Winbond ISD-T360, User Manual

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2 Voice Solutions in Silicon™
ISD-T360 Reference Design User’s Guide
INTRODUCTION
Information Storage Device’s digital speech processor (DSP), the ISD-T360,
provides digital answering machine (DAM) functionality and full-duplex
speakerphone capabilities to embedded systems by integrating the function
of traditional DSP and a 16-bit, general purpose, RISC core. The DSP interfac-
es directly with codec circuitry and flash memory under the control of the
ISD-T360 processor, through a serial MICROWIRE interface. Thus, the DSP oper-
ates as a slave peripheral that receives commands from the external master
Winbond 89C51 processor. The ISD-T360 combined with a 16-Mbit flash
memory device can provide up to one hour of recording time.
The Winbond 89C51 is an 8-bit microcontroller providing 36 I/O pins for suffi-
cient interfacing with analog other than DSP circuitry. The processor manages
all of the I/O pins and time facilities throughout the entire system.
This reference design guide provides a basic working model for designing,
constructing and operating a fully-functional DAM using the ISD-T360 VoiceD-
SP processor. All required information is contained in these pages and on the
attached disk. If additional support is required, please email our product sup-
port department at apps@isd.com.