原标题：Cirrus CS4953xx多标准音频处理和后处理解决方案

　　Cirrus公司的CS4953xx是32位音频DSP系列,工作频率150MHz,在片内的ROM中包括所有主流音频处理代码,从而节省了外接存储器和代码存储.不需要昂贵的外接SDRAM存储器就能完成Dolby数字环绕EX®, AAC多路, DTS-ES 96/24, THX Ultra2影院和Dolby耳机的译码任务,是下一代音频解决方案.本文介绍了CS4953xxx系列主要特性,方框图,CDB49x主板框图和相应的元件,DC4953x子板框图和相应的元件以及板的建立和连接图.

　　The CS4953xx DSP family are the enhanced versions of the CS495xx DSP family with higher overall performance and lower system cost. The CS4953xx includes all mainstream audio processing codes in on-chip ROM. This saves external memory for code storage. In addition, the intensive decoding tasks of Dolby Digital Surround EX®, AAC multi-channel, DTS-ES 96/24, THX Ultra2 Cinema and Dolby Headphone can be accomplished without the expense of external SDRAM memory.

　　With larger internal memories than the CS495xx, the CS49531x is designed to support up to 150 ms per channel of lip-sync delay. With 150 MHz internal clock speed, the CS4953xx supports the most demanding post-processing requirements. It is also designed for easy upgrading.

　　Customers currently using the CS495xx can upgrade to the CS4953xx with minor hardware and software changes The CS4953xx DSP Family, together with Cirrus Logic’s comprehensive library of audio processing algorithms enables the development of next-generation audio solutions. There are two classes of devices in the CS4953xx DSP family:

　　• CS4953x3 Class (ROM ID 3), comprising the CS495303 and the CS495313

　　• CS4953x4 Class (ROM ID 4), comprising the CS495304 and the CS495314

　　The primary difference between the CS4953x3 and the CS4953x4 classes is the support of the DSP Condenser application on the CS4953x4 class of products only. The DSP Condenser is a tool set that enables the DSP to automatically boot and configure itself from an external serial FLASH, thus reducing the traditional heavy loading on the part of the system microcontroller.

　　CS4953xxx系列主要特性:

　　 Multi-standard 32-bit Audio Decoding plus Post processing

　　 Supports legacy audio formats and a wide array of postprocessing

　　— Dolby Digital® EX, Dolby Pro Logic® II, IIx, IIz 7.1,Dolby Headphone® 2, Dolby Virtual Speaker® 2,Dolby Volume® (original), Dolby Volume 258™ (lite),Audistry®

　　— DTS-ES 96/24™ Discrete 7.1, DTS-ES™ Discrete 7.1,DTS-ES™ Matrix 6.1, DTS Neo:6®, DTS Neural Surround™ DTS Surround Sensation Speaker

　　— MPEG-2 AAC™ LC 5.1

　　— SRS® Circle Surround® II, SRS Circle Surround Auto,SRS Circle Surround Decoder Optimized, SRS TruVolume™ 7.1 (V 2.1.0.0), SRS TruSurround HD/HD4®, SRS WOW HD™, SRS CS Headphone™, SRS Circle Cinema 3D™, SRS Studio Sound HD™

　　— THX® Ultra2™, THX Select2™

　　 Cirrus Logic’s Applications Library

　　— Cirrus Original Multi-Channel Surround 2 (COMS2), Cirrus Band XpandeR™, Cirrus Virtualization Technology (CVT), Cirrus Intelligent Room Calibration 2 (IRC2), Cirrus Bass Enhancement (CBE)

　　— Crossbar Mixer, Signal Generator

　　— Advanced Post-Processors including: 7.1 Bass

　　Manager Quadruple Crossover, Tone Control, 11-Band Parametric EQ, Delay, 2:1/4:1 Decimator, 1:2/1:4 Upsampler

　　 Up to 12 Channels of 32-bit Serial Audio Input

　　图1.CS4953x4功能框图

　　图2.CDB49x主板外形图

　　图2 CDB49x主板对应的元件:

　　1. LCD

　　2. HDMI Receiver (Rx)

　　3. Extended Display Identification Data (EDID) Programming Header

　　4. HDMI Input Connector

　　5. Hot Plug Indicator

　　6. HDMI Transmitter (Tx)

　　7. HDMI Output Connector

　　8. S/PDIF Optical Tx

　　9. S/PDIF Coax Rx

　　10. S/PDIF Optical Rx

　　11. +5V Header

　　12. +1.8V Header

　　13. Dual Zone Analog Outputs

　　14. Headphone Output

　　15. Main Analog Line-Level Outputs (Left/Right; Left Surround/Right Surround; Center/Subwoofer;Surround Back Left/Surround Back Right)

　　16. Cirrus Logic CS42528 CODEC

　　17. Cirrus Logic CS2000 Clock Generator and Clock Multiplier/Jitter-Reduced Clock Frequency Synthesizer

　　18. DAO Selection

　　19. Analog Line-Level Input

　　20. Mic Input

　　21. Power Indicator LEDs (4)

　　22. Slave Boot Control

　　23. Power Switch

　　24. +9V Power Connector

　　25. DAO Mux Header

　　26. +3.3V Header

　　27. Daughter Card Connectors (2)

　　28. DAI 1, 2, and 3 Header

　　29. DSD/I2S Mux LED

　　30. MCU Programming Header (C2 Header)

　　31. USB Connector

　　32. USB Active LED

　　33. 8051 MCU

　　34. IR Receiver

　　35. System Reset

　　36. Rotary Encoder Knob

　　37. MCU Buttons (4) (Menu, Left, Right, Exit)

　　38. MCU LEDs (4)

　　图3. DC4953x/DC4953x3/DC4970x4子板外形图

　　DC4953x子板对应的元件:

　　1. Cirrus Logic CS4953x DSP (U1)

　　2. 24.576 MHz Crystal (Y1)

　　3. Debug Header (P5)

　　4. ESMT 16-Mbit SDRAM (U2)

　　5. Power LEDs (2)

　　图4.CDB49x主板框图

　　图5.DC4953x 子板框图

　　图6.板的建立和连接图