ETC ISD-T360

Table of Contents
Chapter 1ÑHARDWARE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.1
PIN ASSIGNMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.1.1
1.2
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.2.1
1.2.2
1.2.3
1.2.4
1.2.5
1.2.6
1.3
Pin-Signal Assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Resetting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Clocking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Power-Down Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Power and Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Memory Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
The Codec Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
1.3.1
1.3.2
1.3.3
1.3.4
1.3.5
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Switching Characteristics—Preliminary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Synchronous Timing Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Timing Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-18
1-18
1-20
1-23
1-25
Chapter 2ÑSOFTWARE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.1
SYSTEM OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.1.1
2.1.2
2.1.3
2.1.4
2.1.5
2.1.6
2.1.7
2.2
Microcontroller interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Memory Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
codec interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
ALGORITHM FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
2.3.1
2.3.2
2.3.3
ISD
2-1
2-2
2-2
2-3
2-4
2-4
2-5
PERIPHERALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
2.2.1
2.2.2
2.2.3
2.3
The State Machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Command Execution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Event Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Message Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tone Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Initialization and Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power-Down Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VCD (Voice Compression and Decompression) . . . . . . . . . . . . . . . . . . . . . . . 2-10
DTMF Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Tone and Energy Detection (Call Progress) . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
vii
ISD-T360SB
2.3.4
2.3.5
Full-Duplex Speakerphone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
Speech Synthesis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
2.4
VOICEDSP PROCESSOR COMMANDS—QUICK REFERENCE TABLE . . . . . . . . .2-21
2.5
COMMAND DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-24
Chapter 3ÑSCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . 3-1
3.1
APPLICATION INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Chapter 4ÑPHYSICAL DIMENSIONS . . . . . . . . . . . . . . . . . . . 4-1
viii
Voice Solutions in Silicon™
ISD-T360SB
VoiceDSP™ Digital Speech Processor with
Master/Slave, Full-Duplex Speakerphone, Multiple Flash
—Advance Information—
and ARAM/DRAM Support
Preliminary Information
The VoiceDSP™ product family combines multiple digital signal processing functions on a single
chip for cost-effective solutions in telephony, automotive and consumer applications.
The VoiceDSP processor offers necessary features to modern telephony products, such as:
high-quality, speech record and playback, electrical and acoustic echo cancellation for full-duplex hands-free speakerphone operation.
The ISD-T360SB VoiceDSP can be used in various
applications:
¥
¥
Digital telephony with add-on speech
processing: Digital Telephone Answering
Machines(DTADs); and full-duplex, handsfree speakerphone operation for ISDN,
DECT, Digital Spread Spectrum, and
analog cordless applications; CT0/1 Base
stations.
An add-on chip for corded telephones
featuring DTAD functions and/or fullduplex, hands-free speakerphone
operation.
¥
Stand-alone digital answering machines
with full-duplex, hands-free speakerphone
operation.
¥
Voice memo recording
¥
Automotive applications employing fullduplex speakerphone operations for
hands-free, in-car communications, and
for car status and information
announcements.
Based on ISD’s unique concept which combines
16-bit DSP (Digital Speech Processor) and 16-bit
RISC core technology, the ISD-T360SB is a highperforming chip solution for various applications.
To facilitate incorporating the VoiceDSP processor, it features system support functions such as
an interrupt control unit, codec interface (master, slave), Microwire interface to the system microcontroller, as well as a memory handler for
Flash and DRAM memory devices. Design of
high-end, price optimized systems are possible
with ISD’s VoiceDSP flexible system interfaces
(codec, microcontroller, and memory management support).
The ISD-T360SB processor operates as a peripheral controlled by the system microcontroller via
an enhanced, serial Microwire interface. The system microcontroller typically controls the analog
circuits, buttons and display, as well as activates
functions through commands. The VoiceDSP executes these commands and returns status information to the Microcontroller.
The VoiceDSP software resides in the on-chip
ROM. It includes DSP-based algorithms, system
support functions, and a software interface to
hardware peripherals.
December 1998
ISD · 2045 Hamilton Avenue, San Jose, CA 95125 · TEL: 408/369-2400 · FAX: 408/369-2422 · http://www.isd.com
ISD-T360SB
FEATURES AT A GLANCE
DTAD MANAGEMENT
¥
¥
Highest quality speech recording in PCM
format for music on hold or other OGM
(Out Going Message) recording and IVS
Selectable high-quality speech
compression rate of 5.3 Kbit/s, 9.9 Kbits or
16.8 Kbit/s, plus silence compression with
each rate
CALL AND DEVICE MANAGEMENT
¥
Digital volume control
¥
Least cost routing support (LCR)
¥
Power-down mode
¥
3V to 5V selectable power supply
¥
4.096 MHz operation
¥
DTMF generation and detection
¥
Up to 16 minutes recording on a 4-Mbit
Flash
¥
Telephone line functions, including busy
and dial tone detection
¥
High-quality music compression for music
on hold (16.8 Kbits)
¥
Single tone generation
¥
Programmable message tag for message
categorization, e.g., Mailboxes, InComing
Messages (ICM), OutGoing Messages
(OGM)
¥
DTMF detection during message playback
PERIPHERAL CONTROL
Codec
¥
Message management
¥
Skip forward or backward during message
playback
¥
µ-Law, A-Law, and 16-bit linear codec
input support
¥
Variable speed playback
¥
Selectable master/slave codec interface
¥
Real-time clock: Day of Week, Hours,
Minutes
¥
Supports two in-coming lines in slave mode
without speakerphone for DTAD recording
¥
Multi-lingual speech synthesis using
International Vocabulary Support (IVS)
¥
Supports up to 16 user selectable speech
channels in slave mode
¥
Vocabularies available in: English,
Japanese, Mandarin, German, French
and Spanish
¥
Supports long-frame and short-frame
codecs
¥
Single/double bit clock rate for slave
mode
¥
On-chip codec clock generation
¥
Software Automatic Gain Control (AGC)
SPEAKERPHONE
¥
Digital full-duplex speakerphone
¥
Acoustic- and line-echo cancellation
¥
Memory
¥
Continuous on-the-fly monitoring of
external and internal conditions (acoustic
and line) provides high-quality, hands-free,
conversation in a changing environment
Supports up to four 4-Mbit, four 8-Mbit, or
four 16-Mbit Flash devices from Toshiba or
Samsung
¥
Supports up to four 16-Mbit ARAM/DRAM
memory devices from Toshiba, Samsung,
and Samsung-compatible
¥
Minimum microcontroller control
intervention (Launch-and-forget)
¥
The number of messages that can be
stored is limited only by memory size
¥
Supports: On, Off, Mute, and Hold
functions
¥
Direct access to message memory
ii
Voice Solutions in Silicon™
ISD-T360SB
¥
Message storage contains all data in a
concatenated chain of memory blocks.
¥
Memory mapping and product floor test
included
¥
Supports external vocabularies, using Flash
memory or expansion ROM
Microwire
¥
MICROWIRE slave interface to an external
microcontroller
¥
Sophisticated command language to
optimize system code size
INTERNATIONAL VOCABULARY SUPPORT (IVS)
Develop a new vocabulary by ISD’s voice
prompt development tool, the ISD-IVS360. This
vocabulary development tool supports various
languages and including their unique grammar
structures. ISD-IVS360, PC-Windows95™-based
program, synthesizes recorded .wav files into the
ISD-T360SB’s various compression rates (including
PCM).
ISD’s VoiceDSP products store IVS vocabularies
on either Flash memory or expansion ROM memories, thus DTAD manufacturers can design a
product for multiple countries, featuring various
languages.
For more details about IVS, refer to the IVS User’s
Guide.
For manufacturing recorded voice prompt and
speech synthesis, the ISD International Vocabulary Support delivers pre-recorded voice
prompts in the same high-quality of the user-recorded speech. For complete control over quality and memory management, the IVS features
adjustable speech compressions. In addition,
several pre-recorded voice prompt sets are
available in various languages for further convenience.
Available Languages:
¥
English
¥
Japanese
¥
Mandarin
¥
German
¥
French
¥
Spanish
ISD
iii
ISD-T360SB
Figure 1-1: ISD-T360SB Block Diagram—Basic Configuration with Four 4Mb/8Mb/16Mb
NAND Flash Devices (Samsung/Toshiba)
iv
Voice Solutions in Silicon™
ISD-T360SB
Figure 1-2: ISD-T360SB Block Diagram—Basic Configuration with Four 4Mb Serial Toshiba Flash Devices
ISD
v
ISD-T360SB
Figure 1-3: ISD-T360SB Block Diagram—Basic Configuration with Four 16Mb ARAM/DRAM Devices
(Samsung) and IVS EPROM
vi
Voice Solutions in Silicon™
ISD-T360SB
1—HARDWARE
Chapter 1ÑHARDWARE
1.1
PIN ASSIGNMENT
1.1.1
PIN-SIGNAL ASSIGNMENT
Table 1-1 shows all the pins, and the signals that
use them in different configurations. It also shows
the type and direction of each signal.
The following sections detail the pins of the ISDT360SB processor. Slashes separate the names of
signals that share the same pin.
VSS
VCCA
CAS/MMCLK
VCC
A7
A8
A6
A5
A4
A3
A2
VCC
VSS
A1
NC
A0
NC
NC
NC
NC
Figure 1-1: 80-MQFP Package Connection Diagram
80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61
A9
1
60
VSSA
A10
2
59
X2/CLKIN
RAS/MMDOUT
DWE/MMDIN
3
4
58
X1
57
TST
NC
D0
5
56
NC
6
55
NC
D1
7
54
NC
D2
VSS
D3
8
53
MWRDY
ISD-T360SB
52
MWDOUT
80-MQFP
51
NC
VSS
9
10
VCCHI
VCC
11
12
D4
13
D5
14
47
MWCLK
D6
15
46
MWDIN
50
49
Top View
48
MWRQST
VCC
D7
16
45
CCLK
PC0/A11
17
44
CDIN
NC
18
43
CFS0
NC
NC
19
42
CDOUT
20
41
CFS1
ISD
NC
RESET
PB7
MWCS
PB6
PB5
PB4
VSS
PB3
PB2
VCC
PB1
PB0
PC7
PC6/EMCS/ENV0
PC4/A15
PC5
PC3/A14
PC1/A12
PC2/A13
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
1-1
ISD-T360SB
1—HARDWARE
Table 1-1: VoiceDSP Pin Signal Assignment
Pin Name
Signal Name
Type
Description
A(0:15)
A(0:16)
Output
Address bits 0 through 16
CAS
CAS
Output
DRAM Column Address Strobe
CCLK
CCLK
I/O
Codec Master/slave Clock
CDIN
CDIN
Input
Data Input from Codec
CDOUT
CDOUT
Output
Data Output to Codec
CFS0
CFS0
I/O
Codec 0 Frame Synchronization
CFS1
CFS1
Output
Codec 1 Frame Synchronization
D(0:7)
D(0:7)
I/O
Data bits 0 through 7
DWE
DWE
Output
DRAM Write Enable
EMCS/ENV0
EMCS
Output
Expansion Memory Chip Select
EMCS/ENV0
ENV0
Input
Environment Select
MMCLK
MMCLK
Output
Master MICROWIRE Clock
MMDIN
MMDIN
Input
Master MICROWIRE Data Input
MMDOUT
MMDOUT
Output
Master MICROWIRE DATA Output
MWCLK
MWCLK
Input
MICROWIRE Clock
MWCS
MWCS
Input
MICROWIRE Chip Select
MWDIN
MWDIN
Input
MICROWIRE Data Input
MWDOUT
MWDOUT
Output
MICROWIRE DATA Output
MWRDY
MWRDY
Output
MICROWIRE Ready
MWRQST
MWRQST
Output
MICROWIRE Request Signal
PB(0:7)3
PB(0:7)
I/O
Port B, bits 0 through 7
PC(0:7)
PB(0:7)
I/O
Port C, bits 0 through 7
RAS
RAS
Output
DRAM Row Address Strobe
RESET
RESET
Input
Reset
TST
TST
Input
Test pin
VCC
VCC
Power
3.3 V power supply pin
VCCA
VCCA
Power
3.3 V analog circuitry power supply pin
VCCHI
VCCHI
Power
5 V power supply pin. Connect to VCC if 3.3 V power supply is
used.
VSS
VSS
Power
Ground for on-chip logic and output drivers
VSSA
VSSA
Power
Ground for on-chip analog circuitry
X1
X1
Oscillator
Crystal Oscillator Interface
X2/CLKIN
X2
Oscillator
Crystal Oscillator Interface
1.
2.
3.
4.
5.
TTL1 output signals provide CMOS levels in the
steady state, for small loads.
Input during reset. CMOS level input.
Virtual address lines for IVS ROM.
Chip select lines for Serial Flash devices.
Schmitt trigger input.
1-2
Voice Solutions in Silicon™
ISD-T360SB
1—HARDWARE
1.2
DESCRIPTION
This section provides details of the functional
characteristics of the VoiceDSP processor. It is divided into the following sections:
If the load on the ENV0 pin causes the current to
exceed 10 µA, use an external pull-up resistor to
keep the pin at 1.
• Resetting
Figure 1-2 shows a recommended circuit for
generating a reset signal when the power is
turned on.
• Clocking
• Power-Down Mode
• Power and Grounding
• Memory Interface
Figure 1-2: Recommended Power-On Reset
Circuit
• Codec Interface
VCC
VCC
1.2.1
ISD-T360
RESETTING
The RESET pin is used to reset the VoiceDSP processor.
RESET
On application of power, RESET must be held low
for at least tpwr after VCC is stable. This ensures
that all on-chip voltages are completely stable
before operation. Whenever RESET is applied, it
must also remain active for not less than t RST, see
Table 1-10 and Table 1-11. During this period,
and for 100 ms after, the TST signal must be high.
This can be done with a pull-up resistor on the TST
pin.
The value of MWRDY is undefined during the reset period, and for 100 ms after. The microcontroller should either wait before polling the signal
for the first time, or the signal should be pulled
high during this period.
Upon reset, the ENV0 signal is sampled to determine the operating environment. During reset,
the EMCS/ENV0 pin is used for the ENV0 input signals. An internal pull-up resistor sets ENV0 to 1.
After reset, the same pin is used for EMCS.
System Load on ENV0
For any load on the ENV0 pin, the voltage should
not drop below VENVh (see Table 1-10 and
Table 1-11).
ISD
VSS
1.2.2
CLOCKING
The VoiceDSP processor provides an internal oscillator that interacts with an external clock
source through the X1 and X2/CLKIN pins. Either
an external single-phase clock signal, or a crystal
oscillator, may be used as the clock source.
External Single-Phase Clock Signal
If an external single-phase clock source is used, it
should be connected to the CLKIN signal as
shown in Figure 1-3, and should conform to the
voltage-level requirements for CLKIN stated in
“ELECTRICAL CHARACTERISTICS” on page 1-18.
1-3
ISD-T360SB
1—HARDWARE
Figure 1-3: External Clock Source
Table 1-2 lists the components in the crystal oscillator circuit
Table 1-2:
VoiceDSP
X1
X2/CLKIN
Components of Crystal Oscillator
Circuit
Component
Values
Tolerance
Crystal Resonator
4.096 MHz
Resistor R1
10 MΩ
5%
Capacitors C1,
C2
33 pF
20%
Single-phase Clock Signal
Clock Generator
Crystal Oscillator
A crystal oscillator is connected to the on-chip
oscillator circuit via the X1 and X2 signals, as
shown in Figure 1-4.
Figure 1-4: Connections for an External
Crystal Oscillator
X1
R1
C2
C1
Keep stray capacitance and inductance, in the
oscillator circuit, as low as possible. The crystal
resonator, and the external components, should
be as close to the X1 and X2/CLKIN pins as possible, to keep the trace lengths in the printed circuit to an absolute minimum.
You can use crystal oscillators with maximum
load capacitance of 20 pF, although the oscillation frequency may differ from the crystal’s specified value.
1-4
POWER-DOWN MODE
Power-down mode is useful during a power failure or in a power-saving model, when the power
source for the processor is a backup battery or in
battery-powered devices, while the processor is
in idle mode.
In power-down mode, the clock frequency of
the VoiceDSP processor is reduced and some of
the processor modules are deactivated. As a result, the ISD-T360SB consumes considerably less
power than in normal-power mode. Although
the VoiceDSP processor does not perform all its
usual functions in power-down mode, it does retain stored messages and maintain the date and
time.
ISD-T360
X2
1.2.3
NOTE
In power-down mode all the chip select
signals, CS0 to CS3, are set to 1. To guarantee that there is no current flow from these
signals to the Flash devices, the power supply to these devices must not be
disconnected.
The ISD-T360SB stores messages and all memory
management information in Flash or ARAM/
DRAM memory. When Flash memory is used for
memory management, power does not need to
be maintained to the processor to preserve
stored messages. When ARAM/DRAM memory is
used for message management, preserving
stored messages requires a battery back up dur-
Voice Solutions in Silicon™
ISD-T360SB
1—HARDWARE
ing a power failure. If the power failure extends
the life of the battery, the microcontroller should
perform the initialization sequence (as described
on page 2-4), and use the SETD command to set
the date and time.
Figure 1-5 when operating in a 3.3 V environment, and as shown in Figure 1-6 when operating in a 5 V environment. Failure to correctly
connect the pins may result in damage to the
device.
To keep power consumption low during powerdown mode, the RESET, MWCS, MWCLK and
MWDIN signals should be held above V CC – 0.5 V
or below VSS + 0.5 V.
The Capacitor and Resistor values are given in
Table 1-3.
Table 1-3:
Components of Supply Circuit
Component
1.2.4
POWER AND GROUNDING
Power Pin Connections
The ISD-T360 can operate over two supply voltage ranges 3.3 V ±10% and 5 V ±10%. The five
power supply pins (VCC, VSS, VCCA, VSSA and
VCCHI) must be connected as shown in
Values
Tolerance
Resistor R1, R2
10 Ω
5%
Capacitors(1) C1, C2
Capacitors C3, C4,
C5, C6, C7
1.0 µF
Tantalum
0.1 µF Ceramic
20%
1.
All capacitors represent two parallel capacitors at
the values 1.0 µF and 0.1 µF.
Figure 1-5: 3.3 V Power Connection Diagram
R1
3.3 V Supply
VSS
VSS
VCCHI
VCC
VCC VCC VCCA VSS
74
72
11
63
ISD-T360
12
61
VSSA
60
50
48
30
VCC
ISD
64
9
C1
VSS
VCC
32
VSS
1-5
ISD-T360SB
1—HARDWARE
Figure 1-6: 5 V Power Connection Diagram
C6
R2
C5
VSS
VSS
VCC VCC VCCA
74
72
64
VSS C7
63
9
61
V A
60 SS
5 V Supply
C2
VCCHI
11
VCC
12
50
ISD-T360
VSS
C4
48
30
32
VCC
VCC
VSS
C3
For optimal noise immunity, the power and
ground pins should be connected to V CC and
the ground planes, respectively, on the printed
circuit board. If VCC and the ground planes are
not used, single conductors should be run directly from each VCC pin to a power point, and from
each GND pin to a ground point. Avoid daisychained connections. The VoiceDSP does not
perform its usual functions in power-down mode
but it still preserves stored messages, maintains
the time of day and generates ARAM/DRAM refresh cycles.
When you build a prototype, using wire-wrap or
other methods, solder the capacitors directly to
the power pins of the VoiceDSP processor socket, or as close as possible, with very short leads.
1-6
1.2.5
MEMORY INTERFACE
Flash Support
The ISD-T360SB VoiceDSP supports Flash devices
for storing recorded data, thus, power can be
disconnected to the ISD-T360SB without losing
data. The ISD-T360SB supports serial and semiparallel Flash device interfaces, such as
TC58V16BFT, TC5816BFT, TC58A040F, KM29N040T,
KM2928000T/IT, and KM29216000AT/AIT. The ISDT360SB may be connected to up to four Flash devices, resulting with maximum recording storage
of 16-Mbits x 4 = 64 Mbits (up to 4 hours of recording time).
The following flash devices are supported:
Voice Solutions in Silicon™
ISD-T360SB
1—HARDWARE
Table 1-4: Supported Flash Devices
Manufacturer
Memory Device
Name
Characteristics
Operating
Voltage
Memory Size Conversion Type
Toshiba
TC58V16BFT
2Mx8
3.3 V
16-Mbit LV
µ-Law
Toshiba
TC5816BFT
2Mx8
5V
16-Mbit
A-Law
Toshiba
TC58A040F
Serial
5V
4-Mbit
µ-Law, A-Law
Samsung
KM29N040T
512Kx8
5V
4-Mbit
µ-Law, A-Law,
LV
Samsung
KM29W8000T/IT
1Mx8
5V
8-Mbit
µLaw
Samsung
KM29W16000AT
/AIT
2Mx8
5V
16-Mbit
A-Law
Internal Memory Organization
Toshiba Serial Flash
The Flash devices detailed in Table 1-4 divide internally into basic 4-Kbyte block units. The ISDT360SB uses one block on each device for memory management, leaving the rest of the blocks
available for recording. Using at least one block
for a single recorded message yields a maximum
of NUM_OF_BLOCKS_IN_MEM – 1 (see Table 2-10
for parameter definition) messages per device.
The VoiceDSP processor supports up to four
TC58A040F, 4Mbit, serial interface, Flash memory
devices for storing messages. The TC58A040F is
organized as an array of 128 blocks, with a dedicated, read-only, bad block map programmed
by the manufacturer and located in the last
block. This map is used by the ISD-T360SB to define the available blocks for recording. The ISDT360SB uses the VoiceDSP master MICROWIRE interface to communicate, serially, with the Flash
devices, while selecting the current Flash device
using PB3-PB6. Connecting less than four Flash
devices require connecting the Flash devices sequentially, starting from PB3 up to PB6 (see
Figure 1-7). Refer to Figure 1-34for the Master MICROWIRE timing diagram.
