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AMBE-3000F™ Vocoder Chip Users Manual
Version 3.4, April, 2014
Dat
a and Configuration Packets
6.5.5 Parity Field (Parity is enabled by default)
When parity fields are enabled the AMBE-3000F™ Vocoder Chip inserts a 2-byte field at the end of all output packets. The
first byte of the parity field is the parity field identifier and is always equal to 0x2f. The second byte of the parity field is the
parity byte. It is obtained by “Exclusive-oring” every byte in the packet, except for the START_BYTE and the
PARITY_BYTE, together. If parity fields are enabled, the AMBE-3000F™ Vocoder Chip checks the parity byte for all
received packets and discards any packet that has an incorrect parity byte. Parity fields can be enabled or disabled (for all
future input and output packets) by sending a PKT_PARITYMODE field in a control packet.
6.6 Control Packet Format (Packet Type 0x00)
A control packet uses the format as shown in either Table 28 General Packet Format WITHOUT Parity Field or Table 29
General Packet Format WITH Parity Field where the PACKET TYPE is equal to 0x00.
Co
ntrol packets can be used to configure the chip prior to operation and also to query for information from the chip. A control
packet must contain one or more control fields. For each control packet received, the AMBE-3000F™ Vocoder Chip sends
back a response packet. The response packet for most fields just echoes back the control field identifier followed by a 0x00
byte to indicate that the control field was received successfully. For control fields that query for information, the response
packet contains the Requested information (1 or more bytes depending upon the control field identifier).
6.6.1 Control Packet Fields and Response Fields
The control packet supports the following packet fields:
Control Packet – Fields
Field Identifier Name
Field Identifier
Code
Control Field
Data Length
(bytes)
Response Field
Data Length
(bytes)
Direction
Description
PKT_CHANNEL0 0x40 none none I/O The subsequent fields are for channel 0
PKT_ECMODE 0x05 2 none I/O Encoder cmode flags for current channel
PKT_DCMODE 0x06 2 none I/O Decoder cmode flags for current channel
PKT_COMPAND 0x32 1
none
I/O
Companding ON/OFF and a-law/µ-law
selection
PKT_RATET 0x09 1 none I/O Select rate from table for current channel
PKT_RATEP 0x0A 12 none I/O Select custom rate for current channel
PKT_INIT 0x0B 1 none I/O
Initialize encoder and/or decoder for current
channel
PKT_LOWPOWER 0x10 1 none I/O Enable or disable low-power mode
PKT_CODECCFG 0x38 varies none I/O Sends configuration packet to codec
PKT_CODECSTART 0x2A 1 none I/O Switches from packet mode to codec mode
PKT_CODECSTOP 0x2B none none I/O Switches from codec mode to packet mode
PKT_CHANFMT 0x15 2 none I/O Sets the format of the output channel packet
PKT_SPCHFMT 0x16 2 none I/O Sets the format of the output speech packet
PKT_PRODID 0x30 none varies I/O Query for product identification
PKT_VERSTRING 0x31 none 48 I/O Query for product version string
PKT_READY 0x39 none none O
Indicates that the device is ready to receive
packets
PKT_HALT 0x35 none none I
Sets AMBE-3000F™ Vocoder Chip into
lowest power mode
(Subject to Change) Page 61
DVSI CONFIDENTIAL PROPRIETARY
- 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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