Cirrus公司的CS4953xx是32位音頻DSP系列,工作頻率150MHz,在片內的ROM中包括所有主流音頻處理代碼,從而節省了外接存儲器和代碼存儲.不需要昂貴的外接SDRAM存儲器就能完成Dolby數字環繞EX®, AAC多路, DTS-ES 96/24, THX Ultra2影院和Dolby耳機的譯碼任務,是下一代音頻解決方案.本文介紹了CS4953xxx系列主要特性,方框圖,CDB49x主板框圖和相應的元件,DC4953x子板框圖和相應的元件以及板的建立和連接圖.

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

圖1.CS4953x4功能框圖

圖2.CDB49x主板外形圖

圖2 CDB49x主板對應的元件:

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)


圖3. DC4953x/DC4953x3/DC4970x4子板外形圖

DC4953x子板對應的元件:

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)

圖4.CDB49x主板框圖

圖5.DC4953x 子板框圖

圖6.板的建立和連接圖
詳情請見:
http://www.cirrus.com/en/pubs/proDatasheet/CS4953xx_F2.pdf
和
http://www.cirrus.com/en/pubs/manual/CK49x_UM_CK5.pdf