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CS4923
Dolby(R) Digital Audio Decoder
The following information is based on technical datasheet:
CS4923 DS262PP1 AUG `97 Please contact Cirrus Logic: Crystal Semiconductor Products Division for further product information.
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Copyright (c) Cirrus Logic, Inc. 1998 (All Rights Reserved)
PI262PP2 JAN `98
CS4923
Features
Dolby(R) Digital Multi-Channel Audio Decoder
Features
q Dolby Digital, 5.1 Channel Decompression q Dolby(R) Surround Pro-LogicTM Decoder q Dolby Bass Manager & Cross-Over Filters q Flexible 6-Channel Master or Slave Output q IEC60958/61937 Transmitter Provides Compressed Data
or Linear PCM Output
q IEC60958/61937 Input for Compressed Data or Linear
PCM
q Large Variable Input and Output Buffers q DAC Clock via Analog Phase Locked Loop q Dedicated Byte or Serial Host Interface q Multiple Compressed Data Input Modes q PES Layer Decode for A/V Sync q 96 kHz Capable PCM I/O, Master or Slave q Optional External Memory and Auto Boot q +3.3 V CMOS Low Power, 44-Pin Package
Description
The CS4923 is the first device in a new family of higher performance digital audio decoders all targeted for multi-channel decompression like Dolby Digital, MPEG-2 Surround and DTS. The CS4923 is tailored to provide a complete and flexible solution for Dolby Digital audio decoding in products like: Laser
PI262PP2 JAN `98
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CS4923
Overview
Disc Players, DVD Movie Players, Stereo Receivers, Out-Board Decoders, HDTV Sets, Head-End Decoders and Set-Top Boxes. The CS4923 is a performance and feature enhanced version of the popular CS4922 audio decoder IC. A complete set of audio decoder and auxiliary audio DSP microcodes for various applications is provided through Cirrus Logic's Crystal Semiconductor Products Division. Also provided, for all complementary analog/digital audio I/O, is a complete set of high quality audio peripherals including: Multimedia CODECs, stereo A/D and D/A converters, SPDIF/IEC60958/61937 interfaces, wavetable and FM synthesizers. Of particular note is the CS4226 CODEC which provides in one chip: digital receiver, stereo A/D Converters and six 20-bit DAC's. Also available is the CRD4923, a reference design for CS4923 and CS4226.
RD, WR, SCDIO, DATA7:0, R/W, DS, SCDOUT, EMOE, EMWR, PSEL, A0, EMAD7:0, A1, ABOOT, EXTMEM, GPIO7:0 CS GPIO11 GPIO10 GPIO9 SCCLK SCDIN INTREQ GPIO8 Parallel or Serial Host Interface Framer Shifter Input Buffer Controller RAM Input Buffer 24-Bit DSP Processing RAM RAM Program Data Memory Memory ROM ROM Program Data Memory Memory STC Output Formatter DD DC MCLK SCLK RAM Output Buffer LRCLK AUDATA2.0 XMT958
RESET CMPDAT, RCV958, SDATAN2 CMPCLK, SCLKN2 CMPREQ, LRCLKN2 SCLKN1, STCCLK2 LRCLKN1 SDATAN1 CLKIN CLKSEL
Compressed Data Input Interface SPDIF Receiver Digital Audio Input Interface
PLL Clock Manager FILTD FILTS VDDA VSSA
VSS2:0 VDD2:0
Overview
The CS4923 has been carefully designed to completely support Dolby Digital audio decompression. In addition to the complete coverage and compliance of Dolby Digital decoding, the CS4923 is also well equipped with extra memory and reserve execution capacity necessary to cost reduce the entire Dolby subsystem including variable surround delays, bass output management, matrix encoding, matrix decoding, custom audio processing like 3-D positional, robust
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PI262PP2 JAN `98
CS4923
FAQs
error concealment, adjustable audio/video sync and bit accurate synchronous audio controller capability The major functional sub-blocks of the mixed signal chip are: Crystal's own audio quality 24-bit digital signal processing block, a configurable host interface, a flexible compressed data input interface, an auxiliary digital input interface, a multimode digital output controller and a programmable phase locked loop. The DSP processor section of the CS4923 accomplishes the Dolby Digital audio decoding and post processing with on-chip ROM and/or RAM based microcode supplied by Crystal. The microcode can be downloaded to the CS4923 in two fashions: manually via the host interface writing data into the device or automatically accessed by the CS4923 DSP from an external 8-bit memory if a serial host mode is selected. For complete information on the DSP microcode features and typical operation, see the CS4923 Dolby Digital Microcode Users Manual. In addition to the DSP processor the CS4923 is also equipped with a complete set of industry standard audio input/output interfaces. All of the interfaces are augmented with internal assist hardware and large configurable buffers to simplify and reduce the DSP intervention for directing the input and output of data and/or audio. To simplify host drivers and enable bursty high speed compressed data delivery from data demultiplexers a multi-channel 8Kbyte input buffer is provided. The CS4923 DSP and audio I/O can be clocked from a programmable analog phase locked loop for interfaces to external DACs and ADCs. In addition the phase locked loop can be driven from an internally recovered over-sampled clock from a single wire SPDIF input to perfectly match the output sample rate to the quantity of compressed data received and decoded.
