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AMBE-3000F™ Vocoder Chip Users Manual
Version 3.4, April, 2014
(Subject to Change) Page 58
DVSI CONFIDENTIAL PROPRIETARY
Data and Configuration Packets
Digital Voice Systems, Inc.
The Speech Compression Specialists
6 Data and Configuration Packets
6.1 Overview
Interfacing to the AMBE-3000F™ Vocoder Chip is engineered to provide as much flexibility as possible. The AMBE-
3000F™ Vocoder Chip always uses a packet format for the compressed voice data bits and for the chip configuration/control.
The packets can be transferred using the UART port, parallel port or McBSP serial port for a physical interface based on the
setting of hardware configuration pins. Packets are designed such that they can be as small as possible.
The AMBE-3000F™ Vocoder Chip uses packets whether it is running in codec mode or packet mode. When in codec mode
the packets are used for communicating with the AMBE-3000F™ Vocoder Chip to configure the vocoder, poll vocoder status
information, as well as, transferring compressed voice bits from the encoder or to the decoder. When running in packet mode
the packets provide the same capabilities as codec mode plus they have the ability to transfer speech data samples to the
encoder or from the decoder.
Every packet includes a HEADER that consists of a START byte for identification of the beginning of the packet, LENGTH
data to indicate how many bytes are in the packet and a TYPE byte that specifies what to do with the packet. Packets are
processed in a first-in-first-out manner.
6.2 Codec Mode Operation
When the AMBE-3000F™ Vocoder Chip is in codec mode the chip uses separate interfaces for the digitized speech data
samples and the compressed data bits. In this mode the AMBE-3000F™ Vocoder Chip automatically sends out compressed
data bits (channel data) packets every 20ms and expects to receive compressed data bits (channel data) packets every 20ms.
The timing of the data transfer depends on the codec clock.
6.3 Packet Mode Operation
In packet mode the AMBE-3000F™ Vocoder Chip uses the same interface for the digitized speech data samples and the
compressed data bits. In this mode, when the AMBE-3000F™ Vocoder Chip receives packets, it processes the packets and
sends response packets as soon as the data is ready. The AMBE-3000F™ Vocoder Chip sends response packets in the same
order that the packets are received. The AMBE-3000F™ Vocoder Chip maintains a FIFO for received packets and a separate
FIFO for packets that are awaiting transmission. The FIFOs are each large enough to accommodate up to two speech packets
and two channel packets. The AMBE-3000F™ Vocoder Chip can continue to transmit/receive packets while it is still
processing prior packets.
When the AMBE-3000F™ Vocoder Chip receives a speech packet, it takes the speech samples from the packet, encodes them
and sends back a channel packet.
When the AMBE-3000F™ Vocoder Chip receives a channel packet, it takes the channel data from the packet, decodes the
channel data, and sends back a speech packet.
When the AMBE-3000F™ Vocoder Chip receives a configuration control packet, it makes the requested configuration changes
and sends back a configuration response packet.
- AMBE-3000F™ Vocoder Chip 1
- DVSI Confidential Proprietary 1
- (Subject to Change) Page v 5
- (Subject to Change) Page x 10
- 1 Product Introduction 11
- 1.3 Typical Applications 12
- 2 Hardware Information 13
- 2.2 Package Details 14
- (Subject to Change) Page 5 15
- 2.3 Pin Assignment Layouts 16
- A B C D E F G H J K L M N P 17
- (Subject to Change) Page 8 18
- (Subject to Change) Page 9 19
- 2.5 Pin Out Table 20
- PARITY_ENABLE 79 22
- Input Enable parity bit 22
- Table 1 Pinout List 26
- 2.7.1 External Clock Source 29
- 2.7.2 Crystal Oscillator 29
- Table 7 Voltage Supply Pins 32
- 3.6 Reset Behavior 33
- Figure 11 TX_RDY after Reset 34
- Figure 12 Output Levels 34
- 3.8 Power-Down Sequencing: 35
- 3.9 Low Power Modes 35
- 3.9.1 Run State 36
- 3.9.2 Idle State 36
- 3.9.3 Standby State 36
- 3.9.4 Halt State 36
- 3.9.5 Power Modes 37
- 4.2 Interface Selection 40
- 4.4 Vocoder State 41
- Figure 18 Typical Echo Path 43
- Table 11 Companding Control 44
- 5 I/O Management 45
- Table 13 ECMODE_IN Flags 46
- Table 14 ECMODE_OUT FLAGS 46
- Table 15 DCMODE_IN Flags 47
- Table 16 DCMODE_OUT Flags 47
- 5.2 Codec mode 49
- “0 to Transition”“1” 51
- “Packet_ _Zone”Uncertainty 51
- “aperiodic packets” 52
- 5.3 Packet Mode 53
- Figure 29 Packet Mode 55
- 5.5 SPI Interface 56
- 5.6 UART Interface 57
- 5.7 McBSP Interface 58
- 5.8 Parallel Interface 61
- Table 26 PPT Timing 62
- Figure 36 Vocoder Front End 64
- Diagram 66
- 6.1 Overview 68
- 6.2 Codec Mode Operation 68
- 6.3 Packet Mode Operation 68
- 6.4 Packet Interfaces 69
- 6.5 Packet Format 69
- 6.5.3 TYPE (1 byte) 70
- 6.5.4 Packet Fields 70
- Table 59 PKT_CODECSTOP Field 78
- Table 61 PKT_CHANFMT Field 79
- samples dcmode 80
- Table 64 PKT_SPCHFMT Field 80
- 0x54 0x46 0x00 81
- Table 71 PKT_READY Field 82
- Table 72 PKT_HALT Field 82
- Table 73 PKT_RESET Field 82
- 6.7.1 Speech Packet Fields 89
- Table 100 CMODE Field Format 90
- Table 103 TONE Field Format 90
- 6.11 Example Packets 94
- 7 Appendices 98
- Table 115 Rate Index Numbers 100
- 8 Support 103
- Digital Voice Systems, Inc 104
- 10 IC Chip Software Errata 107
- Release 007 09/10/2009 108
- Release 014 08/31/2012 108
- 11 History of Revisions 109
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