Upon initialization the ISD-T360SB activates a sifting algorithm to detect defected blocks. Defected blocks are defined as blocks with over 10
bad nibbles (a nibble consists of 4 bits). The defected blocks are marked as UNUSED and excluded from the list of available blocks for
recording.
ISD
1-7
ISD-T360SB
1—HARDWARE
Figure 1-7: Memory Interface with Four Toshiba 4Mbit Serial Flash Devices and
Optional Voice IVS EPROM
1-8
Voice Solutions in Silicon™
1—HARDWARE
ISD-T360SB
Figure 1-8: Memory Interface with Four 4MB/16 Mbit, NAND Flash Devices (Samsung, Toshiba)
NAND Flash (Samsung, Toshiba)
The VoiceDSP processor supports up to four,
semi-parallel interface, Flash memory devices for
storing messages. Flash device with semi-parallel
interface uses a single 8bit I/O port to set the address and access the data. The ISD-T360SB supports three types of Flash volumes (4Mbit, 8Mbit
and 16Mbit as listed in Table 1-4) while all the
connected Flash devices must be of the same
type. Ports B and C are used to connect ISDT360SB to the Flash devices using port B for address and data transfer and port C for communication control and chip select. Connecting less
than four Flash devices require connecting the
Flash devices sequentially, starting from PC4 up
to PC7 (see Figure 1-8). The ISD-T360SB scans the
Flash devices upon initialization, sifting out the
bad blocks, and marking them in a special map,
located in the last block of each device.
ISD
1-9
ISD-T360SB
1—HARDWARE
Figure 1-9: Memory Interface with Four Toshiba 4Mbit Serial Flash Devices and
Optional IVS EPROM
Flash Endurance
A Flash memory may be erased a limited number of times. To maximize the Flash use, the memory manager utilizes the Flash’s blocks evenly
(i.e., each block is erased more or less the same
number of times), to ensure that all blocks have
the same lifetime. Refer to the respective Flash
memory device data sheets for specific endurance specifications.
A VoiceDSP processor message uses at least one
block.
1-10
The maximum recording time depends on four
factors:
1.
The basic compression rate (5.3 Kbit/s,
9.9Kbit/s, or 16.8Kbit/s).
2.
The amount of silence in the recorded
speech.
3.
The number of bad blocks.
Voice Solutions in Silicon™
ISD-T360SB
1—HARDWARE
The number of recorded messages. (The basic
memory allocation unit for a message is a 4Kbyte block, which means that half a block on
average is wasted per recorded message).
Table 1-5:
Recording Time with 15% Silence
Compression
Compression
Rate
Total Recording
Time
4 Mbit
5.3 Kbit/s
14.9 Minutes
4 Mbit
9.9 Kbit/s
8.1 Minutes
4 Mbit
16.8 Kbit/s
4.8 Minutes
8 Mbit
5.3 Kbit/s
29.8 Minutes
8 Mbit
9.9 Kbit/s
16.2 Minutes
8 Mbit
16.8 Kbit/s
9.6 Minutes
16 Mbit
5.3 Kbit/s
59.6 Minutes
16 Mbit
9.9 Kbit/s
32.4 Minutes
16 Mbit
16.8 Kbit/s
19.2 Minutes
32 Mbit
5.3 Kbit/s
119.2 Minutes
32 Mbit
9.9 Kbit/s
64.8 Minutes
32 Mbit
16.8 Kbit/s
38.4 Minutes
Memory Size
ARAM/DRAM Support
The VoiceDSP processor supports up to four,
16-Mbit, ARAM/DRAM devices for storing messages. The ISD-T360 connects to the ARAM/
DRAM device using address buses A0–A11 and
data buses D0–D3. This connection allows access to 222 nibbles (16-Mbit) on each device. The
ISD-T360SB selects the current ARAM/DRAM device using PB3–PB6 as described in Figure 1-10.
Using less than four ARAM/DRAM devices requires connecting the devices sequentially,
starting from PB3 up to PC6. RAS and CAS are
connected in parallel to all the ARAM/DRAM devices and are used to refresh the memory. The
difference between ARAM and DRAM resides
with the amount of bad cells on the device and
the device performance. While DRAM has no
bad cells, ARAM contains certain level of impurity and thus requires testing and mapping of the
bad blocks upon the initialization of the ISDT360SB. Although there are no real blocks on the
ISD
ARAM device, the ISD-T360SB emulates virtual
“blocks” on the ARAM device (as if it was a Flash
device), tests these “blocks” and marks them in
a special map on the last “block” on each device. This test is required only when using ARAM
devices (as opposed to DRAM devices that require no testing due to lack of bad blocks). The
virtual division to blocks simplifies the use of
ARAM/DRAM devices and allows the use of the
same set of commands for Flash and ARAM/
DRAM.
Another major difference between ARAM/
DRAM and Flash devices is that the internal mapping in the ARAM is lost upon power off. Thus, the
initialization process needs to take place after
each power reset. The mapping is not lost when
entering and exiting the Power-Down Mode.
Refer to Figure 1-24 through Figure 1-28 for Timing
Diagrams of ARAM/DRAM Read, Write, Refresh in
Normal Mode and Refresh in Power-Down Mode
Cycles.
ROM Interface
IVS vocabularies can be stored in either Flash
memory and/or ROM. The VoiceDSP processor
supports IVS ROM devices through an Expansion
Memory mechanism. Up to 64 Kbytes (64K x 8) of
Expansion Memory are directly supported. Nevertheless, the processor uses bits of the on-chip
port (PB) to further extend the 64 Kbytes address
space up to 0.5 Mbytes address space.
ROM is connected to the VoiceDSP processor using the data bus, D(0:7), the address bus,
A(0:15), the extended address signals, EA(16:18),
and Expansion Memory Chip Select, EMCS, controls. The number of extended address pins to
use may vary, depending on the size and configuration of the ROM. ISD-T360SB configured with
semi-parallel Flash memory can not support extension ROM.
1-11
ISD-T360SB
1—HARDWARE
Figure 1-10: Memory Interface with Four 16-Mbit ARAM/DRAM Devices (Samsung, Toshiba) and
Optional IVS EPROM
Table 1-6: Supported DRAM Devices
Manufacturer
Memory Device
Name
Characteristics
Operating Voltage
Memory Size
Samsung
KM44C4004CS-6
EDO 4Mx4
5V
16-Mbit EDO LV
Samsung
KM44V4004CS-6
EDO 4Mx4
3.3 V
16-Mbit EDO
Toshiba
TP
EDO 4Mx4
5V, 3.3V
16-Mbit EDO, LV
1-12
Voice Solutions in Silicon™
ISD-T360SB
1—HARDWARE
1.2.6
THE CODEC INTERFACE
The ISD-T360 provides an on chip interface for
analog and digital telephony, supporting master
and slave codec interface modes. In master
mode, the ISD-T360 controls the operation of the
codec for use in analog telephony. In the slave
mode, the ISD-T360 codec interface is controlled
by an external source. This mode is used in digital
telephony (i.e., ISDN or DECT lines). The slave
mode is implemented with respect to IOM-2™/
CGI specifications.
See Table 1-7 for codec options for the ISDT360SB (ISD supports compatible codecs in addition to those listed below).
The codec interface supports the following features:
• Master Mode or Slave Mode.
• 8- or 16-bit Channel Width.
• Long (Variable) or Short (Fixed) Frame
Protocol.
• Single or Double Bit (Slave Mode Only)
Clock Rate.
CDIN, CDOUT, CCLK, and CFS1 pins. Data is
transferred to the codec through the CDOUT
output pin. Data is read from the codec through
the CDIN input pin. The CCLK and CFS0 pins are
output in Master Mode and input in Slave Mode.
The CFS1 is an output pin.
Short Frame Protocol
When the short frame protocol is configured,
eight or sixteen data bits are exchanged with
each codec in each frame (i.e., the CFS0 cycle).
Data transfer begins when CFS0 is set to 1 for one
CCLK cycle. The data is then transmitted, bit by
bit, via the CDOUT pin. Concurrently, the received data is shifted in through the CDIN pin.
Data is shifted one bit per CCLK cycle. After the
last bit has been shifted, CFS1 is set to 1 for one
CCLK cycle. Then, the data from the second codec is shifted out via CDOUT, concurrently with
the inward shift of the data received via CDIN.
Long Frame Protocol
• Single or Dual Channel Codecs
• One or Two Codecs
• Multiple Clock And Sample Rates.
• One or Two Frame Sync Signals
This codec interface uses five signals: CDIN, CDOUT, CCLK, CFS0, and CFS1. The CDIN, CDOUT,
CCLK, and CFS0 pins are connected to the first
codec. The second codec is connected to
When long frame protocol is configured, eight or
sixteen data bits are exchanged with each codec, as for the short frame protocol. However,
for the long frame protocol, data transfer starts
by setting CFS0 to 1 for eight or sixteen CCLK cycles. Short or long frame protocol is available in
both Master and Slave modes. Figure 1-11 illustrates an example of short frame protocol with
an 8-bit channel width.
Table 1-7: Supported Codec Devices
Manufacturer
Codec Device Name
Characteristics
Operating Voltage
Conversion Type
National
Semiconductor
TP3054
Single codec
5V
µ-Law
National
Semiconductor
TP 3057
Single codec
5V
A-Law
Oki
MSM7533V
Dual codec
5V
µ-Law, A-Law
Oki
MSM 7704
Dual codec
3.3 V
µ-Law, A-Law, LV
Macronix
MX93002FC
Dual codec
5V
µ-Law
Lucent
T7502
Dual codec
5V
A-Law
Lucent
T7503
Dual codec
5V
µ-Law
ISD
1-13
ISD-T360SB
1—HARDWARE
Figure 1-11: Codec Protocol-Short Frame—8-Bit Channel Width
Channel Width
The Codec interface supports both 8-bit and 16bit channel width in Master and Slave Modes.
Slave Mode
The VoiceDSP supports digital telephony applications including DECT and ISDN by providing a
Slave Mode of operation. In Slave Mode operation, the CCLK signal is input to the ISD-T360 and
controls the frequency of the codec interface
operation. The CCLK may take on any frequency between 500 KHz and 4 MHz. Both long and
short frame protocol are supported with only the
CFS1 output signal width affected. The CFS0 input signal must be a minimum of one CCLK cycle.
This interface supports ISDN protocol with one bit
clock rate or double bit clock rate. The exact format is selected with the CFG command. The
slave codec interface uses four signals: CDIN,
CDOUT, CCLK, and CFS0. The CDIN, CCLK, and
CFS0 input pins and the CDOUT output pins are
connected to the ISDN/DECT agent. Data is
transferred to the VoiceDSP through the CDIN
pin and read out through the CDOUT pin. The
CFS0 pin is used to define the start of each frame
(see below) the source of that signal is at the
master side. The CCLK is used for bit timing of
CDIN and CDOUT. The rate of the CCLK is configured via the CFG command and can be twice
of the data rate or at the data rate. The source
of that signal is at the master side.
In slave mode, a double clock bit rate feature is
available as well. When the codec interface is
configured to double clock bit rate, the CCLK input signal is divided internally by two and the resulting clock used to control the frequency of the
codec of the codec interface operation.
1-14
Voice Solutions in Silicon™
ISD-T360SB
1—HARDWARE
Table 1-8: Typical Codec Applications
Application
Codec
Type
No. of
Channels
Master/
Slave
Channel
Width
(No. Bits)
Long/
CCLK
Short
Bit Rate Freq.
Frame
(MHz)
Protocol
Sample
Rate (Hz)
No. of
Frame
Syncs
Analog µLaw
single
1
Master
8
short or
long
1
2.048
8000
1
ISDN—8 bit
digital—ALaw
dual
2
Slave
8
short
1 or 2
2.048
8000
1
Linear
single
1
Master
16
short
1
2.048
8000
1
IOM-2/GCI
single
or dual
1–2
Slave
8
short
1 or 2
1.536
8000
1
266
Compatibility
single
or dual
1 or 2
Master
8
long or
short
1
2.048
8000
1 or 2
Figure 1-12: Codec Interface with One Single Codec, NSC TP3054, for Single Line Operation
ISD
1-15
ISD-T360SB
1—HARDWARE
Figure 1-13: Codec Interface Diagram with Two, Single Codecs, NSC TP3054, and NSC TP3057, for
Speakerphone Operation
Figure 1-14: Codec Interface for Dual Line or Single Line and Speakerphone Operation
with OKI Dual Codec
1-16
Voice Solutions in Silicon™
1—HARDWARE
ISD-T360SB
Figure 1-15: Codec Interface for Dual Line or Single Line and Speakerphone
with Lucent Dual Codec
Figure 1-16: Codec Interface for Dual Line or Single Line and Speakerphone Operation
with Macronix Dual Codec
ISD
1-17
ISD-T360SB
1—HARDWARE
1.3
SPECIFICATIONS
1.3.1
ABSOLUTE MAXIMUM RATINGS
Storage temperature
–65˚C to +150˚C
Temperature under bias
0˚C to +70˚C
All input and output
voltages with respect to
GND
–0.5 V to +6.5 V
1.3.2
NOTE
Absolute maximum ratings indicate limits
beyond which permanent damage may
occur. Continuous operation at these limits
is not intended; operation should be limited
to the conditions specified below.
ELECTRICAL CHARACTERISTICS
TA = 0ºC to +70ºC, VCC = 5 V ±10% Or 3.3 V ±10%, GND = 0 V
Table 1-9: Electrical Characteristics—Preliminary Information
(All Parameters with Reference to VCC = 3.3 V)
Symbol
Parameter
Conditions
Min
Capacitance1
Typ
CX
X1 and X2
ICC1
Active Supply Current
Normal Operation Mode,
Running Speech Applications2
40.0
ICC2
Standby supply current
Normal Operation Mode, DSPM
Idle2
30.0
ICC3
Power-down Mode Supply
Current
Power-down Mode2,3
IL
Input Load Current
0 V ≤ VIN ≤ VCC
IO (Off)
Output Leakage Current
(I/O pins in Input Mode)
0 V ≤ VOUT ≤ VCC
tCASa
CAS Active
After R.E. CTTL, T1 or T2W3
tCASh
CAS Hold
After R.E. CTTL
tCASia
CAS Inactive
After R.E. CTTL, T3 or TERF
tCASLw
DRAM, PDM, CAS Width
At 0.8 V, Both Edges
Max
17.0
pF
80.0
mA
mA
0.7
mA
–5.0
5.0
µA
–5.0
5.0
µA
12.0
0.0
12.0
600.0
tDWEa
DWE Active
After R.E. CTTL, T2W2
12.0
tDWEh
DWE Hold
After R.E. CTTL
12.0
tDWEia
DWE Inactive
After R.E. CTTL, T3
12.0
tRASa
RAS Active
After R.E. CTTL, T2W1 or T2WRF
12.0
tRASh
RAS Hold
After R.E. CTTL
tRASia
RAS Inactive
After R.E. CTTL, T3 or T3RF
tRASLw
DRAM PDM, RAS Width
At 0.8 V, Both Edges
200.0
tRLCL
DRAM PDM RAS Low, after
CAS Low
F.E. CAS to F.E. RAS
200.0
tWRa
WR0 Active
After R.E. CTTL, T1
1-18
Units
0.0
12.0
tCTp/2+2
Voice Solutions in Silicon™
ISD-T360SB
1—HARDWARE
Table 1-9: Electrical Characteristics—Preliminary Information
(All Parameters with Reference to VCC = 3.3 V)
Symbol
Parameter
Conditions
4
Min
Typ
Max
Units
tWRCSh
WR0 Hold after EMCS
R.E. EMCS R.E. to R.E. WR0
tWRh
WR0 Hold
After R.E. CTTL
tWRia
WR0 Inactive
After R.E. CTTL, T3
VENVh
ENV0 Input, High Voltage
2.0
V
VHh
CMOS Input with Hysteresis,
Logical 1 Input Voltage
2.1
V
VHl
CMOS Input with Hysteresis,
Logical 0 Input Voltage
VHys
Hysteresis Loop Width1
0.5
VIH
TTL Input, Logical 1 Input
Voltage
2.0
VCC+0.5
V
VIL
TTL Input, Logical 0 Input
Voltage
–0.5
0.8
V
VOH
Logical 1 TTL, Output
Voltage
IOH = –0.4 mA
2.4
V
VOHWC
MMCLK, MMDOUT and
EMCS Logical 1, Output
Voltage
IOH = –0.4 mA
2.4
V
µA5
VCC–0.2
V
VOL
VOLWC
Logical 0, TTL Output
Voltage
IOH = –50
IOL = 4 mA
IOL = 4 mA
VXH
CLKIN Input, High Voltage
External Clock
VXL
CLKIN Input, Low Voltage
External Clock
5.
ISD
tCTp/2+2
IOL = 50 µA5
IOL = 50 µA5
3.
4.
tCTp/2–6
0.8
MMCLK, MMDOUT and
EMCS Logical 0, Output
Voltage
1.
2.
10.0
V
V
0.45
V
0.2
V
0.45
V
0.2
V
2.0
V
0.8
V
Guaranteed by design.
IOUT =0, TA 25˚C, VCC = 3.3 V for VCC pins and 3.3 V or 5 V on VCCHI pins, operating from a 4.096 MHz crystal and
running from internal memory with Expansion Memory disabled.
All input signals are tied to 0 (above VCC – 0.5 V or below VSS + 0.5 V), except ENV0, which is tied to VCC.
Measured in power-down mode. The total current driven, or sourced, by all the VoiceDSP processor’s output signals
is less than 50 µA.
Guaranteed by design, but not fully tested.
1-19
ISD-T360SB
1.3.3
1—HARDWARE
SWITCHING CHARACTERISTICS—PRELIMINARY
Definitions
All timing specifications in this section refer to
0.8 V or 2.0 V on the rising or falling edges of the
signals, as illustrated in Figure 1-17 through
Figure 1-23, unless specifically stated otherwise.
Maximum times assume capacitive loading of
50pF. CLKIN crystal frequency is 4.096 MHz.
NOTE
CTTL is an internal signal and is used as a reference to explain the timing of other
signals. See Figure 1-37.
Figure 1-17: Synchronous Output Signals (Valid, Active and Inactive)
2.0V
CTTL or
MWCLK
2.0V
Signal
0.8V
tSignal
NOTE:
Signal valid, active or inactive time, after a rising edge of CTTL or MWCLK.
Figure 1-18: Synchronous Output Signals (Valid)
MWCLK
0.8V
2.0V
Signal
0.8V
tSignal
NOTE:
1-20
Signal valid time, after a falling edge of MWCLK.
Voice Solutions in Silicon™
ISD-T360SB
1—HARDWARE
Figure 1-19: Synchronous Output Signals (Hold), after Rising Edge of CTTL
2.0V
CTTL
2.0V
Signal
0.8V
tSignal
NOTE:
Signal hold time, after a rising edge of CTTL.
Figure 1-20: Synchronous Output Signals (Hold), after Falling Edge of MWCLK
2.0V
MWCLK
2.0V
Signal
0.8V
tSignal
NOTE:
Signal hold time, after a falling edge of MWCLK.
Figure 1-21: Synchronous Input Signals
CTTL or
MWCLK
2.0 V
2.0 V
2.0 V
0.8 V
0.8 V
Signal
tSignal
NOTE:
ISD
Setup
tSignal Hold
Signal setup time, before a rising edge of CTTL or MWCK, and signal hold time after a rising edge of CTTL or MWCK
1-21
ISD-T360SB
1—HARDWARE
Figure 1-22: Asynchronous Signals
2.0 V
Signal A
0.8 V
2.0 V
Signal B
0.8 V
tSignal
NOTE:
Signal B starts after rising or falling edge of signal A.
The RESET has a Schmitt trigger input buffer. Figure 1-23 shows the input buffer characteristics.
Figure 1-23: Hysteresis Input Characteristics
Vout
VHys
VHl
1-22
VHh
Voice Solutions in Silicon™
ISD-T360SB
1—HARDWARE
1.3.4
SYNCHRONOUS TIMING TABLES
In this section, R.E. means Rising Edge and F.E. means Falling Edge.
Table 1-10: Output Signals—Preliminary
Symbol
Figure
Description
Reference Conditions
Min (ns)
Max (ns)
tAh
Address Hold
After R.E. CTTL
tAv
Address Valid
After R.E. CTTL, T1
12.0
tCCLKa
CCLK Active
After R.E. CTTL
12.0
tCCLKh
CCLK Hold
After R.E. CTTL
tCCLKia
CCLK Inactive
After R.E. CTTL
tCDOh
CDOUT Hold
After R.E. CTTL
tCDOv
CDOUT Valid
After R.E. CTTL
Period1
0.0
12.0
0.0
12.0
tCTp
CTTL Clock
tEMCSa
EMCS Active
After R.E. CTTL, T2W1
tEMCSh
EMCS Hold
After R.E. CTTL
tEMCSia
EMCS Inactive
After R.E. CTTL T3
12.0
tFSa
CFS0 Active
After R.E. CTTL
25.0
tFSh
CFS0 Hold
After R.E. CTTL
tFSia
CFS0 Inactive
After R.E. CTTL
tMMCLKa
Master MICROWIRE Clock Active After R.E. CTTL
tMMCLKh
Master MICROWIRE Clock Hold
After R.E. CTTL
tMMCLKia
Master MICROWIRE Clock
Inactive
After R.E. CTTL
tMMDOh
Master MICROWIRE Data Out
Hold
After R.E. CTTL
tMMDOv
Master MICROWIRE Data Out
Valid
After R.E. CTTL
12.0
tMWDOf
MICROWIRE Data Float1
After R.E. MWCS
70.0
tMWDOh
tMWDOnf
R.E. CTTL to next R.E.
