NSAM266SA Datasheet | National

NSAM266SA pact SPEECH Digital Speech Processor with Serial Flash Interface March 1996 NSAM266SA pact SPEECH TM Digital Speech Processor with Serial Flash Interface General Description The NSAM266SA is a member of National Semiconductor’s pact SPEECH Digital Speech Processor family This processor provides Digital Answering Machine (DAM) functionality to embedded systems The pact SPEECH interfaces with National Semiconductor’s NM29A040 and NM29A080 Serial Flash memory devices to provide a cost-effective solution for DAM and Cordless DAM (CDAM) applications The pact SPEECH processor integrates the functions of a traditional Digital Signal Processing (DSP) chip and the CR16A a 16-bit general-purpose RISC core implementation of the pact RISCTM architecture It contains system support functions such as Interrupt Control Units Codec interface MICROWIRETM interfaces to a microcontroller and Serial Flash WATCHDOGTM timer and a Clock Generator The pact SPEECH processor operates as a slave peripheral that is controlled by an external microcontroller via a serial MICROWIRE interface In a typical DAM environment the microcontroller controls the analog circuits buttons and display and activates the pact SPEECH by sending it mands The pact SPEECH processor executes the mands and returns status information to the microcontroller The pact SPEECH firmware implements voice pression and depression tone detection and generation message storage management speech synthesis for timeand-day stamp and supports user-defined voice prompts in various languages The pact SPEECH implements echo-cancellation techniques to support high-quality DTMF tone detection during message playback The pact SPEECH can synthesize messages in various languages via the International Vocabulary Support (IVS) mechanism The NSAM266SA can store vocabularies on either Serial Flash or Expansion ROM memories DAM manufacturers can thus create machines that ‘‘speak’’ in different...