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AMBE-3000™ Vocoder Chip Users Manual
Version 2.8, August, 2011
(Subject to Change) Page 32
DVSI CONFIDENTIAL PROPRIETARY
I/O Management
Digital Voice Systems, Inc.
The Speech Compression Specialists
5 I/O Management
The AMBE-3000™ Vocoder Chip offers a variety of interfaces that can be configured in a variety of ways. Selection of the
physical interface and the operating Mode is determined from the configuration pins after reset. The AMBE-3000™ Vocoder
Chip uses an I/O Handler to manage data to/from the encoder/decoder according to the selected interfaces and operating mode.
The I/O handler is also used to schedule calls to the encoder and decoder.
The I/O handler passes 160±4 Codec samples to the encoder for each 20 ms frame. In addition to passing the speech samples
to the encoder for every 20 ms frame, the I/O Handler passes a 16-bit control word named ECMODE_IN to the encoder.
ECMODE_IN is used to control various encoder features. Features set by ECMODE_IN will override the state as set by the
corresponding hardware configuration pins. Each bit of ECMODE_IN is summarized in Table 13 ECMODE_IN Flags:
Bit
Number
Bit Name Bit Description Initial Value
0 (LSB) Reserved.0 Reserved 0 at reset
1 Reserved.1 Reserved 0 at reset
2 Reserved.2 Reserved 0 at reset
3 Reserved.3 Reserved 0 at reset
4 Reserved.4 Reserved 0 at reset
5 Reserved.5 Reserved 0 at reset
6 NS_ENABLE
Noise Suppressor Enable. If this bit is set the noise
suppressor is enabled, otherwise the noise suppressor is
disabled.
After reset, this bit is
initialized using the setting
from the NS_ENABLE pin.
7 CP_SELECT
Compand Select.
If companding is enabled and CP_SELECT=0, then µ-
law companding is selected. If companding is enabled,
and CP_SELECT=1 then a-law companding is selected.
If companding is not enabled, then this bit has no effect.
After reset, this bit is
initialized using the setting
from the CP_SELECT pin.
8 CP_ENABLE
Compand Enable
If CP_ENABLE=1, then companding is enabled (either
a-law or u-law, depending on the setting of
CP_SELECT). If CP_ENABLE=0, then companding is
disabled and all speech samples are 16-bit linear.
After reset, this bit is
initialized using the setting
from the CP_ENABLE pin.
9 ES_ENABLE
Echo suppressor Enable.
If ES_ENABLE=1, the echo suppressor is enabled,
otherwise the echo suppressor is disabled.
After reset, this bit is
initialized using the setting
from the ES_ENABLE pin.
10 Reserved.10 Reserved 0 at reset
11 DTX_ENABLE
Discontinuous Transmission Enable.
If DTX_ENABLE=1, then the encoder outputs a special
silence frame whenever silence is detected. If
DTX_ENABLE=0, then the encoder does not output
special silence frames when silence is detected.
After reset, this bit is
initialized using the setting
from the DTX_ENABLE pin.
12 TD_ENABLE
Tone Detect Enable.
If TD_ENABLE=1, then tone detection is enabled,
otherwise tone detection is disabled.
This bit is initialized to 1 (tone
detection enabled) at reset.
13 EC_ENABLE
Echo Canceller Enable.
If EC_ENABLE=1, then the echo canceller is enabled,
otherwise the echo canceller is disabled.
After reset, this bit is
initialized using the setting
from the EC_ENABLE pin.
14 TS_ENABLE
Tone Send Enable.
If TS_ENABLE=1, then the encoder produces a tone
frame in place of the frame that it would normally
produce.
This bit is initialized to 0 at
reset.
- AMBE-3000™ 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 25
- 2.7.1 External Clock Source 28
- 2.7.2 Crystal Oscillator 29
- Digital Voice Systems, Inc 30
- Table 7 Voltage Supply Pins 31
- 3.7 Power-Down Sequencing: 32
- 3.8 Low Power Modes 33
- 3.8.1 Run State 34
- 3.8.2 Idle State 34
- 3.8.3 Standby State 34
- 3.8.4 Halt State 34
- 3.8.5 Power Modes 34
- Figure 13 Power Modes 35
- 4.2 Interface Selection 37
- Figure 15 Typical Echo Path 39
- Table 11 Companding Control 41
- 5 I/O Management 42
- Table 13 ECMODE_IN Flags 43
- Table 14 ECMODE_OUT FLAGS 43
- Table 15 DCMODE_IN Flags 44
- Table 16 DCMODE_OUT Flags 44
- 5.1 Operating Modes 45
- 5.1.3 Packet Mode 47
- Figure 20 Packet Mode 49
- 5.2 SPI Interface 50
- 5.3 UART Interface 51
- 5.4 McBSP Interface 52
- 5.5 Parallel Interface 55
- Table 26 PPT Timing 56
- Figure 27 Vocoder Front End 57
- Diagram 59
- 6.1 Overview 61
- 6.2 Codec Mode Operation 61
- 6.3 Packet Mode Operation 61
- 6.4 Packet Interfaces 62
- 6.5 Packet Format 62
- 6.5.3 TYPE (1 byte) 63
- 6.5.4 Packet Fields 63
- Table 59 PKT_CODECSTOP Field 71
- Table 61 PKT_CHANFMT Field 71
- samples dcmode 72
- Table 71 PKT_READY Field 74
- Table 72 PKT_HALT Field 74
- Table 73 PKT_RESET Field 74
- 6.7.1 Speech Packet Fields 81
- Table 100 CMODE Field Format 82
- Table 103 TONE Field Format 82
- 6.11 Example Packets 86
- 7 Appendices 90
- Table 115 Rate Index Numbers 92
- 8 Support 95
- 10 IC Chip Software Errata 99
- Release 007 09/10/2009 100
- 11 History of Revisions 101
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