CTTL
0.0
MICROWIRE Data Out
MICROWIRE Data No
Hold2
Float2
Out Valid2
30.5
250,000
12.0
0.0
0.0
25.0
12.0
0.0
12.0
0.0
After F.E. MWCLK
0.0
After F.E. MWCS
0.0
70.0
tMWDOv
MICROWIRE Data
tMWITOp
MWDIN to MWDOUT
tMWRDYa
MWRDY Active
After R.E. of CTTL
0.0
35.0
tMWRDYia
MWRDY Inactive
After F.E. MWCLK
0.0
70.0
tPABCh
PB and MWRQST
After R.E. CTTL
0.0
tPABCv
PB and MWRQST
After R.E. CTTL, T2W1
1.
2.
ISD
After F.E. MWCLK
70.0
Propagation Time
70.0
12.0
In normal operation mode, tCTp must be 48.8 ns; in power-down mode, tCTp must be 50,000 ns.
Guaranteed by design, but not fully tested.
1-23
ISD-T360SB
1—HARDWARE
Table 1-11: Input Signals—Preliminary
Symbol
Figure
Description
Reference Conditions
Min (ns)
tCCLKSp
Codec Clock Period (slave)
R.E. CCLK to next R.E. CCLK
244
tCCLKSh
Codec Clock High (slave)
At 2.0 V (both edges)
120
tCCLKSl
Codec Clock Low (slave)
At 0.8 V (both edges)
120
tCDIh
CDIN Hold
After R.E. CTTL
0.0
tCDIs
CDIN Setup
Before R.E. CTTL
11.0
tCFS0Ss
CFS0 Setup
Before R.E. CCLK
TBD
tCFS0Sh
CFS0 Hold
After R.E. CCLK
TBD
tDIh
Data in Hold (D0:7)
After R.E. CTTL T1, T3 or TI
0.0
tDIs
Data in Setup (D0:7)
Before R.E. CTTL T1, T3 or TI
15.0
tMMDINh
Master MICROWIRE Data In
Hold
After R.E. CTTL
0.0
tMMDINs
Master MICROWIRE Data In
Setup
Before R.E. CTTL
11.0
tMWCKh
MICROWIRE Clock High
(slave)
At 2.0 V (both edges)
100.0
tMWCKl
MICROWIRE Clock Low
(slave)
At 0.8 V (both edges)
100.0
tMWCKp
MICROWIRE Clock Period
(slave)1
R.E. MWCLK to next R.E.
MWCLK
2.5 µs
tMWCLKh
MWCLK Hold
After MWCS becomes
inactive
50.0
tMWCLKs
MWCLK Setup
Before MWCS becomes
active
100.0
tMWCSh
MWCS Hold
After F.E. MWCLK
50.0
tMWCSs
MWCS Setup
Before R.E. MWCLK
100.0
tMWDIh
MWDIN Hold
After R.E. MWCLK
50.0
tMWDIs
MWDIN Setup
Before R.E. MWCLK
100.0
tPWR
Power Stable to RESET R.E.2
After VCC reaches 4.5 V
30.0 ms
tRSTw
RESET Pulse Width
At 0.8 V (both edges)
10.0 ms
tXh
CLKIN High
At 2.0 V (both edges)
tX1p/2 – 5
tXl
CLKIN Low
At 0.8 V (both edges)
tX1p/2 – 5
tXp
CLKIN Clock Period
R.E. CLKIN to next R.E. CLKIN
1.
2.
Max (ns)
244.4
Guaranteed by design, but not fully tested in power-down mode.
Guaranteed by design, but not fully tested.
1-24
Voice Solutions in Silicon™
ISD-T360SB
1—HARDWARE
1.3.5
TIMING DIAGRAMS
Figure 1-24: ROM Read Cycle Timing
1.
2.
3.
This cycle may be either TI (Idle), T3 or T3H.
Data can be driven by an external device at T2W1, T2W, T2 and T3.
This cycle may be either TI (Idle) or T1.
Figure 1-25: ARAM/DRAM Refresh Cycle Timing (Normal Operation)
1.
ISD
This cycle may be either TI (Idle) or T1 of any non-DRAM bus cycle. If the next bus cycle is a DRAM one, T3RF is
followed by three TI (Idle) cycles.
1-25
ISD-T360SB
1—HARDWARE
Figure 1-26: ARAM/DRAM Power-Down Refresh Cycle Timing
Figure 1-27: DRAM Read Cycle Timing
TI
T1
T2W1 T2W2 T2W3 6xT2W
T2
T3
TI
TI
(Note 2)
TI
T1
T2W1 T2W2 T2W3
CTTL
RAS
tRASa
tRASia
tRASh
tRASh
CAS
A0-10
or
A0-15
(Note 1) tAv
Row
tCASa
tCASia
tCASh
tCASh
Column
tAv
tAh
tAh
DWE
(Note 3)
D0-1,
D3-7
Data In
tDf
tDIs
tDIh
(Note 3)
D2/RA11
1.
2.
3.
RA11
D2 In
RA11
tDf
tDf
tDIs tDIh
tAv
A0-A10 in the IRE environment, when Expansion
Memory is disabled; otherwise A0-A15.
This cycle may be either TI (Idle) or T1 of any non-DRAM bus cycle. If the next bus cycle is to DRAM, T3 is followed by
three TI (Idle) cycles.
An external device can drive data from T2W3 to T3.
1-26
Voice Solutions in Silicon™
ISD-T360SB
1—HARDWARE
Figure 1-28: DRAM Write Cycle Timing
TI
T1
T2W1
T2W2 T2W3 6xT2W
T2
T3
TI
TI
(Note 2)
CTTL
RAS
tRASa
tRASia
tRASh
tRASh
CAS
A0-10
or
A0-15
(Note 1)
tCASa
tCASia
tCASh
tCASh
Row
Column
tAv
tAh
tAv
DWE
tDWEa
tDWEia
tDWEh
tDWEh
D0-1,
D3-7
Data Out
tDf
tDh
tDv
tDf
RA11
D2/RA11
tAv
D2 Out
tDv
tDh
tDf
1.
2.
ISD
A0–A10 in the IRE environment, when Expansion
Memory is disabled; otherwise A0–A15.
This cycle may be either TI (Idle) or T1 of any non-DRAM bus cycle. If the next bus cycle is to DRAM, T3 is followed by
three TI (idle) cycles.
1-27
ISD-T360SB
1—HARDWARE
Figure 1-29: Codec Short Frame Timing
tCTp
tCTp
tCTp
tCTp 4xtCTp tCTp
tCTp
tCTp
tCTp 4xtCTp tCTp
tCTp
tCTp
tCTp 4xtCTp tCTp
tCTp
tCTp
tCTp 4xtCTp tCTp
tCTp
tCTp
tCTp
CTTL
CCLK
tCCLKia
tCCLKa
tCCLKh
tCCLKh
CFS0/
CFS1
tFSia
tFSa
tFSh
tFSh
BIT 7
CDOUT
tCDOv
tCDOv
tCDOh
BIT 7
CDIN
tCDIs
NOTE:
tCDIh
The CCLK and CFS0 timing is shown for Master Mode only. For Slave Mode, see Figure 1-31.
Figure 1-30: Codec Long Frame Timing
tCTp
tCTp
tCTp
tCTp 4xtCTp tCTp
tCTp
tCTp
tCTp 4xtCTp tCTp
tCTp
tCTp
tCTp 4xtCTp tCTp
tCTp
tCTp
tCTp
CTTL
CCLK
tCCLKia
tCCLKa
tCCLKh
tCCLKh
CFS0/
CFS1
tFSia
tFSa
tFSh
tFSh
BIT 7
CDOUT
BIT 0
tCDOv
tCDOh
CDIN
NOTE:
1-28
BIT 7
The CCLK and CFS0 timing is shown for Master Mode only. For Slave Mode, see Figure 1-31.
Voice Solutions in Silicon™
ISD-T360SB
1—HARDWARE
Figure 1-31: Slave Codec CCLK and CFS0 Timing
tCCLKSp
CCLK
tCCLKSh
tCCLKSl
CFS0
tCFS0Ss
tCFS0Sh
Figure 1-32: MICROWIRE Transaction Timing—Data Transmitted to Output
ISD
1-29
ISD-T360SB
1—HARDWARE
Figure 1-33: MICROWIRE Transaction Timing—Data Echoed to Output
Figure 1-34: Master MICROWIRE Timing
1-30
Voice Solutions in Silicon™
ISD-T360SB
1—HARDWARE
Figure 1-35: Output Signal Timing for Port PB and MWRQST
NOTE:
This cycle may be either TI (Idle), T2, T3 or T3H.
Figure 1-36: CLKIN Timing
Figure 1-37: CTTL Timing
ISD
1-31
ISD-T360SB
1—HARDWARE
Figure 1-38: Reset Timing When Reset Is Not at Power-Up
Figure 1-39: Reset Timing When Reset Is at Power-Up
1-32
Voice Solutions in Silicon™
ISD-T360SB
2—SOFTWARE
Chapter 2ÑSOFTWARE
The VoiceDSP software resides in the on-chip
ROM. It includes DSP-based algorithms, system
support functions and a software interface to
hardware peripherals.
2.1
the processor detectors (VOX, constant energy,
call progress tones and DTMF) are not active. In
all other states, these detectors are active. (See
the SDET and RDET commands for further details).
SYSTEM OPERATION
This section provides details of the system support functions and their principle operation. It is
divided into the following subjects:
• The State Machine
IDLE
This is the state from which most commands are
executed. As soon as a command and all its parameters are received, the processor starts executing the command.
• Command Execution
• Event Handling
• Message Handling
• Tone Generation
PLAY
In this state a message is decompressed (unless
stored in PCM format), and played back.
• Initialization and Configuration
• Power Down Mode (PDM)
RECORD
In this state a message is compressed (unless
stored in PCM format) and recorded into the
message memory.
2.1.1
THE STATE MACHINE
The ISD-T360SB operates in two modes, normal
mode (DTAD) and speakerphone mode. To
change the mode use the Set Speakerphone
Mode (SSM) command. The VoiceDSP processor
functions as a state machine under each mode.
It changes state either in response to a command sent by the microcontroller, after execution of the command is completed, or as a result
of an internal event (e.g. memory full or power
failure). For more information see “VoiceDSP
PROCESSOR COMMANDS—QUICK REFERENCE
TABLE” on page 2-21. The VoiceDSP states are
desctibed below:
RESET
SYNTHESIS
An individual word or a sentence is synthesized
from an external vocabulary in this state.
TONE_GENERATE
In the TONE_GENERATE state, the VoiceDSP processor generates single or DTMF tones.
MSG_OPEN
The VoiceDSP processor either reads or writes 32
bytes to the message memory, or sets the message read/write pointer on a 32 byte boundary.
The VoiceDSP processor is initialized to the RESET
state after a full hardware reset by the RESET signal (See “RESETTING” on page 1-3). In this state
ISD
2-1
ISD-T360SB
2.1.2
COMMAND EXECUTION
A VoiceDSP processor command is represented
by an 8-bit opcode. Some commands have parameters and some have return values. Commands are either synchronous or asynchronous.
SYNCHRONOUS COMMANDS
A synchronous command must complete execution before the microcontroller can send a
new command (e.g. GMS, GEW). A command
sequence begins when the microcontroller
sends an 8-bit opcode to the processor, followed by the command’s parameters (if any).
The VoiceDSP processor then executes the command and, if required, transmits a return value to
the microcontroller. Upon completion, the processor notifies the microcontroller that it is ready
to accept a new command.
2—SOFTWARE
2.1.3
EVENT HANDLING
STATUS WORD
The 16-bit status word indicates events that occur during normal operation. The VoiceDSP processor activates the MWRQST signal, to indicate
a change in the status word. This signal remains
active until the processor receives a GSW (Get
Status Word) command.
For detailed description of the Status Word and
the meaning of each bit, see “GSW Get Status
Word” on page 2-33.
ERROR WORD
The 16-bit error word indicates errors that occurred during execution of the last command. If
an error is detected, the command is not processed; the EV_ERROR bit in the status word is set
to 1, and the MWRQST signal is activated.
ASYNCHRONOUS COMMANDS
An asynchronous command starts execution in
the background and notifies the microcontroller,
which can send more commands while the current command is still running (e.g. R, P). After receiving an asynchronous command, such as P
(Playback), R (Record), SW (Say Words) or GT
(Generate Tone), the VoiceDSP processor
switches to the appropriate state and executes
the command until finished or a S (Stop) or PA
(Pause) command is received from the microcontroller. When completed, the EV_NORMAL
_END event is set and the processor switches to
the IDLE state.
ERROR HANDLING
When the microcontroller detects the active
MWRQST signal, it issues the GSW command, deactivating the MWRQST signal. Then, the microcontroller tests the EV_ERROR bit in the status
word, and, if set, sends the GEW (Get Error Word)
command to read the error word for details.
For detailed description of the Error Word and
the meaning of each bit, see “GEW Get Error
Word” on page 2-30.
“VoiceDSP PROCESSOR COMMANDS—QUICK
REFERENCE TABLE” on page 2–21 displays all the
processor commands, the valid source states in
which these commands are valid, and the states
resulting from the command.
2-2
Voice Solutions in Silicon™
ISD-T360SB
2—SOFTWARE
2.1.4
MESSAGE HANDLING
A message is the basic unit on which most of the
VoiceDSP commands operate. A VoiceDSP processor message, stored on a memory device
(Flash or ARAM/DRAM), can be regarded as a
computer file stored on a mass-storage device.
The ISD-T360SB manages messages for a wide
range of applications, which require different
levels of DTAD functionality. The VoiceDSP processor features advanced memory-organization
features such as multiple OutGoing Messages
(OGMs), mailboxes, and the ability to distinguish
between InComing Messages (ICMs) and
OGMs.
A message is created with either the R (Record)
or the CMSG (Create Message) command.
Once created, the message is assigned a timeand-day stamp and a message tag which is
read by the microcontroller. The R command
takes voice samples from the codec, compresses them, and stores them in the message memory.
When a message is created with the CMSG
command the data to be recorded is provided
by the microcontroller, via the WMSG (Write Message) command and not through the codec.
Here, the data is transferred directly to the message memory, and not compressed by the ISDT360SB voice compression algorithm.
WMSG, RMSG (Read Message) and SMSG (Set
Message Pointer) are message-data access
commands used to store and read data to or
from any location in the message memory (see
“VoiceDSP PROCESSOR COMMANDS—QUICK
REFERENCE TABLE” on page 2-21 for more details). Using these commands, the microcontroller utilizes messages for features such as a
Telephone Directory and playing back (P command) or deleting (DM command) a message.
Remove redundant data (e.g., trailing tones or
silence) from the message tail with the CMT (Cut
Message Tail) command.
CURRENT MESSAGE
The GTM (Get Tagged Message) command selects the current message. Most message handling commands (P, DM, RMSG), operate on the
current message.
Deleting the prevailing message does not cause
a different message to become current; the current message is undefined. If you issue the GTM
command to skip to the next message, the first
message, newer than the just deleted message,
becomes the current message.
MESSAGE TAG
Each message has a 2-byte message tag which
used to categorize messages, and implement
such features as OutGoing Messages, mailboxes, and different handling of old and new messages.
The tag is created during the R (Record) command. Use the GMT (Get Message Tag) and SMT
(Set Message Tag) commands to handle message tags.
NOTE
Message tag bits can only be cleared and
are set only when a message is first created. This limitation, inherent in Flash
memories, allows bits to be changed only
from 1 to 0 (changing bits from 0 to 1
requires a special erasure procedure).
However, the usual reason for updating an
existing tag is to mark a message as old. This
can be done when a message is first created by using one of the bits as a new/old
indicator, setting the bit to 1 and later
clearing it when necessary.
The PA (Pause) and RES (Resume) commands
suspend the P and R commands, respectively,
and then resume them from where they were
suspended.
ISD
2-3
ISD-T360SB
2.1.5
TONE GENERATION
The VoiceDSP processor generates DTMF tones
and single-frequency tones from 300Hz to 3000Hz
in increments of 100Hz. The ISD-T360SB tone generation conforms to the EIA-470-RS standard.
Note, however, that value of some tunable parameters may need adjusting to meet the standard specifications since the energy level of
generated tones depends on the analog circuits
used.
1.
2.
3.
Tune the DTMF_GEN_TWIST_LEVEL parameter to control the twist level of the generated DTMF tones.
Use the VC (Volume Control) command,
and tune the TONE_GEN_LEVEL parameter, to control the energy level at which
these tones are generated.
Use the GT (Generate Tone) command to
specify the DTMF tones, and the frequency at which single tones are generated.
Refer to table 2-5, VC command and GT command of the Command Description section for
furhter details of the relevant tunable parameters and commands.
NOTE
2-4
The DTMF detector performance is
degraded during tone generation, especially if the frequency of the generated
tone is close to the frequency of one of the
DTMF tones.
2—SOFTWARE
2.1.6
INITIALIZATION AND CONFIGURATION
Use the following procedures to initialize the
VoiceDSP processor:
NORMAL INITIALIZATION
Reset the VoiceDSP processor by activating the
RESET signal. (See “RESETTING” on page 1-3.)
1.
Issue a CFG (Configure VoiceDSP processor) command to change the configuration according to your environment.
2.
Issue an INIT (Initialize System) command
to initialize the VoiceDSP firmware.
3.
Issue a series of TUNE commands to adjust
the VoiceDSP processor to the requirements of your system.
TUNABLE PARAMETERS
The VoiceDSP processor can be adjusted to the
specific system’s requirements using a set of tunable parameters. These parameters are set to
their default values after reset and can be later
modified with the TUNE command. By tuning
these parameters, you can control various aspects of the VoiceDSP processor’s operation,
such as silence compression, tone detection,
and no-energy detection.
Tables 2-4 to 2-11 of the Command Description
section describe all the tunable parameters in
detail.
Voice Solutions in Silicon™
ISD-T360SB
2—SOFTWARE
2.1.7
POWER-DOWN MODE
The PDM (Go To Power-Down Mode) command
switches the ISD-T360SB to power-down mode.
The purpose of the PDM command is to save
power during buttery operation, or for any other
power saving cause. During power-down mode
only basic functions, such as ARAM/DRAM refresh and time and date update, are active (for
more details refer to POWER-DOWN MODE description on page 1-4).
This PDM command may only be issued when
the processor is in the IDLE mode (for an explanation of the ISD-T360SB states, see “Command
Execution” on page 2–2). If it is necessary to
switch to power-down mode from any other
state, the controller must first issue a S (Stop)
command to switch the processor to the IDLE
state, and then issue the PDM command. Sending any command while in power-down mode
resets the VoiceDSP processor detectors, and returns it to normal operation mode.
NOTE
2.2
Entering or exiting power-down mode can
distort the real-time clock by up to 500 µs.
Thus, to maintain the accuracy of the realtime clock, enter or exit the power-down
mode as infrequently as possible.
PERIPHERALS
This section provides details of the peripherals interface support functions and their principle operation. It is divided into the following subjects:
• Microcontroller Interface (Slave
MICROWIRE)
• Memory Interface
• Codec Interface
ISD
2.2.1
MICROCONTROLLER INTERFACE
MICROWIRE/PLUS™ is a synchronous serial communication protocol minimizes the number of
connections, and thus the cost, of communicating with peripherals.
The VoiceDSP MICROWIRE interface implements
the MICROWIRE/PLUS interface in slave mode,
with an additional ready signal. It enables a microcontroller to interface efficiently with the
VoiceDSP processor application.
The microcontroller is the protocol master and
provides the clock for the protocol. The VoiceDSP processor supports clock rates of up to 400
KHz. This transfer rate refers to the bit transfer; the
actual throughput is slower due to byte processing by the VoiceDSP processor and the microcontroller.
Communication is handled in bursts of eight bits
(one byte). In each burst the VoiceDSP processor is able to receive and transmit eight bits of
data. After eight bits have been transferred, an
internal interrupt is issued for the VoiceDSP processor to process the byte, or to prepare another
byte for sending. In parallel, the VoiceDSP processor sets MWRDY to 1, to signal the microcontroller that it is busy with the byte processing.
Another byte can be transferred only when the
MWRDY signal is cleared to 0 by the VoiceDSP
processor. When the VoiceDSP processor transmits data, it expects to receive the value 0xAA
before each transmitted byte. The VoiceDSP
processor reports any status change by clearing
the MWRQST signal to 0.
If processor command’s parameter is larger than
one byte, the microcontroller transmits the Most
Significant Byte (MSB) first. If a return value is larger than one byte, the VoiceDSP processor transmits the MSB first.
The following signals are used for the interface
protocol. Input and output are relative to the
VoiceDSP processor.
2-5
ISD-T360SB
INPUT SIGNALS
MWDIN
MICROWIRE Data In. Used for input only, for
transferring data from the microcontroller to the
VoiceDSP processor.
MWCLK
MICROWIRE Clock. Serves as the synchronization
clock during communication. One bit of data is
transferred on every clock cycle. The input data
is available on MWDIN and is latched on the
clock rising edge. The transmitted data is output
on MWDOUT on the clock falling edge. The signal should remain low when switching MWCS.
MWCS
MICROWIRE Chip Select. The MWCS signal is
cleared to 0, to indicate that the VoiceDSP processor is being accessed. Setting MWCS to 1
causes the VoiceDSP processor to start driving
MWDOUT with bit 7 of the transmitted value. Setting the MWCS signal resets the transfer-bit
counter of the protocol, so the signal can be
used to synchronize between the VoiceDSP processor and the microcontroller.
To prevent false detection of access to the
VoiceDSP processor due to spikes on the MWCLK
signal, use this chip select signal, and toggle the
MWCLK input signal, only when the VoiceDSP
processor is accessed.
OUTPUT SIGNALS
MWDOUT
MICROWIRE Data Out. Used for output only, for
transferring data from the VoiceDSP processor to
the microcontroller. When the VoiceDSP processor receives data it is echoed back to the microcontroller on this signal, unless the received data
is 0xAA. In this case, the VoiceDSP processor echoes a command’s return value.
2-6
2—SOFTWARE
MWRDY
MICROWIRE Ready. When active (0), this signal
indicates that the VoiceDSP processor is ready to
transfer (receive or transmit) another byte of data.
