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YSS920B
EVE
32-bit DSP Engine for Various sound Effects
„ Outline
YSS920B is a 32-bit digital signal processor exclusively designed for sound field processing. As a
post-processing DSP after surround sound decoding, YSS920B can process various sound fields such as
various simulation surround and virtual surround through user programs, which can provide wide
variation of sound field effects on audio equipments.
„ Features
YSS920B has following features:
Basic compatibility with the SubDSP section of YSS922/932 for DSP program
High precision processing by 32-bit floating-point operation
Capability to process various sound effects by downloading external programs to the built-in RAM
16 channels processing capability (input: 16ch, output: 16ch)
Zero data detecting function on each channel
32-bit data transmission ability between multiple YSS920Bs
Connectability to most types of ADC, DAC and DIR through control register setting
Built-in delay memory with 32 bits × 1024 words (Max. 21.3 ms at fs = 48 kHz)
Ability to execute up to 2.73 seconds delay (at fs = 48 kHz) when connected with an external DRAM or
SRAM
Support for sampling frequencies from 32 kHz to 192 kHz
DSP section specifications
Internal operating frequency: 30.72 to 50.00 MHz
Data bus width: 32 bits
MAC: 32 bits (floating-point) × 16 bits (fixed-point) + 49 bits 49 bits
Program RAM: 50 bits × 1024 words
Coefficient RAM: 16 bits × 1024 words
Ability to use up to 20 general-purpose input/output terminals
Power supply voltage: 2.5 V (for internal and PLL circuits), 3.3 V (for I/O)
Si-gate CMOS process
Lead-free 100-pin SQFP package:YSS920B-SZ
www.DataSheet4U.com
YSS920B CATALOG
CATALOG No.: LSI-4SS920B21
2006.8

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YSS920B
„ Application
Sound field processing for AV amplifiers and audio mixers such as:
1) Simulation surrounds for Hall, Theater, Church, Stadium, Disco, Jazz, and Live
2) Virtual surround
3) Bass Management
4) Filtering process for LPF, HPF, equalizer, etc.
5) Fader and Level meters
6) Generating white noise, pink noise, sine waves, etc.
„ Difference between YSS920B and YSS920
The principal differences are as follows. Please sufficiently check that no problem occurs in your
product when you replace YSS920 by YSS920B.
Item
YSS920B
YSS920
1 Internal operating frequency
30.72 to 50.00MHz
30.72 to 40.96MHz
2 Power consumption (VDD1)
45mW (typ) / 65mW (max)
30mW (typ) / 45mW(max)
3 Power consumption (VDD2/AVDD) 120mW (typ) / 145mW (max) 80mW (typ) / 115mW (max)
4 Power supply start-up order)
Defined (see p18 Power-on)
Undefined
2

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YSS920B
„ Block Diagram
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