RSC-300/364
Speech Recognition Microcontroller
DATA SHEET
2001 Sensory Inc.
P/N 80-0165-O
1
General Description
The RSC-300/364, from the Interactive Speech
TM
family of products, is designed specifically for
speech applications in consumer electronic
products.
The RSC-300/364 combines an 8-bit processor with
neural-net algorithms to provide high-quality
speaker-independent speech recognition, speaker-
dependent speech recognition, and speaker
verification. The chip also supports speech
synthesis, voice record/playback, 4-voice music
synthesis, and system control. This CMOS device
includes on-chip RAM, ROM (RSC-364 only), 16
general-purpose I/O lines, A/D and D/A converters,
a microphone pre-amplifier, and a 4-MIPS dedicated
processor. The RSC-300 is designed for ROM-less
applications that need more ROM space and
consequently use off-chip memory.
In addition to providing the horsepower needed to
perform speech recognition and speech synthesis,
the processor has sufficient cycles available for
general-purpose product control. The RSC-300/364
Development Kit allows developers to create
custom applications. The Development Kit includes
an assembler, linker, simulator, hardware
development platform, and library of Sensory
technology object code.
The highly integrated nature of this chip reduces
external parts count. A complete system may be
built with only a few passive components in addition
to a battery, speaker, and microphone. Low power
requirements and low-voltage operation make the
RSC-300/364 an ideal solution for battery-powered
and hand-held devices.
The RSC-300/364 uses a pre-trained neural
network to perform speaker-independent speech
recognition, while high-quality speech synthesis is
achieved using a time-domain compression scheme
that improves on conventional ADPCM. Four-voice
music synthesis allows multiple, simultaneous
instruments for harmonizing. Automatic Gain
Control can compensate for people not optimally
positioned with respect to the microphone or for
people who speak too softly or loudly.
Features
High-Performance Processor
4-MIPS performance at 14.32 MHz
16 general purpose I/O lines
Interrupts, timers and counters
Fully static operation; clock rate: DC to 14.32
MHz
Highly-Integrated Single-Chip Solution
Internal 64 kB of ROM (364 only), 2.5 kB of
RAM
12 bit A/D (Analog to Digital) converter
Microphone Pre-amplifier
Internal 32kHz secondary timer
24 x 24 Multiplier
Can store 6 Speaker Dependent words on-
chip
Low Power Requirements
Requires single 2.85V to 5.25V power supply
~10mA operating current at 3V
Low Power 32kHz oscillator
Power-down current less than 5
A
High-Quality Recognition and Synthesis
Recognition accuracy: better than 97%
(Speaker Independent) and 99% (Speaker
Dependent).
Synthesis data rates from 5,000-15,000 bits
per second
4-voice music synthesis capabilities
AGC control compensates for variations in
input signal
Easily Expanded to Larger-Scale Systems
Separate 16-bit Address and 8-bit Data
buses compatible with common memory
components
Separate Code and Data address spaces
and memory strobes
RSC-300/364
Data Sheet
2
P/N 80-0165-O
2002 Sensory Inc.
Table of Contents
General Description................................................................................................................................................. 1
Features .................................................................................................................................................................. 1
Table of Contents .................................................................................................................................................... 2
Introduction.............................................................................................................................................................. 3
Rsc-300/364 Hardware Specifications .................................................................................................................... 5
Using the RSC-300/364 .......................................................................................................................................... 6
Memory Organization .............................................................................................................................................. 7
Memory Map............................................................................................................................................................ 8
General Purpose I/O ............................................................................................................................................... 9
Interrupts ................................................................................................................................................................. 9
Reset and Clocks .................................................................................................................................................. 10
Timers and Counters............................................................................................................................................. 11
Power Down and Wake-Up Operation .................................................................................................................. 11
Analog Outputs...................................................................................................................................................... 12
Hardware Debug Features .................................................................................................................................... 12
Design Considerations .......................................................................................................................................... 13
Omni-Directional Microphone................................................................................................................................ 14
Power Consumption and Power Supply Considerations ...................................................................................... 16
Die Bond Pad and QFP Pin Descriptions.............................................................................................................. 17
Die Pad Ring ......................................................................................................................................................... 18
RSC-300/364 Die Bonding Pad Locations ............................................................................................................ 19
Absolute Maximum Ratings................................................................................................................................... 20
D.C. Characteristics .............................................................................................................................................. 20
Vdd vs. Idd............................................................................................................................................................. 20
A.C. Characteristics (External Memory Accesses) ............................................................................................... 21
Timing Diagrams ................................................................................................................................................... 21
RSC-300/364 Instruction Set................................................................................................................................. 22
RSC-300/364 Special Function Register (SFR) Summary ................................................................................... 24
Quality and Reliability............................................................................................................................................ 38
Packaging.............................................................................................................................................................. 40
Ordering Information ............................................................................................................................................. 41
The Interactive SpeechTM Product Line ................................................................................................................ 42
Data Sheet
RSC-300/364
2002 Sensory Inc.
P/N 80-0165-O
3
Introduction
The RSC-300/364 is the newest member in a family of high-performance 8-bit microprocessors featuring a high
level of integration, targeted to high-accuracy, low-cost speech recognition applications. The RSC-300/364 is
designed to bring accuracy, fast response time and versatility to low-cost, power-sensitive consumer
applications.
