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)