This signal is set to 1 by the VoiceDSP processor
after each byte transfer has been completed. It
remains 1, while the VoiceDSP processor is busy
reading the byte, writing the next byte, or executing the received command (after the last parameter has been received). MWRDY is cleared
to 0 after reset. For proper operation after a
hardware reset, this signal should be pulled up.
MWRQST
MICROWIRE Request. When active (0), this signal
indicates that new status information is available. MWRQST is deactivated (set to 1), after the
VoiceDSP processor receives a GSW (Get Status
Word) command from the microcontroller. After
reset, this signal is active (0) to indicate that a reset occurred. MWRQST, unlike all the signals of
the communication protocol, is an asynchronous line that is controlled by the VoiceDSP firmware.
SIGNAL USE IN THE INTERFACE PROTOCOL
After reset, both MWRQST and MWRDY are
cleared to 0.
The MWRQST signal is activated to indicate that
a reset occurred. The EV_RESET bit in the status
register is used to indicate a reset condition.
The GSW command should be issued after reset
to verify that the EV_RESET event occurred, and
to deactivate the MWRQST signal.
While the MWCS signal is active (0), the VoiceDSP processor reads data from MWDIN on every
rising edge of MWCLK. VoiceDSP processor also
writes every bit back to MWDOUT. This bit is either
the same bit which was read from MWDIN (in this
case it is written back as a synchronization echo
after some propagation delay), or it is a bit of a
value the VoiceDSP processor transmits to the
microcontroller (in this case it is written on every
falling edge of the clock).
Voice Solutions in Silicon™
ISD-T360SB
2—SOFTWARE
When a command has more than one parameter/return-value, the parameters/return-values
are transmitted in the order of appearance. If a
parameter/return-value is more than one byte
long, the bytes are transmitted from the most significant to the least significant.
Figure 1-32 and Figure 1-33 illustrate the sequence of activities during a MICROWIRE data
transfer between VoiceDSP and the microcontroller.
The MWRDY signal is used as follows:
INTERFACE PROTOCOL TIME-OUTS
1.
Active (0) MWRDY signals the microcontroller that the last eight bits of data transferred to/from the voice module were
accepted and processed (see below).
2.
The MWRDY signal is deactivated (set to 1
by the VoiceDSP processor) after 8-bits of
data were transferred to/from the
VoiceDSP processor. The bit is set following the falling edge of the eighth MWCLK
clock-cycle.
3.
4.
5.
The MWRDY signal is activated (cleared to
0) by the VoiceDSP processor when it is
ready to receive the first parameter byte
(if there are any parameters) and so on till
the last byte of parameters is transferred.
An active MWRDY signal after the last
byte of parameters indicates that the
command was parsed and (if possible)
executed. If that command has a return
value, the microcontroller must read the
value before issuing a new command.
When a return value is transmitted, the
MWRDY signal is deactivated after every
byte, and activated again when the
VoiceDSP processor is ready to send another byte, or to receive a new command.
The MWRDY signal is activated (cleared to
0) after reset, and after a protocol timeout. (See “INTERFACE PROTOCOL TIMEOUTS” )
The MWRQST signal is used as follows:
1.
The MWRQST signal is activated (cleared
to 0), when the status word is changed.
2.
The MWRQST signal remains active (0), until the VoiceDSP processor receives a GSW
command.
ISD
Depending on the VoiceDSP processor’s state, if
more than 100 milliseconds elapse between the
assertion of the MWRDY signal and the transmission 8th bit of the next byte pertaining to the
same command transaction, a time-out event
occurs, and the VoiceDSP processor responds as
follows:
1.
Sets the error bit in the status word to 1.
2.
Sets the EV_TIMEOUT bit in the error word
to 1.
3.
Activates the MWRQST signal (clears it to
0).
4.
Activates the MWRDY signal (clears it to
0).
5.
Waits for a new command. (After a timeout occurs, i.e., the microcontroller received MWRQST during the command
transfer, or result reception, the microcontroller must wait at least four milliseconds
before issuing the next command.)
ECHO MECHANISM
The VoiceDSP processor echoes back to the microcontroller all the bits received by the VoiceDSP processor. Upon detection of an error in the
echo, the microcontroller should stop the protocol clock, which eventually causes a time-out error (i.e., ERR_TIMEOUT bit is set in the error word).
NOTE
When a command has a return value, the
VoiceDSP processor transmits bytes of the
return value instead of the echo value.
The VoiceDSP processor transmits a byte as an
echo when it receives the value 0xAA from the
microprocessor. Upon detection of an error the
VoiceDSP processor activates the MWRQST signal, and sets the ERR_COMM bit in the error
word.
2-7
ISD-T360SB
2.2.2
MEMORY INTERFACE
DEVICE NUMBER AND TYPE
The VoiceDSP processor supports various types
of Flash memory and ARAM/DRAM devices. Up
to four devices may be connected to the
VoiceDSP, where all the connected devices
must be of the same type. Each memory device
may be of 4Mbit, 8Mbit or 16Mbit; thus a total of
64Mbit non-volatile memory may be connected
for message storage (up to 4 hours of voice recording).
See “MEMORY INTERFACE” on page 1-6, for detailed description of the supported Flash and
ARAM/DRAM devices and the hardware connectivity.
Use the CFG command to define the type and
number of installed memory devices (see “CFG
Configure VoiceDSP config_value” on page 225).
MEMORY DEVICE SIZE
The memory manager handles the memory devices in basic units of 4Kbyts blocks. This approach is defined due to the nature of Flash
devices where the basic unit that can be erased
is a 4Kbytes block. This constraint is not relevant
for ARAM/DRAM devices, but the concept is
maintained for simplicity and consistency.
Memory blocks cannot be shared by different
voice messages. Therefore, the maximum number of messages per memory device, equals to
the number of memory blocks minus one (one
block per device is used for memory management).
2—SOFTWARE
PRODUCTION LINE TESTING
In many cases it is desired to test the ISD-T360SB
in the production line as part of the whole application. Usually in these cases, the testing time is
an important factor and should be minimized as
possible. The initialization time of the memory devices is significant and should be avoided during
production (Refer to Table 1-4). Therefore, a
dedicated parameter is defined in order to allow
a production line testing while using a small part
of the real connected memory size.
It should be noted that in case of power failure
during the production line testing, the connected memory devices should be replaced, and
the process should be repeated. Refer to parameter index 63, in Table 2-10, for further explanation of the production line testing.
ARAM QUALITY
ARAM is an Audio Grade RAM device, which implies that some percentage of the ARAM bits are
defected and their content is undefined. Unlike
Flash devices, where the defected bits can be
mapped out, in case of ARAM specific bits cannot be mapped out; only memory blocks can be
mapped out.
Therefore, it should be noted that using ARAM as
a voice storage device, will result in audible distortions. It is the user responsibility to define the
maximum allowed bad nibbles (4 bits) in a memory block. If the number of bad nibbles exceeds
the defined limitation, the specific block is
mapped out and is not used for message recording. Refer to tunable parameter index 64, in
Table 2-10, for further details of the ARAM quality
level definition.
The size of the connected memory devices, is
defined by the number of memory blocks in
each device. Refer to tunable parameter index
62, in Table 2-10, for detailed description of the
available number of blocks for Flash and ARAM/
DRAM devices.
2-8
Voice Solutions in Silicon™
ISD-T360SB
2—SOFTWARE
2.2.3
CODEC INTERFACE
SUPPORTED FUNCTIONALITY
The VoiceDSP processor supports analog and
digital telephony in various configurations. For
analog telephony the VoiceDSP operates in
master mode, where it provides the clock and
the synchronization signals. It supports a list of single channel and dual channel codecs, as listed
in Table 1-7. For digital telephony the VoiceDSP
operates in slave mode, where the control signals are provided by an external source.
The codec interface is designed to exchange
data in short frame format as well as in long
frame format. The channel width may be either
8 bits (u-Law format or A-Law format), or 16 bits
(linear format). In slave mode the clock may be
divided by two, if required (two bit rate clock
mode).
DATA CHANNELS TIMING
Especially in digital telephony, but also in analog
telephony when speakerphone is connected,
the channels data may be delayed from the
synchronization signal by variable number of
clock cycles. In order to allow full flexibility of the
data delay relative to the synchronization signal,
and the delay between the two synchronization
signals, a set of registers is provided. setting the
delay parameters of these registers defines the
exact timing of all the codec interface signals.
Refer to tunable parameters index 65 to index
69, in Table 2-11, for detailed description of the
delay registers and their significance.
2.3
ALGORITHM FEATURES
The VoiceDSP support up to 2 voice channels,
where the line should be connected as channel
0 (in master mode or in slave mode - depends on
the configuration), and the speakerphone
(speaker and microphone) should be connected as channel 1 or as channel 2, depends on the
configuration (channel 1 and channel 2 are always connected as master).
This section provides details of the VoiceDSP algorithms and their principle operation. It is divided into the following subjects:
See “The Codec Interface” on page 1-13, for detailed description of the supported codec devices and the hardware connectivity.
• Speakerphone
• VCD (Voice Compression and
Decompression)
• DTMF Detection
• Tone and Energy Detection (Call Progress)
• Speech Synthesis
Use the CFG command to define the codec
mode (master or slave), the data frame format
(short or long), the channel width (8 bits or 16
bits), the clock bit rate (single or dual) and the
number and type of codecs (one or two, single
channel or dual channel). See “CFG Configure
VoiceDSP config_value” on page 2-25.
ISD
2-9
ISD-T360SB
2.3.1
VCD (VOICE COMPRESSION AND
DECOMPRESSION)
The VoiceDSP processor implements a state of
the art VCD algorithm of the CELP family. The algorithm provides 3 compression rates that can
be selected dynamically (actually, the algorithm
supports more compression rates). PCM recording (no compression) is also provided.
The lowest compression rate of 5.3 Kbit/s enables
about 30 minutes of recording on an 8-Mbit device (depending on the relative silence period).
The mid-quality compression rate of 9.9 Kbit/s
provides about 16 minutes of voice recording
time. The highest compression rate of 16.8 Kbit/s,
the highest quality recording, stores up to 10 minutes on a 8-Mbit device. For detailed information
about recording times refer to table 1-5.
Before recording each message, the microcontroller selects one of the three compression rates,
or PCM recording, with the compression_rate
parameter of the R (Record) command. During
message playback the VoiceDSP processor
reads this one byte parameter and selects the
appropriate speech decompression algorithm.
IVS vocabularies can be prepared in either of
the three compression rates, or in PCM format,
using the IVS tool. All messages in a single vocabulary must be recorded using the same algorithm. (See the IVS User’s Guide for more details).
During speech synthesis, the VoiceDSP processor
automatically selects the appropriate speech
decompression algorithm.
SILENCE COMPRESSION
A Voice Activity Detector (VAD) is used in order
to detect periods of silence during the compression of the recorded message. Silence is treated
differently than normal voice by the compression algorithm. It is compressed to about 1.0 Kbit/
s. The compressed silence contains data that allows to generate comfort noise during message
playback. The comfort noise generation is important because the human ear is not used to “real”
silence while listening to messages.
Various tunable parameters are available in order to optimally tune the VAD. The silence com-
2-10
2—SOFTWARE
pression may be turned Off, though it is planned
to remain On continuously. For more details refer
to table 2-4 of the Command Description section.
NOTE
The silence compression should be turned
Off when ARAM devices are used for voice
storage. Otherwise, unpredictable results
are expected during message playback.
SW AGC
A SoftWare Automatic Gain Control (SW AGC)
algorithm is activated with the compression
module in order to regulate the input signal to a
dynamic range that will provide higher compression quality. The algorithm senses the energy level and updates the signal gain in order to amplify
low energy signals and to avoid signal saturation. The SW AGC feature eliminates the need for
an external HW AGC, thus reducing hardware
costs and complexity. Hardware Gain Control
may be used to avoid signal saturation prior to
sampling the signal.
A tunable parameter determines the maximum
allowed gain for the SW AGC algorithm. The SW
AGC may be turned Off, though it is planned to
remain On continuously. For more details refer to
table 2-4 of the Command Description section.
VARIABLE SPEED PLAYBACK
This feature increases or decreases the speed of
messages and synthesized messages during
playback. Use the SPS (Set Playback Speed) to
set the speed of message playback. The new
speed applies to all recorded messages and synthesized messages (only if synthesized using IVS),
until changed by another SPS command. If this
command is issued while the VoiceDSP processor is in the PLAY state, the speed also changes
for the message currently being played.
The speedup / slowdown algorithm is designed
to maintain the pitch of the original speech. This
approach provides the same speech tone while
playback speed varies.
Voice Solutions in Silicon™
ISD-T360SB
2—SOFTWARE
PCM RECORDING
The VoiceDSP is capable of recording data in
PCM format (that is the original samples format
either in 8 bits u-Law format, 8 bit A-law format or
16 bits linear format). The PCM data uses more
storage space, but it provides the highest quality
for OGM, music-on-hold or IVS data. The PCM recording may be selected as one of the available
compression rates during the R command
(compression_rate = 0).
Silence Compression and variable Speed Playback are not feasible during PCM recording and
playback since this feature skips the compression algorithm.
2.3.2
active throughout the operation of the VoiceDSP processor. Detection can be configured using
the SDET (Set Detectors Mask) command, which
controls the reporting of the occurrence of
tones, and the RDET (Reset Detectors) command which resets the detectors. The accuracy
of the tone length, as reported by the tone detectors, is ±10 ms.
DTMF detection may be reported at the starting
point, ending point, or both. The report is made
through the status word (for further details, see
GSW command).
For further details about tunable parameters refer to table 2-6 of the Command description section.
The DTMF detector performance, as measured
on the line input using an ISD-DS360-DAA board,
is summarized below (see Table 2-1).
DTMF DETECTION
The VoiceDSP processor detects DTMF, which
enables remote control operations. Detection is
Table 2-1: DTMF Detector Performance1
Play/IVS Synthesis
Record/Idle
Detection Sensitivity
Performance depends on the message being
played.2
−34 dBm
Accepted DTMF Length3
>50 ms
>40 ms
Frequency Tolerance
±1.5%
±1.5%
S/N Ratio
12 dB
12 dB
>50 ms
>45 ms
8 dB
8 dB
4 dB or 8 dB
4 dB or 8 dB
Minimum
Spacing4
Normal Twist
Reverse
1.
2.
3.
4.
5.
6.
ISD
Twist5
Performance depends on the DAA design. For reliable DTMF detection:
- A hardware echo-canceler, that attenuates the echo by at least 6 dBm, is required during playback.
- The HW AGC, if present, must be disabled during playback.
Performance with echo canceler is 10 dB better than without echo canceler. For a silent message, Detection
sensitivity is −34 dBm, with echo canceler.
Tune parameters 60 and 61 may improve DTMF detection sensitivity. for more details refer to the parameters
description in Table 2-6.
The accuracy of reported DTMF tones is ±10 ms.
If the interval between two consecutive identical DTMF tones is less than, or equal to, 20 ms, the two are detected
as one long DTMF tone. If the interval between two consecutive identical DTMF tones is between 20 ms and 45 ms,
separate detection is unpredictable.
Determined by the DTMF_REV_TWIST tunable parameter value.
2-11
ISD-T360SB
DTMF SW AGC
In order to remove the linkage between the HW
AGC and the detection level of the DTMF detector, two new tunable parameters are added.
These tunable parameters define the gain of the
SW AGC for DTMF signals.
DTMF_DET_AGC_IDLE - SW AGC for DTMF detection in Idle and Record states. When incrementing this tunable by 1, the dynamic range is
increased by 3 dB.
DTMF_DET_AGC_PLAY - SW AGC for DTMF detection in Play and Tone_Generate states. When incrementing this tunable by 1, the dynamic range
is increased by 3 dB.
2—SOFTWARE
2.3.3
TONE AND ENERGY DETECTION (CALL
PROGRESS)
The VoiceDSP processor detects busy and dial
tones, constant energy level, and no-energy
(VOX). This enables call progress tracking. Detection is active throughout the operation of the
VoiceDSP processor. Detection can be configured using the SDET (Set Detectors Mask) command, which controls the reporting of the
occurrence of tones, and the RDET (Reset Detectors) command which resets the detectors.
The accuracy of the tone length, as reported by
the tone detectors, is ±10 ms.
TUNABLE PARAMETERS
ECHO CANCELLATION
Echo cancellation is a technique used to improve the performance of DTMF detection during speech synthesis, tone generation, and
OGM playback. For echo cancellation to work
properly, HW AGC must not be active in parallel.
Thus, to take advantage of echo cancellation,
the microcontroller must control the HW AGC, if
exists, (i.e., disable the HW AGC during PLAY,
SYNTHESIS and TONE_GENERATE states and enable it again afterwards). If HW AGC can not be
disabled, do not use echo cancellation.
Tunable parameters control the detection of
busy and dial tones, constant energy level (in
the frequency range 200–3400Hz), and no-energy. These parameters should be tuned to fit the
system hardware. In addition, changes may be
required to the tunable parameters according
to the setting (On or Off) of the HW Automatic
Gain Control (HW AGC), if exists. For more information refer to tables 2-7, 2-8 of the Command
Description section.
The microcontroller should use the CFG command to activate/deactivate echo cancellation.
NOTE
2-12
Normally, a HW AGC is not required with
The ISD-T360SB, since SW AGC is active for
the VCD algorithm, DTMF detection and
the speakerphone module.
Voice Solutions in Silicon™
ISD-T360SB
2—SOFTWARE
Figure 2-1: Busy and Dial-Tone Band-Pass Filter Frequency Response
0
Magnitude dB
–10
–20
–30
–40
0
200
400
600
800
1000
1200
1400
1600
1800
2000
Frequency (Hz)
BUSY AND DIAL TONES
termined by the BUSY_DET_TONE_TYPE
tunable parameter.
Busy and dial-tone detectors work with a bandpass filter that limits the frequency range in
which tones can be detected to 0–1100Hz.
Figure 1-1 shows the frequency response of this
band-pass filter.
BUSY_DET_TONE_TYPE specifies the type of
cadences that are supported.
Legal values are:
The design of the busy-tone detector allows very
high flexibility in detecting busy tones with varying cadences.
Two cadences only
Three cadences only
Both two and three cadences.
The tunable parameters are divided into five
sets:
The acceptance criteria for two cadences:
1.
2.
Busy Tone On-time and Off-time Range
Specification:
[E1–E3] < BUSY_DET_DIFF_THRESHOLD
and
[S1–S3] < BUSY_DET_DIFF_THRESHOLD
BUSY_DET_MIN_ON_TIME
BUSY_DET_MIN_OFF_TIME
BUSY_DET_MAX_ON_TIME
BUSY_DET_MAX_OFF_TIME
The acceptance
cadences:
BUSY_DET_VERIFY_COUNT determines the
number of On/Off cadences that detector should detect before reporting busy
tone presence.
for
three
[E1–E4] < BUSY_DET_DIFF_THRESHOLD
and
[S1–S4] < BUSY_DET_DIFF_THRESHOLD
Busy Tone Cadence Control Specification
BUSY_DET_VERIFY_COUNT
BUSY_DET_TONE_TYPE
BUSY_DET_DIFF_THRESHOLD
criteria
3.
Busy and Dial Tone Energy Thresholds
TONE_DET_ON_ENERGY THRESHOLD
TONE_DET_OFF_ENERGY THRESHOLD
4.
Busy Detection Time
BUSY_DET_MIN_TIME
BUSY_DET_DIFF_THRESHOLD describes the
maximum allowed difference between
two compared On or Off periods, as de-
ISD
2-13
ISD-T360SB
2—SOFTWARE
Figure 2-2: Busy-Tone Detector—Default Cadence Specification
E1
E2
E3
S1
[E1
S2
S3
– E3] < 100 ms [S1 – S3] < 100 ms 100 < Ei < 1680 ms 70 < Si < 1220 ms
CONSTANT ENERGY
2.3.4
The constant-energy detector reports the presence of constant energy in the range 200Hz to
3400Hz. It is intended to detect both white and
pink noise and can be used to detect line disconnection during recording.
The speakerphone feature lets the user communicate through a telephone line, using the unit’s
speaker and the microphone instead of its handset. The speakerphone processes signals sent
from the line to the speaker, and from the microphone to the line. It also performs the necessary
switching, attenuation and echo cancellation
on the signals present on the line/speaker.
It is recommend to use the constant energy
mechanism in conjunction with the no-energy
(VOX) mechanism.
The following tunable parameters control the
operation of the constant-energy detector:
CONST_NRG_DET_TIME_COUNT
CONST_NRG_DET_TOLERANCE_TIME
CONST_NRG_DET_LOW_THRESHOLD
CONST_NRG_DET_HIGH_THRESHOLD
NO ENERGY (VOX)
The no-energy detector reports when the energy
in the frequency range 200Hz to 3400Hz remains
below a preprogrammed threshold for a preprogrammed time-out. A programmable tolerance
is allowed.
It is recommend to use the no-energy (VOX)
mechanism in conjunction with the constant-energy mechanism.
The following tunable parameters control the
operation of the no-energy (VOX) mechanism:
VOX_DET_ENERGY_THRESHOLD
VOX_DET_TIME_COUNT
VOX_DET_TOLERANCE_TIME
2-14
FULL-DUPLEX SPEAKERPHONE
The ISD-T360SB speakerphone is simple to use; it
requires no special hardware or training for the
echo cancelers. The gain control is fully digital,
which eliminates the need for analog gain control hardware.
The speakerphone features two types of echoes,
the electrical echo (line or circuit) and the
acoustic echo. The electrical echo is a result of
an imperfect impedance match between the 4to 2-wire interface (hybrid) and the line impedance. The electrical echo, relatively short term,
has a transfer function that varies slowly. The
second echo, the acoustic echo, is a line impedance returning from the speaker to the microphone. This echo is relatively long term, and its
transfer function may vary quite quickly if
anyone, or anything, moves in the room. Both
echoes must be canceled to achieve a highquality hands-free system.
For more details of the speakerphone tunable
parameters refer to table 2-9 of the Command
Description section.