A design goal of the RSC-300/364 was to reduce total system cost while increasing system performance. By
including microphone signal amplification, data conversion, recognition and synthesis functionality, and ROM
storage (RSC-364 only) with a CPU core on a single chip, dramatic cost and power reductions are achieved.
Thus, the RSC-300/364 is able to provide 4 MIPS of integer performance at 14.32 MHz. This allows customer
applications to achieve maximum performance at minimum cost.
The CPU core embedded in the RSC-300/364 is an 8-bit, variable-length-instruction, microprocessor. The
instruction set is most similar to the 8051 family of microcontrollers. The RSC-300/364 processor avoids the
limitations of dedicated registers by having completely symmetrical source and destinations for all instructions.
Of the 2.5 Kbytes of internal SRAM, 2 Kbytes are organized as a Data Space, and 0.5 Kbytes is for register
space. All arithmetic operation instructions may be applied to any register. Any pair of adjacent registers (at an
even address) may be used as the 16-bit pointer to either the source or destination for a data movement
instruction. Instruction classes allow the pointer to access internal or external Code Space, internal Register
Space, or external Data Space.
Architecturally, the RSC-300/364's separate data and address buses allow use of standard EPROMs, ROMs,
and SRAMs with little or no additional decoding. Provision for separate read and write signals for each external
memory space further simplifies interfacing.
Creating applications using the RSC-300/364 requires the development of electronic circuitry, software code,
and speech/music data files ("linguistics"). This document provides detailed information on those aspects of the
RSC-300/364 architecture that are important to product designers and programmers. It describes the physical
interface to the chip, printed circuit board layout and other design considerations, the RSC-300/364's instruction
set, and memory organization. Refer to the RSC-300/364 Development Kit Manual for information on using
Sensory's technology code for speech recognition, speaker verification, speech synthesis, and voice record and
playback. Description of vocabulary development ("linguistics") information is beyond the scope of this
document and is covered in a Design Note.
Custom Mask Capabilities of the RSC-364
The RSC-300 provides significant and flexible expansion capabilities through the use of external RAM or ROM
Products using the custom-mask version of the chip, the RSC-364, may save considerable per-unit cost by
avoiding the need for other active devices. The RSC-300 requires an external Code Space ROM memory to
contain the program instructions, synthesis data, and Speaker Independent recognition weights. The custom-
masked RSC-364 with no additional external memory devices must rely on the fixed internal memory for all of its
ROM and RAM requirements. The internal ROM in the RSC-364 is application specific, with the amount
available for user applications decreasing as the number of synthesis words or other technology usage
increases.
These finite resources restrict the capabilities of products based on the RSC-364. The product specification for
the RSC-364 must be carefully crafted in consultation with Sensory to maximize the use of on-chip memory.
Each application will have its own specific limitations, but the table below summarizes some useful guidelines
for planning purposes. Not all of the maximums can be achieved in a single custom-masked RSC-364 design.
For example, a recognition vocabulary of 40 words may limit the speech synthesis to substantially less than 25
seconds.
Note: The RSC-364 (Custom Mask) column assumes no external memory.
RSC-300/364
Data Sheet
4
P/N 80-0165-O
2002 Sensory Inc.
Description
RSC-300
RSC-364
(Custom Mask )
1
Capabilities:
Speaker independent (SI) recognition
Speaker dependent (SD) recognition
Limited
Speech synthesis and special sound effects
Speaker verification
Four-voice music generation
Limited
support
Voice record and playback
Not
supported
6
SI Recognition Capacity :
Maximum number of words per recognition set
1
15 15
Total recognition vocabulary size in words, all sets
Unlimited 40
words
3
SD Recognition Capacity :
Maximum number of words per recognition set
1
64
2
6
3
/64
4
Total recognition vocabulary size in words, all sets
Unlimited
6
3
/512
4
Speaker Verification Capacity :
Number of speakers identified per set
1
64
2
1
3
/64
4
Synthesized Speech Capacity:
Maximum total length of all messages
Unlimited 25
seconds
3
Music Synthesis Capacity
Number of simultaneous independent musical
voices
4 4
Number of musical octaves available
2-4
5
2
Number of musical tunes available
Unlimited
6
Requirement for custom ROM masks:
Custom-masked parts (RSC-364) are not stocked
by Sensory
No Internal ROM
Custom masked
ROM required
1.
