUD_SEL0
BAUD_SEL1
RATE_SEL4
RATE_SEL3
RATE_SEL2
RATE_SEL1
RATE_SEL0
SLEEP_EN
X2/CLKIN
SOFT_EN
VAD_EN
SLIP_EN
RESETN
EPR
X1
Pin Direction
Output
Output
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
I/O
AMBE-2000™ Vocoder Chip
User’s Manual Version 4.0
Channel Interface Selection Pins: Use these bits to select the channel interface type
Used with CHAN_SEL1 to select channel operation mode
Slip Control Enable Pin. Active HIGH. See Section 7.7.
AMBE-2000™ Reset pin. Active LOW. See Section 3.3
Frame synchronization pulse for D/A data. Should be connected to CODEC_RX_STRB
Notes
(framed, unframed, active and passive) according to Table 4-A. See full description in
section 4.2.
A/D-D/A Select Pins see Table 6-A to select the interface.
Coding Rate Select Pins: Use these bits to select the voice and FEC rates according to
section 7.2. The coding rates are also selectable using the Control Word interface
described in section 5.2.4.
Voice Activation Detection Enable Pin. Active HIGH. See Section 7.4. VAD can also be
enabled/disabled using the Control Word interface as described in section 5.2.9.
Echo Canceller Enable Pin. Active HIGH. See Section 7.3. The Echo Canceller can also
be enabled/disabled using the Control Word interface as described in section 5.2.9.
Standard Sleep Enable Pin. Active HIGH. See Section 7.6.1.
Clock Input 1. 16.384 Mhz input. See Section 3.3
Output from internal oscillator for the crystal. If the internal oscillator is not used this pin
should be unconnected.
Encode Packet Ready: Following a reset, this signal will have a high to low transition to
indicate the first packet is ready. The next packet will be ready approximately 20 msec
later. See Note 1.
Soft decision decoding enable. Enables 4 bit soft decision error decoder.
Baud Rate Selector for unframed serial mode See Table 4-B.
Channel Receive Data to AMBE-2000™
Channel Transmit Data from AMBE-2000™
Channel Receive Clock
Channel Transmit Clock
Channel Transmit Data Strobe
Channel Receive Data Strobe
Frame synchronization pulse for A/D data. Should be connected to CODEC_TX_STRB
PCM Data from A/D Converter to AMBE-2000™
Page 13