Voice Solutions in Silicon™
ISD-T360SB
2—SOFTWARE
SPEAKERPHONE TERMINOLOGY
Hold
Send Path
During Hold mode interrupts from both codecs
are stopped. Neither side can hear each other.
The signal path from the microphone (near-end
speaker) to the line (far-end listener). The microphone is the input port, and line-out is the output
port of this signal path.
Restart
The signal path from the line (far-end speaker) to
the loudspeaker (near-end listener). The line-in is
the input port, and the speaker is the output port
for this signal path.
In Restart mode the speakerphone re-initializes itself to the last speakerphone mode (full-duplex,
transparent or mute). This mode should be used
to resume the speakerphone operation after
Hold mode or when there is a significant change
in the environmental conditions (e.g., parallel
pickup) that may affect the speakerphone quality.
AEC
Transparent
Acoustic Echo Controller. The part in the speakerphone algorithm that controls the echo in the
sendpath.
While in Transparent mode, the speakerphone
works in full-duplex mode but without echo cancellation.
EEC
Samples from the microphone are transferred to
the line, and samples from the line are transferred to the speaker, with no processing. This
mode should be used only for tuning and testing
the system.
Receive Path
Electric Echo Controller. The part in the speakerphone algorithm that controls the echo in the receive path.
Listen
SPEAKERPHONE MODES OF OPERATION
Full-Duplex (ON)
The speakerphone works in full-duplex mode,
meaning both parties can speak and hear each
other simultaneously. In this mode both the
acoustic and electric echo controllers are active. The VoiceDSP processor tone detectors are
not active in this mode.
In Listen mode the line is audible on the speaker,
and the processor tone detectors are active.
During Listen mode, dialing with the GT command and call progress is possible, since the
busy and dial tone detectors are active.
The following pseudo-code demonstrates how
to make a call from speakerphone mode:
Mute
In this mode of operation, the speakerphone
generates silence to the line. The near-end listener can hear the far-end speaker but not vice versa. Tone detectors are not active.
ISD
2-15
ISD-T360SB
2—SOFTWARE
Figure 2-3: Speakerphone Pseudo Code Representation
while () {
EV = wait_event()
case EV of:
skpr_button_pressed:
if (speakerphone_on) {
SSM 0
// Put VoiceDSP in idle mode
first_digit = TRUE
deactivate_digit_timeout_event()
else
SSM 1
// Put VoiceDSP in full-duplex speakerphone mode
digit_pressed:
if (first_digit) {
SSM 4
// Enter LISTEN mode
first_digit = FALSE
}
GT <dtmf_of_digit> // Dial the digit
S
// Stop. Note that after the S command
// the VoiceDSP is still in speakerphone mode
enable_digit_timeout_event() // To "guess" when dialing is completed.
digit_timeout_event:
SSM 1
// Dialing is completed, Go back to full-duplex mode
deactivate_digit_timeout_event()
}
2.3.5
SPEECH SYNTHESIS
Speech synthesis is the technology used to create messages out of predefined words and
phrases stored in a vocabulary.
There are two kinds of predefined messages:
fixed messages (voice menus in a voice-mail system) and programmable messages (time-andday stamp, or the You have n messages announcement in a DTAD).
A vocabulary includes a set of predefined words
and phrases, needed to synthesize messages in
any language. Applications which support more
than one language require a separate vocabulary for each language.
INTERNATIONAL VOCABULARY SUPPORT (IVS)
IVS is a mechanism by which the VoiceDSP processor utilizes several vocabularies stored on an
external storage device. IVS enables the ISDT360SB to synthesize messages with the same
meaning, but in different languages, from separate vocabularies.
IVS Features
• Multiple vocabularies stored on a single
storage device.
• Plug-and-play. The same microcontroller
code is used for all languages.
• Synthesized and recorded messages use
the same voice compression algorithm to
achieve equal quality.
• Argumented sentences. (For example:
You have <n> messages.)
2-16
Voice Solutions in Silicon™
ISD-T360SB
2—SOFTWARE
• Auto-synthesized time-and-day stamp
(driven by the VoiceDSP processor’s
clock).
• Support for various language and
sentence structures:
– One versus many. (For example:
You have one message versus You
have two messages.)
– None versus many. (For example:
You have no messages versus You
have two messages.)
– Number synthesis (English—Eighty
versus French—Quatre-vingt).
– Word order (English—Twenty-one
versus German—Einundzwanzig).
– Days of the week (Monday through
Sunday versus Sunday through
Saturday).
VOCABULARY DESIGN
There are several issues, sometimes conflicting,
which must be addressed when designing a vocabulary.
Vocabulary Content
If memory space is not an issue, the vocabulary
could contain all the required sentences, each
recorded separately.
If memory space is a concern, the vocabulary
must be compact; it should contain the minimum set of words and phrases required to synthesize all the sentences. The least memory is
used when phrases and words that are common
to more than one sentence are recorded only
once, and the IVS tool is used to synthesize sentences out of them.
A good combination of sentence quality and
memory space is achieved if you take the “compact” approach, and extend it to solve pronunciation problems. For example, the word twenty
is pronounced differently when used in the sentences You have twenty messages and You
ISD
have twenty-two messages. To solve this problem, words that are pronounced differently
should be recorded more than once, each in
the correct pronunciation.
Vocabulary Recording
When recording vocabulary words, there is a
compromise between space and quality. On
one hand, the words should be recorded and
saved in a compressed form, and you would like
to use the best voice compression for that purpose. On the other hand, the higher the compression rate, the worse the voice quality.
Another issue to consider is the difference in
voice quality between synthesized and recorded messages (e.g., between time-and-day
stamp and ICMs in a DTAD environment). It is
more pleasant to the human ear to hear both
messages have the same sound quality.
Vocabulary Access
Sometimes compactness and high quality are
not enough. There should be a simple and flexible interface to access the vocabulary elements. Not just the vocabulary but the code to
access the vocabulary should be compact.
When designing for a multi-lingual environment,
there are even more issues to consider. Each vocabulary should be able to handle languagespecific structures and designed in a cooperative way with the other vocabularies so that the
code to access each vocabulary is the same.
When you use the command to synthesize the
sentence Monday. 12:30 P.M., you should not
care in what language it is going to be played
back.
IVS VOCABULARY COMPONENTS
This section describes the basic concept of an
IVS vocabulary, its components, and the relationships between them.
2-17
ISD-T360SB
Basic Concepts
An IVS vocabulary consists of words, sentences,
and special codes that control the behavior of
the algorithm which VoiceDSP processor uses to
synthesize sentences.
Word Table
The words are the basic units in the vocabulary.
Create synthesized sentences by combining
words in the vocabulary. Each word in the vocabulary is given an index which identifies it in
the word table.
Note that, depending on the language structures and sentences synthesized, you may need
to record some words more than once in the vocabulary. For example, if you synthesize the sentences: you have twenty messages and you
have twenty-five messages, the word twenty is
pronounced differently. They should, therefore,
be defined as two different words.
Number Tables
The number tables allow you to treat numbers
differently depending on the context.
Example 1: The number 1 can be announced as
one as in message number one or as first as in first
message.
2—SOFTWARE
table is to make the microcontroller that drives
the VoiceDSP processor independent of the language being synthesized. For example, if the
Flash and/or ROM memory contain vocabularies
in various languages, and the first sentence in
each vocabulary means you have n messages,
the microcontroller switches languages by issuing the following command to VoiceDSP processor:
SV <storage_media>, <vocabulary_id> -Select
a new vocabulary
The microcontroller software is thus independent
of the grammar of the language in use. The sentences consist of words, which are represented
by their indices in the vocabulary.
Sentence 0
All sentences but one are user defined. The
VoiceDSP processor treats the first sentence in
the sentence table (sentence 0) specially, to
support time-and-day stamp. The processor assumes that the sentence is designed for both system time, and message time-and-day stamp
announcement, and has one argument which is
interpreted as follows:
0
System time is announced
1
The time-and-day stamp of the current message is announced.
Example 2: The number 0 can be announced as
no as in you have no messages or as oh as in
monday, eight oh five A.M.
Example 1: When the microcontroller sends the
command: SAS 0, 0
A separate number table is required for each
particular type of use. The number table contains the indices of the words in the vocabulary
that are used to synthesize the number. Up to
nine number tables can be included in a vocabulary.
Example 2: When the microcontroller sends the
command: SAS 0, 1
The system time and day is announced.
The current message time-and-day stamp
is announced.
The following Figure 2-4 shows the interrelationship between the three types of tables.
Sentence Table
The sentence table describes the predefined
sentences in the vocabulary. The purpose of this
2-18
Voice Solutions in Silicon™
ISD-T360SB
2—SOFTWARE
Figure 2-4: The Interrelationship between the Word, the Number, and the Sentence Tables
Sentence Table
You have
OPT_NUMBER
Word Table
CONTROL_SING
MESSAGES
five
twenty
You have
messages
message
Number Table
Control and Option Codes
IVS Compiler
The list of word indices alone cannot provide the
entire range of sentences that the VoiceDSP processor is able to synthesize. IVS control and option codes send special instructions to control
the speech synthesis algorithm’s behavior in the
processor.
The IVS compiler runs on MS-DOS (version 5.0 or
later) and enables you to insert your own vocabulary, (i.e., basic words and data used to create
numbers and sentences, as directories and files
in MS-DOS). The IVS compiler then outputs a binary file containing that vocabulary. In turn, this
information can be burned into an EPROM or
Flash memory to be used by the VoiceDSP software.
For example, if the sentence should announce
the time of day, the VoiceDSP processor should
be able to substitute the current day and time in
the sentence. These control words do not represent recorded words, rather they instruct the processor to take special actions.
NOTE
The IVS data cannot be stored in EPROM
when semi-parallel Flash is used (Samsung
or Toshiba).
THE IVS TOOL
The IVS tool includes two utilities:
1.
The DOS-based IVS Compiler
2.
IVSTOOL for Windows. A Windows 3.1/95
based utility
The tools help create vocabularies for the
VoiceDSP processor. They take you from designing the vocabulary structure, through defining
the vocabulary sentences, to recording the vocabulary words.
ISD
IVS Voice Compression
Each IVS vocabulary can be compiled with either the 5.3 Kbit/s, the 9.9 Kbit/s or the 16.8Kbit/s
voice compression algorithm, or in PCM format.
Define the compression rate before compilation.
The VoiceDSP processor automatically selects
the required voice decompression algorithm
when the SV command chooses the active vocabulary.
2-19
ISD-T360SB
2—SOFTWARE
Graphical User Interface (GUI)
The IVS package includes a Windows utility to assist the vocabulary designer to synthesize sentences. With this utility, you can both compose
sentences and listen to them.
HOW TO USE THE IVS TOOL WITH THE
VOICEDSP PROCESSOR
The IVS tool creates IVS vocabularies, and stores
them as a binary file. This file is burnt into a ROM
device or programmed into a Flash memory device using the INJ (Inject IVS) command. The
VoiceDSP processor SO (Say One Word) command is used to select the required vocabulary.
The SW (Say Words), SO, SS (Say Sentence) and
SAS (Say Argumented Sentence) commands are
used to synthesize the required word or sentence. The typical vocabulary-creation process
is as follows:
1.
Design the vocabulary.
2.
Create the vocabulary files (as described
in detail below). Use VISTULA for Windows
3.1/95 to simplify this process.
3.
Record the words using any standard PC
sound card and sound editing software,
that can create .wav files.
4.
Run the IVS compiler to compress the
.wav files, and compile them and the vocabulary tables into an IVS vocabulary
file.
5.
Repeat steps 1 to 4 to create a separate
IVS vocabulary for each language that
you want to use.
6.
Burn the IVS vocabulary files into a ROM
(or Flash memory) device. Use the INJ (Inject IVS) command to program the data
into a Flash device.
NOTE
The IVS data cannot be stored in EPROM
when semi-parallel Flash is used (Samsung
or Toshiba).
Once the vocabulary is in place, the speech synthesis commands of the VoiceDSP processor can
be used to synthesize sentences.
Figure 2-5 shows the vocabulary-creation process for a single table on a ROM or Flash memory
device.
Figure 2-5: Creation of an IVS Vocabulary
.wav File
Editor
.wav Files
Compressed
Files (.vcd)
Number
Tables
PC
+
Sound
Card
IVS
Compiler
INJ
IVS Vocabulary Command
Files
Sentence
Table
IVSTOOL
for
Windows
.ini File
ROM
Programmer
Flash
ROM
Editor
2-20
Voice Solutions in Silicon™
ISD-T360SB
2—SOFTWARE
2.4
VOICEDSP PROCESSOR COMMANDS—QUICK REFERENCE TABLE
Table 2-2: Speech Commands
Command
Description
Name
S/A
Opcode
Hex
Source State
Result
State
Command Parameters
Description
Bytes
Return Value
Description
Bytes
CCIO
S
Configure
Codec I/O
34
RESET, IDLE
No change
Config_value
1
None
-
CFG
S
Configure
VoiceDSP
01
RESET
No change
Config_value
3
None
-
CMSG
S
Create
Message
33
IDLE
MSG_OPEN
Tag, Num_of_
blocks
2+2
None
-
CMT
S
Cut Message
Tail
26
IDLE
No change
Time_length
2
None
-
CVOC
S
Check
Vocabulary
2B
IDLE
No change
None
-
Test result
1
DM
S
Delete
Message
0A
IDLE
No change
None
-
None
-
DMS
S
Delete
Messages
0B
IDLE
No change
Tag_ref,
Tag_mask
2+2
None
-
GCFG
S
Get
Configuration
Value
02
RESET, IDLE
No change
None
-
Version
1
GEW
S
Get Error Word
1B
All states
No change
None
-
Error word
2
GI
S
Get Information
item
25
PLAY, RECORD,
No change
SYNTHESIS, TONE_
GENERATE, IDLE
Item
1
Item value
2
GL
S
Get Length
19
IDLE
No change
None
-
Message
length
2
GMS
S
Get Memory
Status
12
IDLE
No change
None
-
Recording
time left
2
GMT
S
Get Message
Tag
04
IDLE
No change
None
-
Message tag
2
GNM
S
Get Number of
Messages
11
IDLE
No change
Tag_ref,
Tag_mask
2+2
Number of
messages
2
GSW
S
Get Status
Word
14
All states
No change
None
-
Status word
2
GT
A
Generate Tone
0D
IDLE
TONE_
GENERATE
Tone
(single Tone or
DTMF)
1
None
-
GTD
S
Get Time and
Day
0E
IDLE
No change
Time_day_
option
1
Time and day
2
GTM
S
Get Tagged
Message
09
IDLE
No change
Tag_ref,
Tag_mask,Dir
Message
found
1
GTUNE
S
Get Tunable
Parameter
06
IDLE, RESET
No change
Index
1
Parameter_
value
2
INIT
S
Initialize System
13
RESET, IDLE
IDLE
None
-
None
-
INJ
S
Inject IVS data
29
IDLE
No change
N,
byte1...byten
4+n
None
-
MR
S
Memory Reset
2A
RESET, IDLE
No change
None
-
None
-
P
A
Playback
03
IDLE
PLAY
None
-
None
-
ISD
2+2+1
2-21
ISD-T360SB
2—SOFTWARE
Table 2-2: Speech Commands (Continued)
Command
Description
Name
S/A
Opcode
Hex
Source State
Result
State
Command Parameters
Description
Bytes
Return Value
Description
Bytes
PA
S
Pause
1C
PLAY, RECORD,
No change
SYNTHESIS,
TONE_GENERATE,
IDLE*
None
-
None
-
PDM
S
Go To PowerDown Mode
1A
IDLE
No change
None
-
None
-
R
A
Record
Message
0C
IDLE
RECORD
Tag (message
Tag),
Compression_
rate
2+1
None
-
RDET
S
Reset Detectors
2C
IDLE
No change
Detectors_
reset_mask
1
None
-
RES
S
Resume
1D
PLAY, RECORD,
No change
SYNTHESIS,
TONE_GENERATE
IDLE*
None
-
None
-
RMSG
S
Read Message
32
IDLE, MSG_OPEN MSG_OPEN
None
-
Data
32
S
S
Stop
00
All states but
RESET
IDLE
None
-
None
-
SAS
A
Say
Argumented
Sentence
1E
IDLE
SYNTHESIS
Sentence_n,
Arg
1+1
None
-
SB
S
Skip Backward
23
PLAY, IDLE*
No change
Time_length
2
None
-
SDET
S
Set Detectors
Mask
10
IDLE
No change
Detectors_
mask
1
None
-
SE
S
Skip to End of
Message
24
PLAY, IDLE*
No change
None
-
None
-
SETD
S
Set Time and
Day
0F
IDLE
No change
Time_and_
day
2
None
-
SF
S
Skip Forward
22
PLAY, IDLE*
No change
Time_length
2
None
-
SMSG
S
Set Message
Pointer
30
IDLE, MSG_OPEN MSG_OPEN
Num_of_
pages
2
None
-
SMT
S
Set Message
Tag
05
IDLE
Message_tag
2
None
-
SO
A
Say One Word
07
IDLE
SYNTHESIS
Word_number
1
None
-
SPS
S
Set Playback
Speed
16
PLAY, SYNTHESIS,
IDLE
No change
Speed
1
None
-
SS
A
Say Sentence
1F
IDLE
SYNTHESIS
Sentence_n
1
None
-
2-22
No change
Voice Solutions in Silicon™
ISD-T360SB
2—SOFTWARE
Table 2-2: Speech Commands (Continued)
Command
Description
Name
S/A
Opcode
Hex
Source State
Result
State
Command Parameters
Description
Bytes
Return Value
Description
Bytes
SV
S
Set
Vocabulary
Type
20
IDLE
No change Type, Id
1+1
None
-
SW
A
Say Words
21
IDLE
SYNTHESIS
1+N
None
-
TUNE
S
Tune
Parameters
15
IDLE, RESET
No change Index,
Parameter_
value
1+2
None
-
VC
S
Volume
Control
28
PLAY,
No change Vol_level
SYNTHESIS, IDLE,
(increment/
TONE_GENERAT
decrement)
E
1
None
-
WMSG
S
Write Message
31
IDLE,
MSG_OPEN
32
None
-
N,
word1...word
n
NOTE:
MSG_OPEN Data
* Command is valid in IDLE state, but has no effect.
S = Synchronous command
A= Asynchronous command
Table 2-3: Speakerphone Commands
Command
Description
Name S/A
Opcode
Hex
Source State
Result
State
Command Parameters
Description
Bytes
Return Value
Description
Bytes
GEW
S
Get Error Word
1B
TONE_GENERAT No
E, IDLE
change
None
-
Error word
2
GSW
S
Get Status
Word
14
TONE_GENERAT No
E, IDLE
change
None
-
Status word
2
GT
A
Generate
Tone
0D
IDLE
TONE_GE
NERATE
Tone
(Single Tone or
DTMF)
1
None
-
RDET
S
Reset
Detectors
2C
IDLE
No
change
Detectors_res
et_mask
1
None
-
S
S
Stop
00
TONE_GENERAT IDLE
E, IDLE
None
-
None
-
SDET
S
Set Detectors
Mask
10
IDLE
No
change
Detectors_
mask
1
None
-
SSM
S
Set
Speakerphon
e Mode
2F
IDLE
No
change
Mode
1
None
-
VC
S
Volume
Control
28
TONE_GENERAT No
E, IDLE
change
Vol_level
(increment/
decrement)
1
None
-
NOTE:
ISD
* Command is valid in IDLE state, but has no effect.
S = Synchronous command
A = Asynchronous command
2-23
ISD-T360SB
2.5
2—SOFTWARE
COMMAND DESCRIPTION
The commands are listed in alphabetical order.
The execution time for all commands, when specified, includes the time required for the microcontroller to retrieve the return value, where appropriate.
The execution time does not include the protocol timing overhead, i.e., the execution times are measured from the moment that the command is detected as valid until the command is fully executed.
NOTE:
Each command description includes an example application of the command. The examples show the
opcode issued by the microcontroller and the response returned by the VoiceDSP processor. For commands which require a return value from the processor, the start of the return value is indicated by a thick
vertical line.
Configure Codec I/O config_value
CCIO
Configures the voice sample paths in various states. It should be used to change the default VoiceDSP
processor configuration. It is relevant only when two codecs are used and speakerphonr is connected.
The config_value parameter is encoded as follows:
Bit 0
Loopback control.
0
Loopback disabled (default).
1
Loopback enabled. In the RECORD state, the input samples are echoed back, unchanged (i.e., no volume control), to the same codec.
Bit 1
Codec input control.
0
Input is received via the line codec (default).
1
Input is received via the speakerphone codec.
Bits 2–3
Codec output control.
2-24
00
In PLAY, IDLE, SYNTHESIS and TONE_GENERATE states, output is to both codecs. In
RECORD state, output is to the non-input codec (no volume control). If the loopback
control bit is set, output in RECORD state is to both codecs as well (default).
01
Output in all states is to the line codec.
10
Output in all states is to the speakerphone codec.
11
Output in all states is to both codecs.
Voice Solutions in Silicon™
ISD-T360SB
2—SOFTWARE
Bits 4–7
Reserved.
Example
CCIO 01
Byte sequence:
Description:
Microcontroller
VoiceDSP
Enable loopback
34
01
34
01
Configure VoiceDSP config_value
CFG
Configures the VoiceDSP processor in various hardware environments. It should be used to change
the default processor configuration.
The config_value parameter is encoded as follows:
Bits 0–3
Memory type.
0000 No Memory (default).
0001 A/DRAM.
0010 Reserved.
0011 Toshiba Serial Flash.
0100 Samsung Semi-Parallel Flash.
0101 Toshiba Semi-Parallel Flash.
0110 Reserved.
0111 Reserved.
Bits 4–5
Number of installed memory devices.
00
1 (Default)
01
2
10
3
11
4
Bit 6-14
Reserved.
Bit 15
Echo Cancellation Control (for DTMF Detection).
ISD
0
Echo cancellation off (default).
