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AMBE-3000F™ Vocoder Chip Users Manual
Version 3.4, April, 2014
Dat
a and Configuration Packets
t
hresholds may need to be set to higher values if the device connected to RTSn does not stop sending packet data quickly
enough after RTSn goes high.
The RTSn signal follows the conventions commonly used for RS-232 flow control. If the MCBSP or the parallel port is
selected for the packet interface, rather than the UART, then the RTSn signal is still generated. The RTSn signal can also be
used for flow control if the McBSP or the PPT interface is used.
Format of the PKT_RTSTHRESH field is as follows. 5 bytes total. 1 byte code is 0x4e followed by 2 bytes for thresh_hi two
bytes for thresh_lo
PKT_RTSTHRESH Response field (2 bytes) this field indicates that the PKT_ RTSTHRESH field in the corresponding
control packet was received without error.
PKT_RTSTHRESH Response Field - Format
Field Identifier Response Field Data
1 Byte 1 Byte
0x4E
0x00
(anything different indicates error)
Table 95 PKT_RTSTHRESH Response Field
Note: “PKT_GAIN” and “PKT_GAIN Response” are ONLY effective for 16 bit
Linear Samples when in Packet Mode
PKT_GAIN field (3 bytes total) This field can be used to set the input gain and output gain to anywhere between +90 and -90
dB. The default input gain and output gain are each 0 dB.
PKT_GAIN Field - Format
Control Fields Data
Field Identifier
Input Gain Output Gain
1 Byte 1 Byte 1 Byte
0x4B
Table 96 PKT_GAIN Field Format
If the input gain is < 0 dB then the input speech samples are attenuated prior to encoding.
If the input gain is > 0 dB then the input speech samples are amplified prior to encoding.
If the output gain is < 0 dB then the output speech samples are attenuated after decoding.
If the output gain is > 0 dB then the output speech samples are amplified after decoding.
It is recommended that the input and output gain are both 0 dB. Different values can be used for testing purposes.
PKT_GAIN Response field (2 bytes total) this field indicates that the PKT_GAIN field in the corresponding control packet
was received without error.
PKT_GAIN Response Field - Format
Field Identifier Response Field Data
1 Byte 1 Byte
0x4B
0x00
(anything different indicates error)
Table 97 PKT_GAIN Response Field
(Subject to Change) Page 78
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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