Winbond ISD-T360 User manual

1
ISD
ISD-T360 Reference Design
User’s Guide
For Digital Answering Machines
INCLUDED IN THIS REFERENCE DESIGN
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
SOFTWAREFLOWCHARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
OPERATING THE DAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
ACCESSING THE DAM REMOTELY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

2Voice 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 [e-mail].

3
ISD
ISD-T360 Reference Design User’s Guide
FEATURES
This reference design for a DAM using the ISD-T360 digital speech processor
not only contains basic answering machine features but also offers the fol-
lowing additional features:
•Features full-duplex speakerphone functionality
-Hands-free conversations between user and line user
•Supports 16m flash memory devices
-Samsung flash
-Interchangeable design possibilities
•Utilizes ISD’s International Vocabulary System (IVS) synthesized
speech application to generate voice prompts during operation
-Supports multiple languages
•Includes digital volume control for speakers
•Allows total remote control capabilities
•Operates at low power when idle

4Voice Solutions in Silicon™
ISD-T360 Reference Design User’s Guide
SCHEMATIC DIAGRAMS
The following schematic diagrams detail layout designs for the ISD-T360-based DAM.
Figure 1: Microphone and speaker circuitry

5
ISD
ISD-T360 Reference Design User’s Guide
Figure 2: CODEC Interface