Software for the RSC-364 (Custom Masked) applications may be completely developed and verified using the RSC-300/364
Development Kit and an external 64K ROM memory before committing to an RSC-364 custom ROM mask.
2.
Practical limitations to maintain accuracy above 95%.
3.
Assumes the use of on-chip ROM/RAM only
4.
Assumes external serial EEPROM memory.
5.
Depends on choice of musical instrument.
6.
Requires external storage for recordings.
Data Sheet
RSC-300/364
2002 Sensory Inc.
P/N 80-0165-O
5
Rsc-300/364 Hardware Specifications
Architectural Overview of the RSC-300/364
The RSC-300/364 is a highly integrated device
that combines:
An 8-bit RISC microprocessor.
On-chip ROM (64 Kbytes, RSC-364 only),
Register RAM (448 bytes), Data RAM (2
Kbytes) and the ability to address off-chip
RAM or ROM.
Analog-to-digital converter, digital-to-
analog converter, and a pulse width
modulator.
A microphone pre-amplifier
The RSC-300/364 has an external memory
interface for accessing external RAMs, ROMs
or other parallel memory devices. The RSC-
364 also has an internal ROM that can be
enabled or disabled (partially or fully) by pin
inputs (signals -XMH, -XML; See figure 4). ).
When the internal ROM of the RSC-364 is
disabled, its performance is identical to the
RSC-300. With the RSC-364, the entire
program must reside in the internal masked
ROM. External memory can only be used to
store data.
The 8-bit processor can directly access 448
on-chip general-purpose registers (RAM), and
32 additional Special Functions Registers
(SFRs). The instruction set accessing these
registers is completely symmetrical, allowing
movs, arithmetic, and logical operations with
any register as the destination. Two bi-directional ports provide 16 general-purpose I/O pins to communicate
with external devices (See page 9). The RSC-300/364 has a high frequency (14.32 MHz) oscillator as well as a
low frequency (32,768 Hz) oscillator. The processor clock can be selected from either source, with a selectable
divider value. Sensory's technology code requires the use of the 14.32 MHz clock. There are two
programmable 8-bit counters / timers, one derived from each oscillator. A variety of wait state configurations
allow fast code execution and easy interfacing to slow peripheral memories.
An inexpensive electret microphone connects directly to the microphone input of the RSC-300/364. The internal
preamplifier converts the tiny microphone signal to a level suitable for Analog-to-Digital Conversion. (ADC), The
RSC-300/364 uses a Sample and Hold (SH) circuit and ADC converter to convert the amplified analog speech
signal into digital data. The chip may also be used with line-level inputs. The output audio signal of the RSC-
300/364 is derived either from a DAC (Digital-to-Analog Converter) or a PWM (Pulse Width Modulator).
In addition to its on-chip ROM (RSC-364 only) and RAM, the RSC-300/364 has 8 data lines (D[7:0]) and 16
address lines (A[15:0]), along with associated control signals (-RDC, -RDD, -WRC, -WRD, -XML, -XMH) for
interfacing to external memory. The memory control signals on the RSC-300/364 and the processor instruction
set provide independent Code and Data spaces, allowing configuration of systems up to 192 Kbytes with no
additional hardware decoding. The RSC-300/364 features 16 general-purpose I/O pins (Px.y) for product and
memory bank control.
PRE-AMP
EXTERNAL
MEMORY
INTERFACE
CPU
TIMING AND
CONTROL
32K x 8
32K x 8
HIGH
LOW
INTERNAL ROM (RSC-364)
A[15:0]
D[7:0]
-RDC
-WRD
-RDD
-WRC
448 bytes
8 levels
-XMH
-XML
-RESET
-TE1/
PWM
STACK SPACE
REGISTER SPACE
BREAK POINT
REGISTER
AiFE1
ANALOG
CONTROL
ADC
TIMER1
TIMER2
OSC1
OSC2
PO
R
T
0
I
N
TERRU
P
T
LOGI
C
DACOUT
XI1, XO1
XI2, XO2
P0.0-P0.7
P1.0-P1.7
DAC
PULSE
WIDTH
MODULATOR
PO
R
T
1
AOFE3
AiN1
AOFE2
AOFE1
AiN
AiFE2
PWM
BUFOUT/
SPEECH
PROCESSING
UNIT
2K TECHNOLOGY
SRAM
Figure 1 RSC-300/364 Block Diagram
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