AMBE-2000™ Vocoder Chip Users Manual
Version 4.92, June, 08
DVSI Confidential Proprietary, Subject to Change
Page 14
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3.2
Pin Descriptions
Pin Number
Pin Descriptive Name
Pin Direction
Notes
77
CHAN_SEL1
Input
Channel Interface Selection Pins: Use these bits to select the channel interface type
(framed, unframed active, passive) according to Table 4-A. See full description in section
4.2.
75
CHAN_SEL0
Input
Used with CHAN_SEL1 to select channel operation mode
85
CODEC_SEL1
Input
84
CODEC_SEL0
Input
A/D-D/A Select Pins see Table 6-A to select the interface.
74
RATE_SEL4
Input
73
RATE_SEL3
Input
72
RATE_SEL2
Input
71
RATE_SEL1
Input
70
RATE_SEL0
Input
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.
86
VAD_EN
Input
Voice Activity Detection Enable Pin. Active HIGH. See Section 7.3. VAD is controlled
ON/OFF using the Control Word interface as described in section 5.2.9.
24
ENCODER_EN
Input
Encoder/Decoder switch. Switch on to enable Encoder and disable Decoder (must be used
in conjunction with Encoder Enable function in Framed Input. See Section 5.2.9). Switch
off to enable Decoder and disable Encoder.
83
SLEEP_EN
Input
Standard Sleep Enable Pin. Active HIGH. See Section 7.5.1.
82
SLIP_EN
Input
Slip Control Enable Pin. Active HIGH. See Section 7.6.
68
X2/CLKIN
Input
Clock Input 1. 16.384 MHz input. See Section 3.3
67
X1
Input
Output from internal oscillator for the crystal. If the internal oscillator is not used this pin
should be unconnected.
69
RESETN
Input
AMBE-2020™ Reset pin. Active LOW. See Section 3.3
20
EPR
Output
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.
79
SOFT_EN
Input
Soft decision decoding enable. When high it enables 4 bit soft decision error decoder.
Keep low when not in use.
80
BAUD_SEL0
Input
81
BAUD_SEL1
Input
Baud Rate Selector for unframed serial mode See Table 4-B.
32
CHAN_RX_DATA
Input
Channel Receive Data to AMBE-2020™
42
CHAN_TX_DATA
Output
Channel Transmit Data from AMBE-2020™
28
CHAN_RX_CLK
Input
Channel Receive Clock
34
CHAN_TX_CLK
Input
Channel Transmit Clock
38
CHAN_TX_STRB
I/O
Channel Transmit Data Strobe
30
CHAN_RX_STRB
Input
Channel Receive Data Strobe
29
CODEC_RX_STRB
Input
Frame synchronization pulse for A/D data. Should be connected to CODEC_TX_STRB
37
CODEC_TX_STRB
Input
Frame synchronization pulse for D/A data. Should be connected to CODEC_RX_STRB
31
CODEC_RX_DATA
Input
PCM Data from A/D Converter to AMBE-2020™
