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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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ADV611 Arkusz danych(PDF) 2 Page - Analog Devices |
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ADV611 Arkusz danych(HTML) 2 Page - Analog Devices |
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2 / 46 page  ADV611/ADV612 –2– REV. 0 TABLE OF CONTENTS This data sheet gives an overview of the ADV611/ADV612’s functionality and provides details on designing the part into a system. The text of the data sheet is written for an audience with a general knowledge of designing digital video systems. Where appropriate, additional sources of reference material are noted throughout the data sheet. GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 COMPARING THE ADV6xx FAMILY VIDEO CODECS . . . . . 3 INTERNAL ARCHITECTURE . . . . . . . . . . . . . . . . . . . . . . . . 4 GENERAL THEORY OF OPERATION . . . . . . . . . . . . . . . . . . 4 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 THE WAVELET KERNEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 THE PROGRAMMABLE QUANTIZER . . . . . . . . . . . . . . . . . 8 THE RUN LENGTH CODER AND HUFFMAN CODER . . . . . 9 Encoding vs. Decoding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 PROGRAMMER’S MODEL . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 ADV611/ADV612 REGISTER DESCRIPTIONS . . . . . . . . . . 11 VIDEO AREA REGISTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 PIN FUNCTION DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . 18 Video Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Video Formats–CCIR-656 . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Host Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 DRAM Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Compressed Data-Stream Definition . . . . . . . . . . . . . . . . . . . 24 APPLYING THE ADV611/ADV612 . . . . . . . . . . . . . . . . . . . . 30 Using the ADV611/ADV612 in Computer Applications . . . . . . 30 Using the ADV611/ADV612 in Stand-Alone Applications . . . . 31 Connecting the ADV611/ADV612 to Popular Video Decoders and Encoders . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 GETTING THE MOST OUT OF ADV611/ADV612 . . . . . . . 32 How Much Compression Can Be Expected . . . . . . . . . . . . . . 32 Evaluation Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Software Codec . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Field Rate Reduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Edge Enhancement and Detection . . . . . . . . . . . . . . . . . . . . . 32 Motion Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 ADV611/ADV612 SPECIFICATIONS . . . . . . . . . . . . . . . . . . 33 TEST CONDITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 TIMING PARAMETERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Clock Signal Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 CCIR-656 Video Format Timing . . . . . . . . . . . . . . . . . . . . . . 35 Multiplexed Philips Video Timing . . . . . . . . . . . . . . . . . . . . . 37 Host Interface (Indirect Address, Indirect Register Data, and Interrupt Mask/Status) Register Timing . . . . . . . . . . . 40 Host Interface (Compressed Data) Register Timing . . . . . . . 42 ADV611/ADV612 LQFP PINOUTS . . . . . . . . . . . . . . . . . . . . 44 ADV611/ADV612 PIN CONFIGURATION . . . . . . . . . . . . . . 45 OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 GENERAL DESCRIPTION (Continued from page 1) ADV611/ ADV612 VIDEO CODEC CCTV DIGITAL VIDEO INTERFACE HOST INTERFACE DIGITAL VIDEO IN (ENCODE) DIGITAL VIDEO OUT (DECODE) COMPRESSED VIDEO OUT (ENCODE) COMPRESSED VIDEO IN (DECODE) STATUS AND CONTROL Figure 2. Functional Block Diagram The ADV611/ADV612 adheres to international standard CCIR-601 for studio quality digital video. The codec also sup- ports a range of field sizes and rates providing high performance in computer, PAL, NTSC, or still image environments. The ADV611/ADV612 is designed only for real-time interlaced video; full frames of video are formed and processed as two independent fields of data. The ADV611/ADV612 supports the field rates and sizes in Table I. Note that the maximum active field size is 720 by 288. The maximum pixel rate is 13.50 MHz. The ADV611/ADV612 has a generic 16-/32-bit host interface that includes a 512-position, 32-bit wide FIFO for compressed video. With additional external hardware, the ADV611/ADV612’s host interface is suitable (when interfaced to other devices) for moving compressed video over PCI, ISA, SCSI, SONET, 10 Base T, ARCnet, HDSL, ADSL and a broad range of digital inter- faces. For a full description of the Host Interface, see the Host Interface section. The compressed data rate is determined by the input data rate and the selected compression ratio. The ADV611/ADV612 can achieve a near constant compressed bit rate by using the current field statistics in the off-chip bin width calculator on the exter- nal DSP or Host. The process of calculating bin widths on a DSP or Host can be “adaptive,” optimizing the compressed bit rate in real time. This feature provides a near constant bit rate out of the host interface in spite of scene changes or other types of source material changes that would otherwise create bit rate burst conditions. For more information on the quantizer, see the Programmable Quantizer section. The ADV611/ADV612 typically yields visually loss-less com- pression on natural images at a 4:1 compression ratio. For more information on compression ratios, see the Getting the Most Out of the ADV611/ADV612 section. Desired image quality levels can vary widely in different applications, so it is advisable to evaluate image quality of known source material at different compression ratios to find the best compression range for the application. The subband coding architecture of the ADV611/ ADV612 provides a number of options to stretch compression performance. These options are outlined in the Applying the ADV611/ADV612 section. Table I. ADV611/ADV612 Field Rates and Sizes Active Active Total Total Standard Region Region Region Region Field Rate Pixel Rate Name Horizontal Vertical 1 Horizontal Vertical (Hz) (MHz) 2 CCIR-601/525 720 243 858 262.5 59.94 13.50 CCIR-601/625 720 288 864 312.5 50.00 13.50 NOTES 1The maximum active field size is 720 by 288. 2The maximum pixel rate is 13.5 MHz. |
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