AMBE2000 Datasheet, PDF (11/47 Pages) List of Unclassifed Manufacturers – VOCODER CHIP

AMBE-2000™ Vocoder Chip
User’s Manual Version 3.0
3.2 Pin Descriptions
Pin Number Pin Descriptive Name Pin Direction Notes
77
CHANN_SEL1
Input
Channel Interface Selection Pins : Use these bits to select the channel interface type
(formatted,unformatted active, passive) according to Table 4-A. See full description in
section 4.2.
75
CHANN_SEL0
Input
Used with CH_SEL1 to select channel operation mode
85
CODEC_SEL1
Input
A/D-D/A Select Pins see Table 6-A to select the interface.
84
CODEC_SEL0
Input
74
RATE_SEL4
Input
73
RATE_SEL3
Input
Coding Rate Select Pins : Use these bits to select the voice and FEC rates according to
72
RATE_SEL2
Input
section 7.2. The coding rates are also selectable using the Control Word interface
described in section 5.2.4.
71
RATE_SEL1
Input
70
RATE_SEL0
Input
86
VAD_EN
Input
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.
78
ECHOCAN_EN
Input
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.
83
SLEEP_EN
Input
Standard Sleep Enable Pin. Active HIGH. See Section 7.6.1.
82
SLIP_EN
Input
Slip Control Enable Pin. Active HIGH. See Section 7.7.
68
X2/CLKIN
Input
Clock Input 1. 16.384 Mhz input. See Section 3.4
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-2000 Reset pin. Active LOW. See Section 3.3
Encode Packet Ready: Following a reset, this signal will have a high to low transition to
20
EPR
Output
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. Enables 4 bit soft decision error decoder.
80
BAUD_SEL0
Input
Baud Rate Selector for unformatted serial mode See Table TBDL
81
BAUD_SEL1
Input
32
CHAN_RX_DATA
Input
Channel Receive Data to AMBE-2000
42
CHAN_TX_DATA
Output
Channel Transmit Data from AMBE-2000
28
CHAN_RX_CLK
Input
Channel Receive Clock
34
CHAN_TX_CLK
Input
Channel Transmit Clock
38
CHAN_TX_STRB
I/O
Channel Transmit Frame Synchronization Pulse
30
CHAN_RX_STRB
Input
Channel Receive Frame Synchronization Pulse
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 Conveter to AMBE-2000
page 11
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