1
Echo cancellation is on during playback.
2-25
ISD-T360SB
2—SOFTWARE
Echo cancellation improves the performance of DTMF detection during playback. Echo cancellation
can be turned on only with a system that can disable HW AGC (if present) during playback. A system
featuring HW AGC, that cannot be controlled by the microcontroller (i.e., disabled or enabled), must
not turn on this bit.
Bit 16
Clock bit rate (in Slave Mode only).
0
One bit rate clock (default).
1
Two bit rate clock.
Bit 17
Codec configuration.
0
Short-frame format (default).
1
Long-frame format (guaranteed by design but not tested).
Bits 18–19
Codec type.
00
16-bit linear (default).
01
µ-Law.
10
A-Law.
Bit 20
Codec interface mode.
0
Master codec interface (default).
1
Slave codec interface.
Bits 21–22
Number and type of codecs
00
One single codec (default).
01
Two single codecs.
10
One dual codec.
11
Reserved.
The codecs should be connected as follows:
Telephone line or equivalent - always connected as channel 0.
Speaker and microphone - connected as channel 1 in case of one dual codec (not applicable in
slave mode), connected as channel 2 in case of two single codecs.
2-26
Voice Solutions in Silicon™
ISD-T360SB
2—SOFTWARE
Bit 23
Reserved.
Example
CFG 144013
Byte sequence:
Description:
CMSG
01
14
40
13
Microcontroller
01
14
40
13
VoiceDSP
Configure the VoiceDSP to work with:
Single codec in Slave Mode and A-Law compressed samples.
Data in Short Frame format and Single Bit Rate interface.
Two Serial Toshiba Flash devices.
Echo Cancellation for DTMF detectiopn is On.
Create Message tag num_of_blocks
Creates a new message with a message tag tag, allocates num_of_blocks 4-Kbytes blocks for the new
message, and sets the message pointer to the beginning of the message data. CMSG switches the
VoiceDSP processor to the MSG_OPEN state.
The memory space available for the message data is computed as follows:
(127 x num_of_blocks – 2) x 32 bytes.
Once a message is open (the processor is in the MSG_OPEN state), the message pointer can be set to
any position on a page (32 bytes) boundary within the message with the SMSG command. Modify the
message contents with the WMSG command, and read with the RMSG command.
The microcontroller must issue an S command to close the message and switch the VoiceDSP processor to the IDLE state.
If the memory is full, EV_MEMFULL is set in the status word and no message is created. If the memory is
not full but there is insufficient memory and the processor cannot allocate more memory space,
EV_MEMLOW is set in the status word and no message is created.
Example
CMSG 0101 0001
Byte sequence:
Description:
ISD
33
01
01
00
Microcontroller
01
33
01
01
00
VoiceDSP
01
Create a new message with a tag=0101, and allocate 1 block (4 Kbytes) for its data.
2-27
ISD-T360SB
2—SOFTWARE
Cut Message Tail time_length
CMT
Cut time_length units, in 10 ms segments, off the end of the current message. The maximum value of
time_length is 6550. In case of silence, cut-time accuracy is 0.1 to 0.2 seconds (depends on compression rate).
NOTE
If time_length is longer than the total duration of the message, the EV_NORMAL_END event is set in
the status word and the message becomes empty but not deleted. Use the DM (Delete Message),
or DMS (Delete Messages), command to delete the message.
A compressed frame represents 21 ms of speech, thus the minimum meaningful parameter is 3, (i.e.,
a 30 ms cut).
CMT 1 or CMT 2 have no effect.The CMT command can not be used on data messages
Example
CMT 02BC
Byte sequence:
Description:
CVOC
Microcontroller
VoiceDSP
26
02
BC
26
02
BC
Cut the last seven seconds of the current message.
Check Vocabulary
Checks (checksum) if the IVS data was correctly programmed to the ROM or Flash device.
If the vocabulary data is correct the return value is 1. Otherwise the return value is 0. If the current vocabulary is undefined, ERR_INVALID is reported.
Example
CVOC
Byte sequence:
Microcontroller
2B
AA
2B
01
Description:
VoiceDSP
Check the current vocabulary.
The VoiceDSP processor responds that the vocabulary is OK.
DM
Delete Message
Deletes the current message. Deleting a message clears its message tag.
Deleting the current message does not cause a different message to become current. The current
message is undefined. If, for example, you issue the GTM command to skip to the next message, the
first message that is newer than the just deleted message is selected as the current message.
The memory space released by the deleted message is immediately available for recording new messages.
2-28
Voice Solutions in Silicon™
ISD-T360SB
2—SOFTWARE
Example
DM
Byte sequence:
Description:
Microcontroller
VoiceDSP
0A
0A
Delete current message.
Delete Messages tag_ref tag_mask
DMS
Deletes all messages whose message tags match the tag_ref parameter. Only bits set in tag_mask are
compared i.e., a match is considered successful if:
message tag and tag_mask = tag_ref and tag_mask
where and is a bitwise AND operation.
After the command completes execution, the current message is undefined. Use the GTM command
to select a message to be the current message.
The memory space released by the deleted message is immediately available for recording new messages.
Example
DMS FFC2 003F
Byte sequence:
Description:
Microcontroller
VoiceDSP
0B
FF
C2
00
3F
0B
FF
C2
00
3F
Delete all old incoming messages from mailbox Number 2 in a system where the
message tag is encoded as follows:
Bits 0–2: mailbox ID
8 mailboxes indexed: 0 to 7
Bit 3: new/old message indicator
0—Message is old
1—Message is new
Bits 4–5: message type
00—ICM/memo
01—OGM
10—Call transfer message
Bits 6–15: not used
Note: the description of the tag is an example only. All bits of the tag are user-definable.
GCFG
Get Configuration Value
Returns a sequence of one byte with the following information:
Bits 0–7
Magic number, which specifies the VoiceDSP firmware version.
ISD
2-29
ISD-T360SB
2—SOFTWARE
Example
GCFG
Byte sequence:
Microcontroller
02
AA
01
Description:
VoiceDSP
Get the VoiceDSP processor magic number.
The VoiceDSP processor responds that it is Version 1.
02
GEW
Get Error Word
Returns the 2-byte error word.
ERROR WORD
The 16-bit error word indicates errors that occurred during execution of the last command. If an error
is detected, the command is not processed; the EV_ERROR bit in the status word is set to 1, and the
MWRQST signal is activated (set to 0).
The GEW command reads the error word. The error word is cleared during reset and after execution
of the GEW command.
If errors ERR_COMMAND or ERR_PARAM occur during the execution of a command that has a return
value, the return value is undefined. The microcontroller must still read the return value, to ensure proper synchronization.
15
9
Res
8
7
6
5
4
3
2
1
0
Res
ERR_
INVALID
ERR_
TIMEOUT
ERR_
COMM
Res
ERR_
PARAM
ERR_
COMMAND
ERR_
OPCODE
Res
The bits of the error word are used as follows:
ERR_OPCODE
Illegal opcode. The VoiceDSP processor does not recognize the opcode.
ERR_COMMAND
Illegal command sequence. The command is not legal in the current state.
ERR_PARAM
Illegal parameter. The value of the parameter is out of range, or is not appropriate for the command.
ERR_COMM
Microcontroller MICROWIRE communication error.
2-30
Voice Solutions in Silicon™
ISD-T360SB
2—SOFTWARE
ERR_TIMEOUT
Time-out error. Depending on the VoiceDSP processor’s state, more than 100 milliseconds elapsed between the arrival of two consecutive bytes (for commands that have parameters).
ERR_INVALID
Command can not be performed in current context.
Example
GEW
Byte sequence:
Description:
1B
AA
AA
Microcontroller
1B
00
02
VoiceDSP
Get the VoiceDSP processor error word (typically sent after GSW when EV_ERROR is
reported in the status word).
The VoiceDSP processor responds: ERR_OPCODE:
Get Information item
GI
Returns the 16-bit value specified by item from one of the internal registers of the VoiceDSP processor.
item may be one of the following:
0
The duration of the last detected DTMF tone, in 10 ms units. The return value is meaningful
only if DTMF detection is enabled, and the status word shows that a DTMF tone was detected.
1
The duration of the last detected busy tone in 10 ms units.
2
The energy level of the samples in the last 10 ms.
3
The energy level of the samples, in the last 10 ms, that are in the frequency range described in Figure 2-1. The return value is meaningful only if one of the tone detectors is
enabled (bits 0,1 of the detectors mask; see the description of SDET command).
The return value is unpredictable for any other value of item.
Example
GI 0
Byte sequence:
Description:
ISD
Microcontroller
25
VoiceDSP
25
Get the duration of the last detected DTMF tone.
The VoiceDSP processor responds: 60 ms.
00
AA
AA
00
00
06
2-31
ISD-T360SB
GL
2—SOFTWARE
Get Length
Returns the length of the current message in multiples of 4 Kbytes (blocks).
The returned value includes the message directory information (64 bytes for the first block and 32bytes
for every other block), the message data, and the entire last block of the message, even if the message occupies only a portion of the last block. Since a memory block includes 4096 bytes, the returned
length may be bigger than the actual message length by up to 4095 bytes. The minimum length of a
message is one block.
Example
GL
Byte sequence:
Description:
Microcontroller
VoiceDSP
19
AA
AA
19
00
04
Get the length of the current message.
The VoiceDSP processor responds:
4
i.e., the message occupies 16384 (4 * 4096) bytes.
GMS
Get Memory Status
Returns the total remaining memory blocks as a 16bit unsigned integer. The estimated remaining recording time may be calculated as follows:
Time = (Num_of_blocks x 4096 x 8) / ( Compression_rate x 1000)
This estimate assumes no silence compression: a real recording may be longer, according to the
amount of silence detected and compressed.
Example
GMS
Byte sequence:
Description:
GMT
Microcontroller
12
AA
AA
VoiceDSP
Return the remaining memory blocks.
The VoiceDSP responds:
40 blocks.
12
00
28
Get Message Tag
Returns the 16-bit tag associated with the current message. If the current message is undefined,
ERR_VALID is reported.
2-32
Voice Solutions in Silicon™
ISD-T360SB
2—SOFTWARE
Example
GMT
Byte sequence:
Description:
Microcontroller
VoiceDSP
04
AA
AA
04
00
0E
Get the current message tag.
In a system where the message tag is encoded as described in the DMS command, the
VoiceDSP processor return value indicates that the message is a new ICM in mailbox
Number 6.
Get Number of Messages tag_ref tag_mask
GNM
Returns the number of messages whose message tags match the tag_ref parameter. Only bits set in
tag_mask are compared, a match is considered successful if:
message tag and tag_mask = tag_ref and tag_mask
where and is a bitwise AND operation.
The tag_ref and tag_mask parameters are each two bytes; the return value is also two bytes long.
See “Message Tag” on page 2-3 for a description of message-tag encoding. If tag_mask = 0, the total
number of all existing messages is returned, regardless of the tag_ref value.
Example
GNM FFFE 0003
Byte sequence:
Microcontroller
11
FF
FE
00
03
AA
AA
05
VoiceDSP
Get the number of messages which have bit 0 cleared, and bit 1 set, in their message
tags.
VoiceDSP processor responds that there are five messages which satisfy the request.
11
Description:
GSW
FF
FE
00
03
00
Get Status Word
Returns the 2-byte status word.
STATUS WORD
The VoiceDSP processor has a 16-bit status word to indicate events that occur during normal operation. The VoiceDSP processor asserts the MWRQST signal (clears to 0), to indicate a change in the status
word. This signal remains active until the VoiceDSP processor receives a GSW command.
The status word is cleared during reset, and upon a successful GSW command.
15
14
13
12
11
10
9
8
7
6
5
4
EV_
DTMF
EV_
RESET
EV_
VOX
EV_
CONST_
NRG
Res
EV_
MEMLOW
EV_
DIALTONE
EV_
BUSY
EV_
ERROR
EV_
MEMFULL
EV_
NORMAL_
END
EV_
DTMF_
END
ISD
3
0
EV_
DTMF_
DIGIT
2-33
ISD-T360SB
2—SOFTWARE
The bits in the status word are used as follows:
EV_DTMF_DIGIT
DTMF digit. A value indicating a detected DTMF digit. (See the description of DTMF code in the GT
command.)
EV_DTMF_END
1 = Ended detection of a DTMF tone. The detected digit is held in EV_DTMF_DIGIT.
EV_NORMAL_END
1 = Normal completion of operation, e.g., end of message playback.
EV_MEMFULL
1 = Memory is full.
EV_ERROR
1 = Error detected in the last command. You must issue the GEW command to return the error code
and clear the error condition.
EV_BUSY
1 = Busy tone detected. Use this indicator for call progress and line disconnection.
EV_DIALTONE
1 = Dial tone detected. Use this indicator for call progress and line disconnection.
EV_MEMLOW
1 = Not enough memory. (See CMSG command for further details.)
EV_CONST_NRG
1 = A period of constant energy was detected. Use this indicator for line disconnection. (See
CONST_NRG_TIME_COUNT in Table 2-8.)
EV_VOX
1 = A period of silence (no energy) was detected on the telephone line. Use this indicator for line disconnection. (See VOX_TIME_COUNT in Table 2-8.)
EV_RESET
When the VoiceDSP processor completes its power-up sequence and enters the RESET state, this bit is
set to 1, and the MWRQST signal is activated (cleared to 0). Normally, this bit changes to 0 after performing the INIT command. If this bit is set during normal operation of the VoiceDSP processor, it indicates an internal VoiceDSP processor error. The microcontroller can recover from such an error by reinitializing the system.
EV_DTMF
1 = Started detection of a DTMF tone.
2-34
Voice Solutions in Silicon™
ISD-T360SB
2—SOFTWARE
Example
GSW
Byte sequence:
Description:
GT
Microcontroller
VoiceDSP
14
AA
AA
14
00
40
Get the VoiceDSP processor Status Word (typically sent after the MMRQST signal is
asserted by the VoiceDSP processor which indicates a change in the status word).
The VoiceDSP processor responds that the memory is full.
Generate Tone tone
Generates the tone specified by the 1-byte tone parameter. The VoiceDSP state changes to
TONE_GENERATE. The tone generation continues until an S command is received.
A DTMF or a single frequency tone may be generated as shown:
To generate a DTMF encode the bits as follows:
Bit 0
1
Bits 1–4
DTMF code.
Where the DTMF code is encoded as follows:
Value (Hex)DTMF Digit
0 to 90 to 9
A A
B *
C #
D B
E C
F D
Bits 5–7
0
To generate a single frequency tone encode the bits as follows:
Bit 0
0
Bits 1-5
3–30
The value in bits 1–5 is multiplied by 100 to generate the required frequency (300Hz–3000Hz).
ISD
2-35
ISD-T360SB
2—SOFTWARE
Bits 6-7
0
The VoiceDSP processor does not check for the validity of the tone specification. Invalid specification
yields unpredictable results.
Example
GT 20
Byte sequence:
Description:
Microcontroller
VoiceDSP
0D
20
0D
20
Generate a single-frequency 1600Hz tone.
Get Time and Day time_day_option
GTD
Returns the time and day as a 2-byte value. time_day_option may be one of the following:
0
Get the system time and day.
1
Get the current message time-and-day stamp.
Any other time_day_option returns the time-and-day stamp of the current message.
Time and day are encoded as follows:
Bits 0–2
Day of the week (1 through 7).
Bits 3–7
Hour of the day (0 through 23).
Bits 8–13
Minute of the hour (0 through 59).
Bits 14–15
NOTE
2-36
00
The time was not set before the current message was recorded.
11
The time was set, i.e., the SETD (Set Time of Day) command was executed.
If the current message is undefined, and time_day_option is 1, an ERR_INVALID error is reported.
Voice Solutions in Silicon™
ISD-T360SB
2—SOFTWARE
Example
GTD 1
Byte sequence:
Description:
Microcontroller
VoiceDSP
0E
01
AA
AA
0E
01
E8
29
Get the current message time-and-day stamp.
The VoiceDSP processor responds that the message was created on the first day of the
week at 5:40 A.M. The return value also indicates that the SETD command was used to
set the system time and day before the message was recorded.
Note: If the SAS command is used to announce the time-and-day stamp, “Monday” is
announced as the first day of the week. For an external vocabulary, the announcement
depends on the vocabulary definition (See the IVS User’s Manual for more details).
Get Tagged Message tag_ref tag_mask dir
GTM
Selects the current message, according to instructions in dir, to be the first, nth next or nth previous message which complies with the equation:
message tag and tag_mask = tag_ref and tag_mask.
where and is a bitwise AND operation.
dir is one of the following:
0
Selects the first (oldest) message.
-128
Selects the last (newest) message.
n
Selects the nth next message starting from the current message.
–n
Selects the nth previous message starting from the current message.
To select the nth message with a given tag to be the current message you must first select the first message that complies with the above equation, and then issue another GTM command with n – 1 as a
parameter, to skip to the nth message.
NOTE
To select the nth, or -nth, message with a given tag to be the current message you must first select
the first message (dir=0), or the last message (dir=-128), that complies with the above equation, and
then issue another GTM command with n-1 (for next message), or -n+1 (for previous message), as a
parameter, to skip to the nth, or -nth, message respectively.
\f a message is found, it becomes the current message and 1 (TRUE) is returned. If no message is
found, the current message remains unchanged and 0 (FALSE) is returned.
If dir is not 0, and the current message is undefined the return value is unpredictable. After the command execution the current message may either remain undefined or changed to any existing
message. The only exception is when the GTM command is executed just after the DM command.
(See the DM command for further details.)
To access the nth message, when n > 127, a sequence of GTM commands is required.
ISD
2-37
ISD-T360SB
2—SOFTWARE
Example
GTM FFCE 003F 0
Byte sequence:
Description:
09
FF
CE
00
3F
00
AA
Microcontroller
09
FF
CE
00
3F
00
01
VoiceDSP
Select the oldest of the new ICMs, in mailbox number 6, to be the current message, for a
system where the message tag is encoded as described in the example for the DMS
command.
The VoiceDSP processor returns a value indicates that there is such a message.
The following pseudo-code demonstrates how to play all new ICMs in mailbox number
6. The messages are marked as old after being played:
Return_val = GTM(FFCE, 003F, 00) /*Get the oldest message with the defined
tag*/
While (ReturnVal == TRUE)
Begin
P() /* Play */
Message_tag = GMT() /* Get message tag */
SMT(FFF7) /* Mark the message as ‘old’ */
GTM(FFCE, 003F, 01) /* Get next message with the same tag */
End
GTUNE
Get Tune index
Gets the value of the tunable parameter identified by index (one byte) as the 2-byte value,
parameter_value. This command may be used to read and identify the parameter value that was set
to tune the VoiceDSP.
If index does not point to a valid tunable parameter, ERR_PARAM is set in the error word.
The GTUNE command may be used in IDLE state or RESET state. If TUNE command was not used to set
the tunable parameters, then the GTUNE command will read the default parameter value.
Tables 2-4 to 2-11 describe the tunable parameters, their index numbers and their
default values.
Example
GTUNE 17
Byte sequence:
Description:
2-38
Microcontroller
VoiceDSP
Get the minimum period for busy detection
ComactSPEECH responds:
700 (7 seconds).
06
17
AA
AA
06
17
02
BC
Voice Solutions in Silicon™
ISD-T360SB
2—SOFTWARE
INIT
Initialize System
Execute this command after the VoiceDSP processor has been configured (see CFG command). INIT
performs a soft reset of the VoiceDSP as follows:
• Initializes the message directory information.
• Messages are not deleted. To delete the messages, use the DM and DMS commands.
• Sets the detectors mask to 0.
• Sets the volume level that is controlled by the VC command, to 0.
• Sets the playback speed to normal (0).
• Switches to the IDLE state.
• Initializes the tone detectors.
The current message is undefined after INIT execution.
The tunable parameters are not affected by this command. They are set to their default values only
during RESET.
Example
INIT
Byte sequence:
Description:
INJ
Microcontroller
VoiceDSP
Initialize the VoiceDSP processor.
13
13
Inject IVS Data n byte1. . . byten
Injects vocabulary data of size n bytes to good Flash blocks.
This command programs Flash devices, on a production line, with IVS vocabulary data. It is optimized
for speed; all VoiceDSP processor detectors are suspended during execution of the command. Use
the CVOC command to check whether programming was successful.
If there is not enough memory space for the vocabulary data, ERR_PARAM is set in the error word, and
execution stops.
Flash blocks that include IVS data can not be used for recording, even if only one byte of the block
contains IVS data (e.g., if the vocabulary size is 4K + 100 bytes, two blocks of the Flash are not available
for message recording).
Example
INJ 00000080
Data
Byte sequence:
Description:
ISD
29
Microcontroller
29
VoiceDSP
Inject 128 bytes of vocabulary data.
00
00
00
80
Vocabulary Data
00
00
00
80
Echo of Data
2-39
ISD-T360SB
MR
2—SOFTWARE
Memory Reset
Erases all memory blocks and initializes the VoiceDSP processor (does exactly what the INIT command
does). Bad blocks, and blocks which are used for IVS vocabularies, are not erased. This command can
be issued in either RESET or IDLE states.
NOTE
When Memory Reset is used in RESET state, it must be issued after the CFG command is issued, or the
memory type and number of devices are not defined. In this case the result is unpredictable.
NOTE
The command erases all messages and should be used with care.
Example
MR
Byte sequence:
Microcontroller
2A
VoiceDSP
Erase all memory blocks.
2A
Description:
P
Playback
Begins playback of the current message. The VoiceDSP processor state changes to PLAY. When playback is complete, the VoiceDSP processor sets the EV_NORMAL_END bit in the status word, and activates (clears to 0) the MWRQST signal. The state then changes to IDLE. Playback can be paused with
the PA command, and can be resumed later with the RES command. Playback can be stopped with
the S command.
If the current message is undefined, ERR_INVALID is reported.
Example
P
Byte sequence:
Description:
PA
Microcontroller
VoiceDSP
Play the current message.
