NSAM265SR Datasheet, PDF (1/58 Pages) National Semiconductor (TI) – CompactSPEECH Digital Speech Processors

PRELIMINARY
November 1995
NSAM265SR NSAM265SF
CompactSPEECH^TM Digital Speech Processors
General Description
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
Unless specified otherwise all references to the Compact-
SPEECH processor in this document apply to both the
NSAM265SR and the NSAM265SF
The CompactSPEECH processor integrates the functions of
a traditional Digital Signal Processing (DSP) chip and a 16-
bit CompactRISC^TM embedded Risc processor core The
device contains system support functions such as DRAM
Controller Interrupt Control Unit Codec Interface MI-
CROWlRE^TM interface WATCHDOG^TM timer and a Clock
Generator
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
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
The NSAM265SR CompactSPEECH supports DRAM
ARAM for message storage while the NSAM265SF sup-
ports FLASH AFLASH In all other respects the processors
are identical
The CompactSPEECH implements echo cancellation tech-
niques to support improved DTMF tone detection during
message playback
The CompactSPEECH supports speech synthesis the tech-
nology used to create voice prompts from predefined words
and phrases stored in a vocabulary
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
Features
Y _{Designed around National’s 16-bit CompactRISC proc-}
essor
Y _{16-bit architecture and implementation}
Y _{20 48 MHz operation}
Y _{On-chip DSP Module (DSPM) for high speed DSP}
operations
Y _{On-chip Codec clock generation and interface}
Y _{Power-down mode}
Y _{MICROWIRE interface to an external microcontroller}
Y _{Storage and management of messages}
Y _{Programmable message tag for message categoriza-}
tion e g Mailboxes InComing Messages (ICM) Out-
Going Messages (OGM)
Y _{Skip forward or backward during message playback}
Y _{Variable speed playback}
Y _{Built-in vocabulary for speech synthesis and support}
for external vocabularies using expansion ROM
Y _{Multi-lingual speech synthesis using International Vo-}
cabulary Support (IVS)
Y _{DTMF and single tone generation and detection}
Y _{DTMF tone detection during OutGoing Message play-}
back
Y _{Telephone line functions including busy and dial tone}
detection
Y _{Real-time clock}
Y _{Direct access to message memory}
Y _{Supports long-frame and short-frame codecs}
Y _{Available in PLCC 68-pin and PQFP 100-pin packages}
NSAM265SR only
Y _{On-chip ARAM DRAM Controller for 4-Mbit (1M x 4)}
and 16-Mbit (4M x 4) devices
Y _{15 minutes recording on a 4-Mbit ARAM}
Y _{Supports various ARAM configurations No glue logic}
required
Y _{Storage of up to 1600 messages}
Y _{Production diagnostics support}
NSAM265SF only
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-STATE is a registered trademark of National Semiconductor Corporation
CompactSPEECHTM CompactRISCTM MICROWIRETM and WATCHDOGTM are trademarks of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL EE12378
RRD-B30M115 Printed in U S A