INTRODUCTION

The YSS902 is one chip LSI consisting of two built-in DSP’s ; Dolby Digital (AC-3) / Pro Logic (Main DSP) and a sound processing DSP (Sub DSP). Sub DSP is capable of realizing various sound fields, such as virtual surround, by down-loading the program and coefficient.

FEATURERS

● Dolby Digital 5.1 channel full decode.

● 24 bit DSP. (Group-A Dolby Digital decoder)

● No external memory is required. (Memory for center and surround channel delay is included)

● Possible to decode multi-language encoded data. (possible to decode based on data-stream-number)

● AC-3 karaoke mode.

● Original compression mode as well as four compression modes recommended by Dolby.

● Dolby Digital decoding latency is fixed to two audio blocks (512 samples).

● Included de-emphasis filter.

● Pro Logic decoding for Dolby Digital 2 channels decoded signal as well as ordinary PCM.

● High performance 25 MIPS programmable DSP suitable for a variety of sound field processing such as original surround, filtering, virtual surround etc.

● Up to 1.36 second delay time is capable when used with an external 1Mbit SRAM. (at fs= 48 kHz)

● Reads Dolby Digital decode information through the microprocessor interface.

● Provide total sixteen I/O ports.

● Possible to connect most of SPDIF receivers, A/D and D/A converters, by setting I/O data interface format.

● Has a built-in PLL oscillation circuit to generates its own operating clock.

● Internal operating clock is 25MHz.

● Supply Voltage: 3.3v for core logic. 5v for I/Os.

● Power saving mode.

● Si-gate CMOS process.

● 100 QFP.(YSS902-F)