NSAM266SA Datasheet, PDF (21/52 Pages) National Semiconductor (TI) – NSAM266SA CompactSPEECHTM Digital Speech Processor with Serial Flash Interface

2 0 Software
2 1 OVERVIEW
The CompactSPEECH software resides in the on-chip
ROM It includes DSP-based algorithms system support
functions and a software interface to hardware peripherals
2 1 1 DSP-based Algorithms
 Speech compression and decompression
 DTMF detector with echo canceler
 Energy-based busy and dial-tone detector
 Digital volume control
2 1 2 System Support
 Command interface to an external microcontroller
 Memory and message manager
 IVS support
 Tone generator
 Real-time clock handler
 Power-down mode support
2 1 3 Peripherals Support
 Serial flash interface (Master MICROWIRE handler)
 Microcontroller interface (Slave MICROWIRE handler)
 Codec interface
The following sections describe the CompactSPEECH soft-
ware in detail
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