PRELIMINARY
November 1995
NSAM265SR/NSAM265SF
CompactSPEECHTM Digital Speech Processors
General Description
Features
Y
Designed around National’s 16-bit CompactRISC proc-
essor
The NSAM265SR and the NSAM265SF are members of
National Semiconductor’s CompactSPEECH, Digital
Speech processors family. These processors provide Digital
Answering Machine (DAM) functionality to embedded sys-
tems. Both processors are based on the NSAM265.
Y
Y
Y
16-bit architecture and implementation
20.48 MHz operation
On-chip DSP Module (DSPM) for high speed DSP
operations
Unless specified otherwise, all references to the Compact-
SPEECH processor in this document apply to both the
NSAM265SR and the NSAM265SF.
Y
Y
Y
Y
Y
On-chip Codec clock generation and interface
Power-down mode
The CompactSPEECH processor integrates the functions of
a traditional Digital Signal Processing (DSP) chip and a 16-
bit CompactRISCTM embedded Risc processor core. The
device contains system support functions such as DRAM
Controller, Interrupt Control Unit, Codec Interface, MI-
CROWlRETM interface, WATCHDOGTM timer and a Clock
Generator.
MICROWIRE interface to an external microcontroller
Storage and management of messages
Programmable message tag for message categoriza-
tion, e.g., Mailboxes, InComing Messages (ICM), Out-
Going Messages (OGM)
Y
Y
Y
Skip forward or backward during message playback
Variable speed playback
The CompactSPEECH processor operates as a slave pe-
ripheral that is controlled by an external microcontroller via
a serial MICROWIRE interface. In a typical DAM environ-
ment the microcontroller controls the analog circuits, but-
tons and display, and activates the CompactSPEECH by
sending it commands. The CompactSPEECH processor ex-
ecutes the commands and returns status information to the
microcontroller.
Built-in vocabulary for speech synthesis, and support
for external vocabularies. using expansion ROM
Multi-lingual speech synthesis using International Vo-
cabulary Support (IVS)
Y
Y
Y
DTMF and single tone generation and detection
DTMF tone detection during OutGoing Message play-
back
Y
Telephone line functions, including busy and dial tone
detection
The CompactSPEECH firmware implements voice compres-
sion and decompression, tone detection and generation,
message storage management, on-chip speech synthesis
for time and day stamp, and support for user-defined voice
prompts in various languages.
Y
Y
Y
Y
Real-time clock
Direct access to message memory
Supports long-frame and short-frame codecs
Available in PLCC 68-pin, and PQFP 100-pin packages
The NSAM265SR CompactSPEECH supports DRAM/
ARAM for message storage while the NSAM265SF sup-
ports FLASH/AFLASH. In all other respects, the processors
are identical.
NSAM265SR only
Y
On-chip ARAM/DRAM Controller for 4-Mbit (1M x 4)
and 16-Mbit (4M x 4) devices
The CompactSPEECH implements echo cancellation tech-
niques to support improved DTMF tone detection during
message playback.
Y
15 minutes recording on a 4-Mbit ARAM
Y
Supports various ARAM configurations. No glue logic
required
The CompactSPEECH supports speech synthesis: the tech-
nology used to create voice prompts from predefined words
and phrases stored in a vocabulary.
Y
Storage of up to 1600 messages
Y
Production diagnostics support
NSAM265SF only
The CompactSPEECH can synthesize messages in various
languages, in addition to the on-chip English vocabulary, via
the International Vocabulary Support (IVS) mechanism. Syn-
thesized messages can be stored on an external ROM. One
ROM can contain several vocabularies in various lan-
guages. The NSAM265SF can also store vocabularies on
FLASH memory. DAM manufacturers can thus create ma-
chines that ‘‘speak’’ in different languages, simply by using
other vocabularies. For more details about IVS, refer to the
IVS User’s Manual.
Y
Supports 4-Mbit and 8-Mbit, byte wide, FLASH/
AFLASH devices
Y
Up to 15 minutes recording on a 4-Mbit FLASH
Y
Supports various AFLASH configurations. No glue logic
required for a single AFLASH configuration
Y
The number of messages that can be stored is limited
only by memory size
Y
Supports prerecorded IVS and OGM on FLASH
TRI-STATEÉ is a registered trademark of National Semiconductor Corporation.
CompactSPEECHTM, CompactRISCTM, MICROWIRETM and WATCHDOGTM are trademarks of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation
TL/EE12378
RRD-B30M115/Printed in U. S. A.
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