03
03
Pause
Suspends the execution of the current GT, P, R, SAS, SO, SW, or SS command. The PA command does
not change the state of the VoiceDSP processor; execution can be resumed with the RES command.
NOTE
2-40
DTMF and tone detectors remain active during Pause.
Voice Solutions in Silicon™
ISD-T360SB
2—SOFTWARE
Example
PA
Byte sequence:
Description:
PDM
Microcontroller
VoiceDSP
1C
1C
Suspend playback of current message.
Go To Power-Down Mode
Switches the VoiceDSP processor to power-down mode (see “POWER-DOWN MODE” on page 1-4 for
details). Sending any command while in power-down mode resets the processor detectors, and returns it to normal operation mode.
NOTE
If an event report is pending (MWRQST is active) and not processed by the microcontroller prior to
issuing the PDM command, the event is lost.
Example
PDM
Byte sequence:
Microcontroller
1A
1A
Description:
VoiceDSP
Put the VoiceDSP processor in power-down mode.
R
Record tag compression_rate
Records a new message with message tag tag and compression rate compression_rate. The VoiceDSP processor state changes to RECORD. The R command continues execution until stopped by the S
command. Recording can be paused with the PA command, and can be resumed later with the RES
command.
If the memory becomes full, recording stops and EV_MEMFULL is set in the status word.
See “Message Tag” on page 2-3 for a description of message-tag encoding.
The compression rate may be defined as 0 for PCM recording or either 1, 3, 6 for compression rates 5.3
Kbits/sec, 9.9 Kbits/sec, 16.8 Kbits/sec respectively. See “ VCD” on page 2-10 for a description of the
compression algorithm.
NOTE
A time-and-day stamp is automatically attached to each message. Before using the R command
for the first time, use the SETD command. Failure to do so results in undefined values for the time-andday stamp.
Example of a typical recording session:
• (ICM) The microcontroller detects the first ring.
• (ICM, OGM, memo) The microcontroller sends the R command.
ISD
2-41
ISD-T360SB
2—SOFTWARE
Example
R 000E 03
Byte sequence:
Description:
RDET
0C
00
0E
03
Microcontroller
0C
00
0E
03
VoiceDSP
Record a new ICM in mailbox Number 6 in a system where the message tag is encoded
as described in the example of the DMS command. The compression rate is defined as
9.9 Kbits/sec.
Reset Detectors detectors_reset_mask
Resets the VoiceDSP processor tone and energy detectors according to the value of the
detectors_reset_mask parameter. A bit set to 1 in the mask, resets the corresponding detector. A bit
cleared to 0 is ignored.
The 1-byte detectors_reset_mask is encoded as follows:
Bit 0
Reset the busy and dial tone detectors.
Bits 1–3
Reserved. Must be cleared to 0.
Bit 4
Reset the constant energy detector.
Bit 5
Reset the no energy (VOX) detector.
Bit 6
Reset the DTMF detector.
Bit 7
Reserved. Must be cleared to 0.
Example
RDET 20
Byte sequence:
Description:
2-42
Microcontroller
VoiceDSP
Reset the VOX detector.
2C
20
2C
20
Voice Solutions in Silicon™
ISD-T360SB
2—SOFTWARE
RES
Resume
Resumes the activity that was suspended by the PA, SB, or SF commands.
Example
RES
Byte sequence:
Description:
RMSG
Microcontroller
VoiceDSP
Resume playback which was suspended by either the PA, SF or SB command.
1D
1D
Read Message
Returns 32 bytes of data from the current position of the message pointer, and advances the message
pointer by 32 bytes.
If the VoiceDSP processor was in the IDLE state, the command opens the current message, switches
the VoiceDSP processor to the MSG_OPEN state, sets the message pointer to the beginning of the message data, and returns the 32 bytes of data.
The microcontroller must issue an S command to close the message, and switch the VoiceDSP processor to the IDLE state.
If the current message is undefined, ERR_INVALID is reported.
Trying to read beyond the end of the message sets the EV_NORMAL_END event, and the VoiceDSP
processor switches to the IDLE state. In this case, the return value is undefined and should be ignored.
Example
RMSG
Byte sequence:
Description:
S
AA
AA
Microcontroller
32
VoiceDSP
32
32 bytes of data
Read 32 bytes from the current message memory.
...
Stop
Stops execution of the current command and switches the VoiceDSP processor to the IDLE state. S
may be used to stop the execution of CMSG, SMSG, WMSG, RMSG and all asynchronous commands.
Example
S
Byte sequence:
Description:
ISD
00
Microcontroller
00
VoiceDSP
Stop current activity (e.g., playback, recording) and change the VoiceDSP processor
to IDLE state.
2-43
ISD-T360SB
SAS
2—SOFTWARE
Say Argumented Sentence sentence_n arg
Announces sentence number sentence_n of the currently selected vocabulary, and passes arg.
sentence_n and arg are each 1-byte long. The VoiceDSP processor state changes to SYNTHESIS.
When playing is complete, the VoiceDSP processor sets the EV_NORMAL_END bit in the status word,
and activates the MWRQST signal. The state then changes to IDLE.
If the current vocabulary is undefined, ERR_INVALID is reported.
Example
SAS 00 03
Byte sequence:
Microcontroller
Description:
1E
00
03
VoiceDSP
Announce the first sentence in the sentence table of the currently selected vocabulary
with ‘3’ as the actual parameter.
SB
1E
00
03
Skip Backward time_length
Skips backward in the current message time_length units, in 0.2 second segments, and pauses message playback. The RES command must be issue to continue playback. time_length is a 2-byte parameter that can have any value up to 320 (64 seconds). The skip accuracy is five percent. SB is
meaningful only in the PLAY state.
If the beginning of the message is detected during the execution of the SB command, execution terminates, the EV_NORMAL_END bit in the status register sets, the MWRQST signal activates, and the processor switches to the IDLE state.
If time_length is greater than 320, ERR_PARAM is set in the error word.
Playback speed does not affect the behavior of this command.
Example
SB 0019
Byte sequence:
Microcontroller
Description:
23
00
19
VoiceDSP
Skip backwards five seconds from the current position in the message being played.
SDET
23
00
19
Set Detectors Mask detectors_mask
Controls the reporting of detection of tones and energy detectors according to the value of the
detectors_mask parameter. A bit set to 1 in the mask, enables the reporting of the corresponding detector. A bit cleared to 0 disables the reporting.
Disabling reporting of a detector does not stop or reset the detector.
The 1-byte detectors_mask is encoded as follows:
2-44
Voice Solutions in Silicon™
ISD-T360SB
2—SOFTWARE
Bit 0
Report detection of a busy tone.
Bit 1
Report detection of a dial tone.
Bit 2-3
Reserved. Must be cleared to 0.
Bit 4
Report detection of a constant energy.
Bit 5
Report detection of no energy (VOX) on the line.
Bit 6
Report the ending of a detected DTMF.
Bit 7
Report the start of a detected DTMF (up to 40 ms after detection start).
Example
SDET A3
10
Byte sequence: Microcontroller
10
VoiceDSP
Description:
Set reporting of all VoiceDSP processor detectors, except for end-of-DTMF.
SE
B3
B3
Skip to End of Message
This command is valid only in the PLAY state. When invoked, playback is suspended (as for the PA command), and a jump to the end of the message is performed. Playback remains suspended after the
jump.
Example
SE
Byte sequence:
Description:
ISD
Microcontroller
VoiceDSP
24
24
Skip to end of current message.
2-45
ISD-T360SB
SETD
2—SOFTWARE
Set Time and Day time_and_day
Sets the system time and day as specified by the 2-bytes time_and_day parameter. The time_and_day
parameter is encoded as follows:
Bits 0–2
Day of the week (1 through 7).
Bits 3–7
Hour of the day (0 through 23).
Bits 8–13
Minute of the hour (0 through 59).
Bits 14–15
Must be set to 1.
If time_and_day value is not valid, ERR_PARAM is set in the error word.
Example
SETD DE09
Byte sequence:
Description:
SF
0F
DE
09
Microcontroller
0F
DE
09
VoiceDSP
Set time and day to Monday 1.30 A.M. (where Monday is the first day of the week)
Skip Forward time_length
Skips forward in the current message time_length units, in 0.2 second segments, and causes message
playback to pause. The RES command must be issue to continue playback. time_length is a 2-byte
parameter that can have any value up to 320 (64 seconds). The skip accuracy is five percent. This
command is meaningful only in the PLAY state. The RES command must be issue to continue playback.
If the end of the message is detected during execution of SF, execution of the command is terminated
the EV_NORMAL_END bit in the status word is set, the MWRQST signal is activated and the processor
switches to the IDLE state.
If time_length is greater than 320, ERR_PARAM is set in the error word.
Playback speed does not affect the behavior of this command.
Example
SF 0019
Byte sequence:
Description:
2-46
22
00
19
Microcontroller
22
00
19
VoiceDSP
Skip forward five seconds from the current position in the message being played.
Voice Solutions in Silicon™
ISD-T360SB
2—SOFTWARE
Set Message Pointer num_of_pages
SMSG
Sets the message pointer to num_of_pages x 32 bytes from the beginning of the current message data.
If the VoiceDSP processor was in the IDLE state, the command opens the current message and switches the VoiceDSP processor to the MSG_OPEN state. The microcontroller must issue an S command to
close the message, and switch the VoiceDSP processor to the IDLE state.
If num_of_pages x 32 is greater than the message length, EV_NORMAL_END is set in the status word,
the message pointer is set to the end of the message, and the VoiceDSP processor switches to the IDLE
state.
If the current message is undefined, ERR_INVALID is reported.
Example
SMSG 000A
Byte sequence:
Description:
Microcontroller
30
00
0A
VoiceDSP
30
00
0A
Set the message pointer to 10 pages (320 bytes) from the beginning of the current
message data.
Set Message Tag message_tag
SMT
Sets the tag of the current message. The 2-byte message_tag can be used to implement mailbox
functions by including the mailbox number in the tag, or to handle old and new messages differently
by using one bit in the tag to mark the message as old or new. See “Message Tag” on page 2-3.
To change the message tag, you should first get the tag using the GMT command, read the tag, modify it, and write it back.
NOTE
Message tag bits can only be cleared. Message tag bits are set only when a message is first created.
If the current message is undefined, ERR_INVALID is reported.
Example
SMT FFF7
Byte sequence:
Description:
05
FF
F7
Microcontroller
05
FF
F7
VoiceDSP
Mark the current message as old in a system where the message tag is encoded as
described in the example of the DMS command.
Note that the VoiceDSP processor ignores bits in the tag which are set to 1; only bit 3 is
modified in the message tag.
ISD
2-47
ISD-T360SB
2—SOFTWARE
Say One Word word_number
SO
Plays the word number word_number in the current vocabulary. The 1-byte word_number may be any
value from 0 through the index of the last word in the vocabulary. The VoiceDSP processor state
changes to SYNTHESIS.
When playback of the selected word has been completed, the VoiceDSP processor sets the
EV_NORMAL_END bit in the status word, and activates the MWRQST signal. The state then changes to
IDLE.
If word_number is not defined in the current vocabulary, or if it is an IVS control or option code,
ERR_PARAM is set in the error word.
If the current vocabulary is undefined, ERR_INVALID is reported.
Example
SO 00
Byte sequence:
Microcontroller
Description:
VoiceDSP
Announce the first word in the word table of the currently selected vocabulary.
07
07
00
00
Set Playback Speed speed
SPS
Sets the speed of message playback as specified by speed. The new speed applies to all recorded
messages and synthesized messages (only if synthesized using IVS), until changed by another SPS command. If this command is issued while the VoiceDSP processor is in the PLAY state, the speed also
changes for the message currently being played.
Speed may be one of 13 values, from –6 to +6. A value of 0 represents normal speed.
NOTE
A negative speed value represents an increase in speed, a positive value represents a decrease in
speed.
NOTE
The playback speed control is not applicable when the stored messages or the IVS data are not
compressed (Stored in PCM format).
The change in speed is approximate, and depends on the recorded data. In any case, if i < j, playback speed with parameter i is the same or faster than with parameter j.
If speed is not in the –6 to +6 range, ERR_PARAM is set in the error word.
Example
SPS FB
Byte sequence:
Description:
2-48
Microcontroller
VoiceDSP
Set playback speed to –5.
16
FB
16
FB
Voice Solutions in Silicon™
ISD-T360SB
2—SOFTWARE
Say Sentence sentence_n
SS
Say sentence number sentence_n of the currently selected vocabulary. sentence_n is 1-byte long.
The VoiceDSP processor state changes to SYNTHESIS.
If the sentence has an argument, 0 is passed as the value for this argument.
When playing has been completed, the VoiceDSP processor sets the EV_NORMAL_END bit in the status
word, and activates the MWRQST signal. The state then changes to IDLE.
If sentence_n is not defined in the current vocabulary, ERR_PARAM is set in the error word.
If the current vocabulary is undefined, ERR_INVALID is reported.
Example
SS 00
Byte sequence:
Description:
Microcontroller
1F
00
VoiceDSP
1F
00
Announce the first sentence in the sentence table of the currently selected
vocabulary.
Set Speakerphone Mode mode
SSM
Sets the speakerphone to the mode mode of operation. The command is valid when the VoiceDSP
processor is in IDLE state. mode can be one of:
0
OFF
Deactivate the speakerphone, and return the VoiceDSP processor to
normal operation mode.
1
ON
Put the VoiceDSP processor in speakerphone mode and activate speakerphone in full-duplex mode i.e., with full cancellation of both the acoustic and the electrical echoes. Tone detectors are not active. Gains in the
Send and Receive paths are set by the relevant tunable parameters.
2
TRANSPARENT Activate the speakerphone with no echo cancellation (this mode is used
for system tuning).
3
MUTE
Activate the speakerphone, while generating silence to the line. The
near-end-listener can hear the far-end-speaker, but not vice versa. Tone
detectors are not active.
4
LISTEN
The line is audible on the speaker. Tone detectors are active. This mode
is used for call generation.
5
Reserved.
6
RESTART
Restart the current speakerphone mode. This mode differs from ON; it
does not require full initialization of the speakerphone. It should be used
to resume the speakerphone operation after HOLD mode or to adjust to
an environment change (e.g., parallel pickup).
7
HOLD
Stop the codec interrupts. Neither side can hear each other.
See “Full-duplex Speakerphone” on page 2-14 for more details.
ISD
2-49
ISD-T360SB
NOTE
2—SOFTWARE
Only commands that are specified in Table 2-3, are active during all speakerphone modes (other
than 0).
Example
SSM 01
Byte sequence:
Microcontroller
2F
01
VoiceDSP
2F
01
Put the VoiceDSP processor into Speakerphone mode, and set the speakerphone to full-duplex mode.
Description:
Set Vocabulary Type type id
SV
Selects the vocabulary table to be used for voice synthesis. The vocabulary type is set according to
the 1-byte type parameter:
0
For compatibility only.
1
External vocabulary in ROM.
2
External vocabulary in Flash.
3-7
Reserved.
The host is responsible for selecting the current vocabulary, with SV command, before using an SAS,
SO, SS or SW command. Each external vocabulary table has a unique id which is part of the vocabulary internal header (See the IVS User’s Guide for more details). If type is 1 or 2, the VoiceDSP processor
searches for the one byte id parameter in each vocabulary table header until a match is found.
If the id parameter does not point to a valid IVS vocabulary, ERR_PARAM is set in the error word.
Example
SV 02 03
Byte sequence:
Description:
SW
20
02
03
Microcontroller
20
02
03
VoiceDSP
Select the vocabulary with vocabulary-id 3, which resides on a Flash, as the current
vocabulary.
Say Words n word1. . . wordn
Plays n words, indexed by word1 to wordn. The VoiceDSP processor state changes to SYNTHESIS.
On completion, the EV_NORMAL_END bit in the status word is set, and the MWRQST signal goes low.
The state then changes to IDLE.
If one of the words is not defined in the current vocabulary, or if it is an IVS control or option code, or
if n > 8, ERR_PARAM is reported.
2-50
Voice Solutions in Silicon™
ISD-T360SB
2—SOFTWARE
If the current vocabulary is undefined, ERR_INVALID is reported.
Example
SW 02 00 00
Byte sequence:
Description:
TUNE
21
02
00
00
Microcontroller
21
02
00
00
VoiceDSP
Announce the first word, in the word table of the currently selected vocabulary, twice.
Tune index parameter_value
Sets the value of the tunable parameter identified by index (one byte) to the 2-byte value,
parameter_value. This command may be used to tune the DSP algorithms to a specific Data Access
Arrangement (DAA) interface, or to change other parameters. If you do not use TUNE, the VoiceDSP
processor uses default values.
If index does not point to a valid tunable parameter, ERR_PARAM is set in the error word.
NOTE
The tunable parameters are assigned with their default values on application of power. The INIT
command does not affect these parameters.
The following tables 2-4 to 2-11 describe the tunable parameters, their index numbers and their default
values, grouped by their functionality.
Table 2-4: TUNABLE PARAMETERS: Voice Compression and Decompression (VCD)
Index
Parameter Name
Description
Default
4
Voice Activity
Detection (VAD):
VAD_SIL_THRESHOLD
Prevents speech from being interpreted as silence. The silence
detection algorithm has an adaptive threshold, which is
changed according to the noise level. This parameter is,
therefore, only the initial threshold level.
Legal values: 9216 to 13824 in 512 (6 dB) steps.
11264
5
Voice Activity
Detection (VAD):
VAD_SIL_THRESHOLD_ST
EP
Defines the adaptive threshold changes step.
If this threshold is too low, the threshold converges too slowly. If
it is too high, silence detection is too sensitive to any noise.
Legal values: 3 to 48.
12
6
Voice Activity
Detection (VAD):
VAD_SIL_BURST_THRESH
OLD
The minimum time period for speech detection, during
silence. As this threshold increases, the time period
interpreted as silence increases.
If this threshold is too low, a burst of noise is detected as
speech. If it is too high, words may be partially cut off.
Legal values: 1 to 3.
2
ISD
2-51
ISD-T360SB
2—SOFTWARE
Table 2-4: TUNABLE PARAMETERS: Voice Compression and Decompression (VCD)
Index
Parameter Name
Description
Default
7
Voice Activity
Detection (VAD):
VAD_SIL_HANG_THRESH
OLD
The minimum time period for silence detection, during
speech. As this threshold increases, the time period
interpreted as silence decreases.
If this threshold is too low, words may be partially cut off. If it is
too high, no silence is detected.
Legal values: 8 to 31.
15
8
Voice Activity
Detection (VAD):
VAD_SIL_ENABLE
Silence compression control.
0 turns silence compression off.
Note: Silence compression must be turned off when using
ARAM for voice storage. Otherwise the playback quality is
unpredictable.
1
9
Voice Activity
Detection (VAD):
VAD_ENERGY_FACTOR
Determines the energy level used to synthesize silence. For the
default value, the energy levels of the synthesized silence and
the recorded silence are the same.
If you divide (multiply) the default value by two, the
synthesized silence is 6 dB less (more) than the level of the
recorded silence.
Legal values: 1024 to 16384.
8192
70
SW Automatic Gain
Control (SW AGC):
SWAGC_ENABLE
SW AGC control.
0 turns SW AGC off.
1
11
SW Automatic Gain
Control (SW AGC):
SWAGC_FACTOR
Determines the maximum gain that the SW AGC algorithm
may use.
Legal values: 0, 1, 2, 4, 8, 16, 32, 64, 128
Note: Value 0 means the the maximum gain is defined by the
algorithm.
128
2-52
Voice Solutions in Silicon™
ISD-T360SB
2—SOFTWARE
Table 2-5: TUNABLE PARAMETERS: Tone Generation and Message Playback
Index
Parameter Name
Description
Default
27
DTMF Generation:
A one-byte value that controls the twist level of a DTMF tone, 66
DTMF_GEN_TWIST_LEVEL generated by the GT command, by controlling the energy
level of each of the two tones (low frequency and high
frequency) composing the DTMF tone. The Least Significant
Nibble (LSN) controls the low tone and the Most Significant
Nibble (MSN) controls the high tone. The energy level of each
tone, as measured at the output of a TP3054 codec (before
the DAA) connected to the VoiceDSP processor is summarized
in the following table:
Nibble Value
Tone Energy (dB-Volts)
0
0
1
–17.8
2
–14.3
3
–12.9
4
–12.4
5
–12.0
6
–11.9
7
–11.85
8..15
–11.85
The volume of the generated DTMF tone during
measurements was 6. (TONE_GEN_LEVEL+VOL_LEVEL = 6).
For the default level, the high tone is –14.3 dBV and the low
tone is –12.4 dBV, which gives a DTMF twist level of 1.9 dB.
The energy level of a single generated tone is the level of the
low tone.
16
Tone Generation:
TONE_GEN_LEVEL
Controls the energy level at which DTMF and other tones are
generated. Each unit represents 3 dB. The default level is the
reference level.
For example, if you set this parameter to 4, the energy level is
6 dB less than the default level. The actual output level is the
sum of TONE_GEN_LEVEL and the VOL_LEVEL variable,
controlled by the VC command. The tones are distorted when
the level is set too high.
Legal values: 0 ≤ TONE_GEN_LEVEL + VOL_LEVEL ≤ 12.
6
21
VCD Playback and
Voice Synthesis:
VCD_PLAY_LEVEL
Controls the energy during playback and external voice
synthesis. Each unit represents 3 dB. The default level is the
reference level.
For example, if you set this parameter to 4, the energy level is
6 dB less than the default level. The actual output level is the
sum of VCD_LEVEL and the VOL_LEVEL variable, controlled by
the VC command. Speech is distorted when the level is set
too high.
Legal values: 0 ≤ VCD_PLAY_LEVEL + VOL_LEVEL ≤ 12.
6
ISD
2-53
ISD-T360SB
2—SOFTWARE
Table 2-6: TUNABLE PARAMETERS: DTMF Detection
Index
Parameter Name
Description
Default
17
Energy Level:
DTMF_DET_MIN_ENERG
Y
Minimum energy level at which DTMF tones are detected. If
you divide (multiply) the value by 2, the detection sensitivity
decreases (increases) by 3 dB.
