Digital Voice Systems AMBE-3000 Specifications Page 22
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AMBE-3000F™ Vocoder Chip Users Manual
Version 3.4, April, 2014
H
ardware Information
R
TSn 64 N12 Output
The Request-To-Send (RTSn) pin is an output that is active low.
The signal is used by the AMBE-3000F™ Vocoder Chip to control
the flow of input packet data. The Chip has a receive buffer where
incoming packets are stored until they have been processed. The
AMBE-3000F™ Vocoder Chip sets RTSn low to indicate that it is
ready to receive data. When RTSn is high, the Chip is not ready to
receive packet data.
RTSn is set high if there are less than thresh_hi bytes of free space
in the receive buffer. RTSn is set low if there are more than
thresh_lo bytes of free space in the receive buffer. After a reset
thresh_hi is set to 20 and thresh_lo is set to 40, by default. These
thresholds can be changed by sending a PKT_RTSTHRESH field
as part of a control packet after reset. The thresholds may need to
be set to higher values if the device connected to RTSn does not
stop sending packet data quick 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.
TX_RQST 68 M12 Input
Channel Transmit Data Strobe TX_RQST is used to control the
encoder timing, when skew control is enabled. It must be high for
at least 250 us. The period must be 20+/-1 ms. When skew
control is enabled the time between rising edges of TX_RQST is
used to determine the number of speech samples per frame.
TX_RDY 69 M14 Output
Transmit Packet Ready goes high as soon as the AMBE-3000F™
Vocoder Chip is ready to transmit a channel packet. Goes low
after the entire packet is read. Regardless of the packet interface
selected, whenever the AMBE-3000F™ Vocoder Chip has a
packet ready for transmission it sets TX_RDY to high.
I
2
C_DATA 70 L12 Output I
2
C_DATA (output from AMBE-3000F™ Vocoder Chip to codec)
I
2
C_CLK 71 L13 Output I
2
C_CLK (output from AMBE-3000F™ Vocoder Chip to codec)
STDBY_ENABLEn 75 K14 Input
STDBY_ENABLEn is active low and is only used when low
power mode is Enabled. This signal is required for proper function
of low power mode and must be set low at least 500ns prior to
sending a packet to the AMBE-3000F™ Vocoder Chip. If low
power mode is not enabled then signal can be left unconnected and
not used.
SPI_GENSTE 77 J13 Output
Required when using the SPI interface. This is used to generate
the SPI_STE signal. This pin should be connected to SPI_STE
(pin# 28).
PARITY_ENABLE 79
H11
Input Enable parity bit
SPI_FSn 80 H12 Input
SPI_FSn is active low. If the SPI interface is used SPI_FSn must
be connected to the active low frame sync signal from the codec.
SPI_CLK_IN 86 F13 Input
For SPI Interface to function properly this pin must be connected
to the Serial clock from Codec. (pin #27 SPI_CLK)
(Subject to Change) Page 12
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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