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AMBE-3000F™ Vocoder Chip Users Manual
Version 3.4, April, 2014
I/
O Management
At ti
me 1 controller sets PPT_READ (PPT_WRITE) low to request to read (write) from the PPT interface.
At time 2 the AMBE-3000F™ Vocoder Chip sets the PPT_ACK low and the PPT_DATA is valid.
At time 3 the controller has read (written) the data and now sets the PPT_READ (PPT_WRITE) high.
At time 4 the AMBE-3000F™ Vocoder Chip sets the PPT_ACK high after the PPT_READ (PPT_WRITE) goes back to high.
For Example: If the designed system uses t
b
< 0.5µs the parallel port can transfer data, at rates exceeding 4.1 Mbps.
5.9 Codec A/D / D/A Interface
The AMBE-3000F™ Vocoder Chip operates with a speech data sample rate of 8kHz for both the A/D and D/A interfaces.
This 8kHz data is input and output using a serial port on the AMBE-3000F™ Vocoder Chip. The user can choose between
hardware configuration pins or software control in order to the process of configuring the interface to the A/D-D/A chip.
5.10 Vocoder Front End Requirements
In order to ensure proper performance from the voice coder, it is necessary for the vocoder front end to meet a set of minimum
performance requirements. For the purposes of this section the vocoder front end is considered to be the total combined
response between microphone/speaker and the digital PCM interface to the vocoder, as shown in Figure 35 Typical Vocoder
Im
plementation. This includes any analog electronics plus the A-to-D and D-t
o-A converters as well as any digital filtering
performed prior to the voice encoder or after the voice decoder.
Figure 35 Typical Vocoder Implementation
The AMBE+™ voice encoder and decoder operate with unity (i.e. 0 dB) gain. Consequently the analog input and output gain
elements shown in Figure 36 Vocoder Front End are only used to match the sensitivity of the microphone and speaker with the
A-t
o-D converters and D-to-A converters, respectively.
(Subject to Change) Page 53
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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