Legal values: 8 to 4096
32
24
Echo Canceler:
DTMF_DET_ECHO_DELA
Y
The near-echo delay in samples. The sampling rate is 8000Hz
(i.e., 125 ms per sample).
Legal values: 0 to 16.
4
26
Twist Level:
DTMF_DET_REV_TWIST
Controls the reverse twist level at which the VoiceDSP
processor detects DTMF tones. While the normal twist is set at 8
dB, the reverse twist can be either 4 dB (default) or 8 dB (if this
parameter is set to 1).
0
60
SW AGC:
DTMF_DET_AGC_IDLE
SW AGC for DTMF in idle/record modes. When incrementing
the tunable by 1, the dynamic range is increased by 3 dB.
Legal values: 0 to 5.
0
61
SW AGC:
DTMF_DET_AGC_PLAY
Software AGC for play mode and tone generation modes.
When incrementing the tunable by 1, the dynamic range
increases by 3 dB.
Legal values: 0 to 16.
3
2-54
Voice Solutions in Silicon™
ISD-T360SB
2—SOFTWARE
Table 2-7: TUNABLE PARAMETERS: Tone Detection
Index
Parameter Name
Description
Default
18
Dial Tone:
Controls the duration of a tone before it is reported as a dial
700
TONE_DET_TIME_COUNT tone, in 10 msec units. The accuracy of the constant is ±10 ms.
Legal values: 0 to 65535.
19
Busy and Dial Tone:
TONE_DET_ON_ENERGY
_
THRESHOLD
Minimum energy level at which busy and dial tones are
detected as ON (after 700Hz filtering). If you divide (multiply)
the value by 2 you get about 3 dB decrease (increase) in the
threshold.
The mapping between energy level and the parameter value
is as follows (measured on the codec output when a 400Hz
tone was injected to the codec input):
Tunable value
Energy threshold (dB-Volts)
10
–31.8
20
–28.6
100
–21.7
500
–14.7
8000
–2.5
Legal values: 0 to 65535.
160
20
Busy and Dial Tone:
TONE_DET_OFF_ENERGY
_
THRESHOLD
Maximum energy level at which busy and dial tones are
detected as OFF (after 700Hz filtering). If you divide (multiply)
the value by 2 you get about 3 dB decrease (increase) in the
threshold.
The mapping between energy level and the parameter value
is the same as for TONE_ON_ENERGY_THRESHOLD
Legal values: 0 to 65535.
110
23
Busy Tone:
BUSY_DET_MIN_TIME
Minimum time period for busy detection, in 10 ms units. The
accuracy of the constant is ±10 ms.
Legal values: 0 to 65535.
600
53
Busy Tone:
BUSY_DET_MIN_ON_TIM
E
Minimum period considered as On period for busy tone
detection. Note that for weak signals:
(–30 dB and below) the maximum value is 12 (i.e., 120 ms
minimum detection time).
Unit: 10 ms. Accuracy is ±20 ms.
Legal values: 10 to 1000.
10
54
Busy Tone:
Maximum period considered as On for busy-tone detection.
BUSY_DET_MAX_ON_TIM Unit: 10 ms. Accuracy is ±20 ms.
E
Legal values: 10 to 1000.
ISD
168
2-55
ISD-T360SB
2—SOFTWARE
Table 2-7: TUNABLE PARAMETERS: Tone Detection
Index
Parameter Name
Description
Default
55
Busy Tone:
Minimum period considered as Off for busy-tone detection.
BUSY_DET_MIN_OFF_TIM Unit: 10 ms. Accuracy is ±20 ms.
E
Legal values: 5 to 1000.
7
56
Busy Tone:
BUSY_DET_MAX_OFF_TI
ME
Maximum period considered as On for busy-tone detection.
Unit: 10 ms. Accuracy is ±20 ms.
Legal values: 5 to 1000.
122
57
Busy Tone:
BUSY_DET_VERIFY_COU
NT
Number of On/Off cadences that must be detected prior to
reporting busy-tone presence.
Legal values: 9 to 127.
9
58
Busy Tone:
BUSY_DET_TONE_TYPE
Specifies the type of busy tone to detect:
1 —Two cadences
2 —Three cadences
3 —Both two and three cadences
1
59
Busy Tone:
BUSY_DET_DIFF_THRESH
OLD
The maximum allowed difference between two compared
On or Off periods. Unit: 10 ms.
Legal values: 0 to 1000.
9
2-56
Voice Solutions in Silicon™
ISD-T360SB
2—SOFTWARE
Table 2-8: TUNABLE PARAMETERS: Energy Detection
Index
Parameter Name
Description
Default
10
Silence (VOX):
This parameter determines the minimum energy level at
VOX_DET_ENERGY_THRE which voice is detected. Below this level, it is interpreted as
SHOLD
silence.
Legal values: 1 to 32767.
12
12
Silence (VOX):
VOX_DET_TIME_COUNT
700
22
Silence (VOX):
Controls the maximum energy-period, in 10 ms units, that does
VOX_DET_TOLERANCE_T NOT reset the vox detector.
IME
Legal values: 0 to 255.
3
47
Constant Energy:
Minimum elapsed time until the VoiceDSP processor reports
CONST_NRG_DET_TIME_ constant energy level. Units: 10 ms. Accuracy: ±10 ms
Legal values: 1 to 65534
COUNT
700
48
Constant Energy:
CONST_NRG_DET_
TOLERANCE_TIME
Variations in constant energy, up to this time, do not reset the
constant energy detector. Units: 10 ms.
Legal values: 0 to 255
5
49
Constant Energy:
CONST_NRG_DET_LOW
_
THRESHOLD
Determines the minimum energy level that is treated as
1
constant energy. The minimum energy is calculated as follows:
(1—1/2CONST_NRG_DET_LOW_THRESHOLD) * average_energy
Legal values: 1 to 16
50
Constant Energy:
CONST_NRG_DET_HIGH
_
THRESHOLD
Determines the maximum energy level that is treated as
constant energy. The maximum energy is calculated as
follows:
(1 + 1/2CONST_NRG_DET_HIGH_THRESHOLD ) * average_energy
Legal values: 0 to 16
ISD
This parameter, in units of 10 ms, determines the period of
silence before the VoiceDSP processor reports silence. The
accuracy of the constant is ±10 ms.
Legal values: 0 to 65535.
1
2-57
ISD-T360SB
2—SOFTWARE
Table 2-9: TUNABLE PARAMETERS: Speakerphone
Index
Parameter Name
Description
Default
31
Acoustic Echo
Canceler (AEC):
SP_AEC_PRIORITY_BIAS
Controls the bias in priority between the Send and Receive
paths.
If send priority-bias is preferred, the value should be greater
than zero.
For no priority bias, the value should be zero.
For priority bias for the Receive path, the value should be
negative.
Steps are 3 dB each (e.g., +3 is 9 dB bias for the Send path, –2
is 6 dB bias for the Receive path).
Legal values: –4 to 4.
0
32
Acoustic Echo
Canceler (AEC):
SP_AEC_COUPLING_
LOSS_THRESHOLD
This parameter limits the acoustic return loss. Its value
(SP_AEC_COUPLING_LOSS_THRESHOLD / 32767) is compared
with the RMS value of Sout divided by the RMS value of Rin,
during a single-talk event. The loop gain is decreased, if
necessary, to control the TCL level.
For SP_AEC_COUPLING_LOSS_THRESHOLD = 32767 this loop is
disabled.
Legal values: 0 to 32767.
2047
34
Acoustic Echo
Canceler (AEC):
SP_AEC_LR_LEVEL
Controls the speakerphone gain from the microphone to the
line-out. The total attenuation, or gain, depends on both of
the analog gains and this value. The gain is:
K * signal
where:
K = SP_AEC_LR_LEVEL/4096.
Legal values: 0 to 16000.
14000
36
Acoustic Echo
Canceler (AEC):
SP_AEC_CLIP_POS
Specifies the positive peak-value at which the analog circuit
of the line-out saturates. Codec analog full scale corresponds
to µLAW full scale values after expansion.Assume that positive
saturation occurs at amplitudes higher than those of a sine
wave at X [dBm0]. The SP_AEC_CLIP_POS value is set as:
SP_AEC_CLIP_POS = 32636 * 10((X – 3.17)/20)
Note: a sine wave with amplitude 4 * 8159 = 32636
corresponds to 3.17 dBm0.
Example:
For X = –6.2761 dBm0, the value is:
SP_AEC_CLIP_POS = 32636 * 10((–6.2761– 3.17)/20) = 0.3371 *
32636 =11000;
Legal values: 0 to 32767.
16000
37
Acoustic Echo
Canceler (AEC):
SP_AEC_CLIP_NEG
Specifies the negative peak value at which the analog circuit
of the line-out saturates. Codec analog full scale corresponds
to µLAW full scale values after expansion.The value of
SP_AEC_CLIP_NEG is set as shown for SP_AEC_CLIP_POS,
above.
Legal values: –32768 to 0.
–16000
2-58
Voice Solutions in Silicon™
ISD-T360SB
2—SOFTWARE
Table 2-9: TUNABLE PARAMETERS: Speakerphone
Index
Parameter Name
Description
Default
40
Acoustic Echo
Canceler (AEC):
SP_AEC_ENABLE
Enables/disables the acoustic echo controller.
Legal values: 0 (disable), 1 (enable).
1
43
Acoustic Echo
Canceler (AEC):
SP_AEC_VOX_HYST
Controls the hysteresis in near-talker detection. (The
speakerphone state machine has a built-in hysteresis
mechanism to prevent fluctuations in the talker identification
process i.e., identifying the active side.) The value of this
parameter is a dimensionless number, which should be
evaluated during the tuning process for specific hardware.
Larger values for the parameter correspond to a wider
hysteresis loop. Negative values increase the probability that
the state machine remains in the last state.
Legal values: –127 to 127.
10
45
Acoustic Echo
Canceler (AEC):
SP_AEC_DTD_TH
Controls the sensitivity of the system. Low values correspond to 73
high sensitivity, with a greater false alarm probability (i.e., an
echo is considered a real talker).
High values correspond to low sensitivity, with slower switching.
This parameter is affected by the loop gain and the specific
hardware characteristics.
Legal values: 0 to 127.
35
Electric Echo Canceler
(EEC):
SP_EEC_LR_LEVEL
Controls the speakerphone gain from the line-in to the
speaker. The total attenuation, or gain, depends on both of
the analog gains and this value. The gain is:
K * signal
where:
K = (SP_EEC_LR_LEVEL/4096) * (2(6 + VOL_LEVEL)/2)
Legal values: 0 to 400.
ISD
281
2-59
ISD-T360SB
2—SOFTWARE
Table 2-9: TUNABLE PARAMETERS: Speakerphone
Index
Parameter Name
Description
Default
38
Electric Echo Canceler
(EEC):
SP_EEC_CLIP_POS
Specifies the positive peak value at which the analog circuit
of the speaker saturates. Codec analog full scale
corresponds to µLAW full scale values after expansion. The
value of SP_EEC_CLIP_POS is set as shown for
SP_AEC_CLIP_POS, above.
Legal values: 0 to 32767.
16000
39
Electric Echo Canceler
(EEC):
SP_EEC_CLIP_NEG
Specifies the negative peak value at which the analog circuit
of the line-out saturates. Codec analog full scale corresponds
to µLAW full scale values after expansion. The value of
SP_EEC_CLIP_NEG is set as shown for SP_AEC_CLIP_POS,
above.
Legal values: –32768 to 0.
–16000
41
Electric Echo Canceler
(EEC):
SP_EEC_ENABLE
Enables/disables the electrical echo controller.
Legal values: 0 (disable), 1 (enable).
1
44
Electric Echo Canceler
(EEC):
SP_EEC_VOX_HYST
Controls the hysteresis in far-talker detection. (The
speakerphone state machine has a built-in hysteresis
mechanism to prevent fluctuations in the talker identification
process i.e., identifying the active side.) The value of this
parameter is a dimensionless number, which should be
evaluated during the tuning process for specific hardware.
Larger values for the parameter correspond to a wider
hysteresis loop. Negative values increase the probability that
the state machine remains in the last state.
Legal values: –127 to 127.
10
46
Electric Echo Canceler
(EEC):
SP_EEC_DTD_TH
Controls the sensitivity of the system. Low values correspond to 82
high sensitivity, with a greater false alarm probability (i.e., an
echo is considered a real talker).
High values correspond to low sensitivity, with slower switching.
This parameter is affected by the loop gain and the specific
hardware characteristics.
Legal values: 0 to 127.
33
Attenuation:
SP_BLOCK_LEVEL
Controls the maximum attenuation level of the speakerphone
suppressors. It affects the speakerphone stability and its
subjective quality. The maximum attenuation is calculated
according to:
SP_BLOCK_LEVEL/228
Legal values: 550 to 32000.
10922
42
Tone Generation:
SP_TONE_GEN_
LEVEL
Controls the energy level at which DTMF, and other tones, are
generated to the line (codec 0) while the speakerphone is
active. Each unit represents 3 dB.
Legal values: 0 ≤ SP_TONE_GEN_LEVEL ≤ 10.
Note: the energy level at which the tones are generated to
the speaker (codec 1) while the speakerphone is active, is
controlled by the TONE_GEN_LEVEL tunable parameter and
the vol_level.
6
2-60
Voice Solutions in Silicon™
ISD-T360SB
2—SOFTWARE
Table 2-10: TUNABLE PARAMETERS: Memory Support
Index
62
Parameter Name
Description
Memory Device Size:
Defines the nubber of blocks (each block is of 4096 bytes) in
NUM_OF_BLOCKS_IN_M every memory device (Flash or ARAM/DRAM). The number
EM
and type of connected devices are defined by the CFG
command.
Default
128
Flash Device Size (Mbits)
Number of Blocks Value
4
128
8
256
16
512
ARAM/DRAM Device Size (Mbits) Number of Blocks Value
16
508
63
Memory Size for Testing Defines the nubber of blocks (each block is of 4096 bytes) in
NUM_OF_BLOCKS_FOR_ every memory device (Flash or ARAM/DRAM) for production
TEST
line testing purposes.
The number should be small to minimize testing time during
the production sequence. However, the number of blocks
should be larger than the number of expected bad blocks in
the memory device.
In case of value=0, no productiontest is performed.
In any case other than value= 0, the number of blocks is
defined by the parameter value, and a production testing
cycle is performed after RESET.
Legal values: 0 to 128.
Note: If power fails during production testing cycle, the
memory status is unpredicted. The memory device should be
replaced and the production test should be repeated.
64
ARAM Quality Level:
MAX_DEFECT_NIBBLES_I
N_BLOCK
ISD
0
Defines the maximum allowed bad nibbles in ARAM block
0
(each block is of 8192 nibbles). A nibble (4 bits) is considered
bad if any bit is defected.
If the number of bad nibbles in a block exceeds the maximum
allowed value, the block is marked as bad block and is not
used for voice storage.
Legal values: 0 to 255.
2-61
ISD-T360SB
2—SOFTWARE
Table 2-11: TUNABLE PARAMETERS: Codec Support (Samples)
Index
Parameter Name
Description
Default
65
Channel 0 Delay:
CFRD0
The delay of codec channel 0 from Frame Synch 0 (CFS0) to
start of valid data.
Legal values: 0 to 255
1
66
Channel 1 Delay:
CFRD1
The delay of codec channel 1 from Frame Synch 0 (CFS0) to
start of valid data.
Legal values: 0 to 255
10
67
Channel 2 Delay:
CFRD2
The delay of codec channel 2 from Frame Synch 0 (CFS0) to
start of valid data.
Legal values: 0 to 255
10
68
Frame Synch Delay:
CFSD
The delay of Frame Synch 1 (CFS1) from Frame Synch 0 (CFS0). 10
Legal values: 0 to 255
69
Data Valiid Delay:
CFET
The delay between Frame Synch 0 (CFS0) to end of valid data 18
of all channels.
Legal values: 0 to 255
Example
TUNE 17 02BC
Byte sequence:
Description:
VC
15
17
Microcontroller
15
17
VoiceDSP
Set the minimum period for busy detection to 700 (7 seconds).
02
BC
02
BC
Volume Control vol_level
Controls the energy level of all the output generators (playback, tone generation, and voice synthesis), with one command. The resolution is ±3 dB.
The actual output level is composed of the tunable level variable, plus the vol_level. The valid range
for the actual output level of each output generator is defined in Table 2-5.
For example, if the tunable variable VCD_LEVEL (parameter number 21) is 6, and vol_level is –2, then
the output level equals VCD_LEVEL + vol_level = 4.
Example
VC 04
Byte sequence:
Description:
2-62
Microcontroller
VoiceDSP
Set the volume level to VCD_LEVEL + 4.
28
04
28
04
Voice Solutions in Silicon™
ISD-T360SB
2—SOFTWARE
Write Message data
WMSG
Writes 32 bytes of data to the current position of the message pointer, and advances the message
pointer by 32 bytes.
If the VoiceDSP processor is in the IDLE state, the command opens the current message, switches the
VoiceDSP processor to the MSG_OPEN state, sets the message pointer to the beginning of the message data, and writes the 32 bytes of data.
To add data at the end of an existing message, issue the SMSG command to the last page of the message. Issue the WMSG command with a buffer consisting of 32 FF bytes (this has no effect on the current data in the page). A subsequent WMSG command adds a new block to the message, and writing
continues at the beginning of the new block.
The microcontroller must issue an S command to close the message and switch the VoiceDSP processor to the IDLE state.
NOTE
When updating an existing message, bits can only be cleared, but not set.
If the current message is undefined, ERR_INVALID is reported.
Example
WMSG 32 bytes
Byte sequence:
Microcontroller
Description:
VoiceDSP
Write 32 bytes in the message memory.
31
31
ISD
32 bytes of data to write
echo 32 bytes of data
2-63
ISD-T360SB
2-64
2—SOFTWARE
Voice Solutions in Silicon™
3—SCHEMATIC DIAGRAMS
ISD-T360SB
Chapter 3ÑSCHEMATIC DIAGRAMS
3.1
APPLICATION INFORMATION
The following schematic diagrams for a
VoiceDSP processor Reference design unit.
This reference design includes three basic
clusters:
• An 80C51 MicroController.
• VoiceDSP processor cluster, including a
TP3054 codec, and an ISDT360SB
controlling a Flash device.
• User interface that includes one 16-digit
LCD, and a 16-key (4 x 4) keypad.
ISD
3-1
ISD-T360SB
3-2
3—SCHEMATIC DIAGRAMS
Voice Solutions in Silicon™
4—PHYSICAL DIMENSIONS
ISD-T360SB
Chapter 4ÑPHYSICAL DIMENSIONS
Figure 4-1: 80-Pin Plastic Quad Flat Package, Top and Bottom—Type: Metric PQFP, 14x14 Body
1.
ISD
All dimensions are in millimeters. All dimensions and tolerances conform to ANSI Y14.5-1982.
4-1
ISD-T360SB
4—PHYSICAL DIMENSIONS
Figure 4-2: 80-Pin Plastic Quad Flat Package,
Side—Type: Metric PQFP, 14x14
Body
Table 4-1: Packaging Dimensions
Symbol
Min.
Nom.
Max.
A
—
2.82
3.00
A1
0.10
0.15
0.25
A2
2.55
2.67
2.75
D
17.20 BSC.
D1
14.00 BSC.
D2
12.35BSC.
ZD
0.825 REF.
E
17.20 BSC.
E1
14.00 BSC.
E2
12.35 BSC.
ZE
0.825 REF.
L
0.88
N
80
e
0.65 BSC.
b
0.22
b1
0.22
ccc
4-2
0.73
1.03
0.38
0.30
0.33
0.12
Voice Solutions in Silicon™
IMPORTANT NOTICES
The warranty for each product of ISD (Information Storage
Devices, Inc.), is contained in a written warranty which governs
sale and use of such product. Such warranty is contained in the
printed terms and conditions under which such product is sold, or
in a separate written warranty supplied with the product. Please
refer to such written warranty with respect to its applicability to
certain applications of such product.
These Product may be subject to restrictions on use. Please
contact ISD, for a list of the current additional restrictions on
these Product. By purchasing these Product, the purchaser of
these Product agrees to comply with such use restrictions. Please
contact ISD for clarification of any restrictions described herein.
ISD, reserves the right, without further notice, to change the ISD
ChipCorder product specifications and/or information in this
document and to improve reliability, functions and design.
ISD assumes no responsibility or liability for any use of the ISD
ChipCorder Product. ISD conveys no license or title, either
expressed or implied, under any patent, copyright, or mask work
right to the ISD ChipCorder Product, and ISD makes no warranties
or representations that the ISD ChipCorder Product are free from
patent, copyright, or mask work right infringement, unless
otherwise specified.
The 100-year retention and 100K record cycle projections are
based upon accelerated reliability tests, as published in the ISD
Reliability Report, and are neither warranted nor guaranteed by
ISD.
Information contained in this ISD ChipCorder data sheet
supersedes all data for the ISD ChipCorder Product published by
ISD prior to December, 1998.
This data sheet and any future addendum to this data sheet is
(are) the complete and controlling ISD ChipCorder product
specifications. In the event any inconsistencies exist between the
information in this and other product documentation, or in the
event that other product documentation contains information in
addition to the information in this, the information contained
herein supersedes and governs such other information in its entirety.
Copyright© 1998, ISD (Information Storage Devices, Inc.) All rights
reserved. ISD is a registered trademark of ISD. ChipCorder is a
trademark of ISD. All other trademarks are properties of their
respective owners.
Application examples and alternative uses of any integrated
circuit contained in this publication are for illustration purposes
only and ISD makes no representation or warranty that such
applications shall be suitable for the use specified.
2045 Hamilton Ave.
San Jose, California 95125-5904
Tel: 408/369-2400
Fax: 408/369-2422
http://www.isd.com
Part No. 2201298D5008