FAQs
1) A: What kind of development boards are available for the CS4923? At this time there is a parallel strategy including the CDB4923 development board and the CRD4923 reference design. The CDB4923 is a traditional evaluation board that provides a means to fully exercise the featured IC in all of its modes. The CDB4923 utilizes discrete DACs, ADCs, and
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CS4923
Ordering Information
IEC958 digital interfaces all available from Crystal Semiconductor. The CRD4923 reference design utilizes the CS4226 multi-channel codec to form a two chip DSP and data conversion solution for home A/V products. 2) A: Do we have to have a Dolby license to get more information about the CS4923, CDB4923 or CRD4923? We can provide a data sheet without harm. Only Dolby qualified recipients are authorized to receive sample or production quantities of implementations containing Dolby Technology including Dolby Digital. If a customer is interested in developing a product containing Dolby technologies, they must contact Dolby laboratories and apply to become a licensee. All such requests should be faxed to Dolby Laboratories Corporation at (415)-8631373 and marked "Request for Dolby System License Application."
Ordering Information
CS4923-CL 44 PLCC
For further information on Crystal products, please visit our website "www.crystal.com" or call our literature department (800) 888-5016 ext. 3594 or (512) 912-3594 for data sheets and application notes.
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PI262PP2 JAN `98
Sales Office and Applications Support
UNITED STATES Sales Office and Applications Support: WESTERN AREA Cirrus Logic Crystal Semiconductor Div. 50 Airport Pkwy. San Jose, CA 95110 Ph: 408-437-7743 FAX: 408-437-4943
Cirrus Logic Crystal Semiconductor Div. 6 Venture, Ste. 100 Irvine, CA 92718 Ph: 714-453-5910 FAX: 714-453-5914
EUROPE Sales Office and Applications Support:
Cirrus Logic France Immeuble Andre Malraux 93561 Rosny s/s Bois CEDEX, France Ph: +33(148)122812 FAX: +33(148)122810 Cirrus Logic Crystal Semiconductor (UK) Ltd. Spectrum Point, 279 Farnborough Rd., Farnborough, Hampshire GU14 7LS, United Kingdom Ph: +44(0)1252372762 FAX: +44(0)1252372763 Cirrus Logic GmbH Muehlfelder-Strasse 2 D-82211 Herrsching, Germany Ph: +49(08152)92460 FAX: +49(08152)924699
KOREA Cirrus Logic, Korea Co., Ltd. Rm 1302 SangKyung Bldg., 82421 YeokSam-Dong, KangNam-Ku, Seoul, Korea Ph: +82(2)565-8561 FAX: +82(2)565-8565 SINGAPORE Cirrus Logic Crystal International 6 Kaki Bukit Ave. 1, Ste. 03-03 Singapore 417940 Ph: +65-743-4111 FAX: +65-742-4111 TAIWAN Cirrus Logic International Ltd. Taiwan Branch 10F, No.214 Tun Hwa North Rd. Taipei, Taiwan R.O.C. Ph: +886(2)2718-4533 FAX: +886(2)2718-4526
CENTRAL AREA Cirrus Logic Crystal Semiconductor Div. 14205 Burnet Rd., Ste. 400 Austin, TX 78728 Ph: 512-255-8893 FAX: 512-255-0733 EASTERN AREA Cirrus Logic Crystal Semiconductor Div. 5511 Capital Center Dr., Ste. 103 Raleigh, NC 27606 Ph: 919-859-5393 FAX: 919-859-5334
Cirrus Logic 10 New England Business Center, Ste. 100 Andover, MA 01810 Ph: 978-794-9138 FAX: 978-794-9998 Cirrus Logic Crystal Semiconductor Div. 10440 Little Patuxent Pkwy., Ste. 300 Columbia, MD 21044-3559 Ph: 410-740-5654 FAX: 410-740-6961
JAPAN FAR EAST Sales Office and Applications Support: CHINA Cirrus Logic International Ltd. A-1403, Qiancun Commercial Mansion Beijing, China 100029 Ph: (8610)6443-0783 Ph: (8610)6443-0784 Ph: (8610)6443-0785 FAX: (8610)6443-0786 HONG KONG Cirrus Logic International Ltd. 1203 Park Tower 15 Austin Rd., Tsimshatsui Kowloon, Hong Kong Ph: (852)2376-0801 FAX: (852)2375-1202 Sales Office and Applications Support: Cirrus Logic K.K. Shinjuku Green Tower, Bldg. 26F 6-14-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo, 160 Japan Ph: +81(03)3340-9111 FAX: +81(03)3340-9120
CRYSTAL SEMICONDUCTOR PRODUCTS DIVISION PO BOX 17847 4210 S. INDUSTRIAL DRIVE AUSTIN, TEXAS 78744 512.445.7222 / 800.888.5016 FAX: 512.445.7581 WORLDWIDE WEB: http://www.crystal.com

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