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ADV601JS Folha de dados(PDF) 2 Page - Analog Devices |
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ADV601JS Folha de dados(HTML) 2 Page - Analog Devices |
2 / 52 page ADV601 –2– REV. 0 TABLE OF CONTENTS This data sheet gives an overview of the ADV601 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 appropri- ate, additional sources of reference material are noted through- out the data sheet. GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 1 INTERNAL ARCHITECTURE . . . . . . . . . . . . . . . . . . . . . 3 GENERAL THEORY OF OPERATION . . . . . . . . . . . . . . . 3 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 THE WAVELET KERNEL . . . . . . . . . . . . . . . . . . . . . . . . . 4 THE PROGRAMMABLE QUANTIZER . . . . . . . . . . . . . . . 7 THE RUN LENGTH CODER AND HUFFMAN CODER . . 8 Encoding vs. Decoding . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 PROGRAMMER’S MODEL . . . . . . . . . . . . . . . . . . . . . . . . 8 ADV601 REGISTER DESCRIPTIONS . . . . . . . . . . . . . . . 10 PIN FUNCTION DESCRIPTIONS . . . . . . . . . . . . . . . . . 16 Video Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Host Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 DSP Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 DRAM Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Compressed Data-Stream Definition . . . . . . . . . . . . . . . . 26 APPLYING THE ADV601 . . . . . . . . . . . . . . . . . . . . . . . . . 32 Using the ADV601 in Computer Applications . . . . . . . . 32 Using the ADV601 in Stand-Alone Applications . . . . . . . 32 Connecting the ADV601 to Popular Video Decoders and Encoders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 GETTING THE MOST OUT OF ADV601 . . . . . . . . . . . 35 ADV601 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . 36 TEST CONDITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 TIMING PARAMETERS . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Clock Signal Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 CCIR-656 Video Format Timing . . . . . . . . . . . . . . . . . . . 38 Gray Scale/Philips Video Timing . . . . . . . . . . . . . . . . . . . 40 Multiplexed Philips Video Timing . . . . . . . . . . . . . . . . . . 43 Host Interface (Indirect Address, Indirect Register Data, and Interrupt Mask/Status) Register Timing . . . . . . . . 45 Host Interface (Compressed Data) Register Timing . . . . 47 DSP Interface Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 GENERAL DESCRIPTION (Continued from page 1) ADV601 LOW COST, MULTIFORMAT VIDEO CODEC VIDEO INTERFACE HOST INTERFACE DIGITAL VIDEO IN (ENCODE) DIGITAL VIDEO OUT (DECODE) COMPRESSED VIDEO OUT (ENCODE) COMPRESSED VIDEO IN (DECODE) STATUS & CONTROL Figure 1. Functional Block Diagram The ADV601 adheres to international standard CCIR-601 for studio quality digital video. The codec also supports a range of field sizes and rates providing high performance in computer, PAL, NTSC, or still image environments. The ADV601 is designed only for real-time interlaced video, full frames of video are formed and processed as two independent fields of data. The ADV601 supports the field rates and sizes in Table I. Note that the maximum active field size is 768 by 288. The maximum pixel rate is 14.75 MHz. The ADV601 has a generic 8-/16-/32-bit host interface, which includes a 512 position, 32-bit wide FIFO for compressed video. With additional external hardware, the ADV601’s host interface is suitable (when interfaced to other devices) for moving com- pressed video over PCI, ISA, SCSI, SONET, 10 Base T, ARCnet, HDSL, ADSL, and a broad range of digital interfaces. 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 ADV601 can achieve a near constant compressed bit rate by using the current field statistics in the off-chip bin width calculator on the external 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 ADV601 typically yields visually loss-less compression on natural images at a 4:1 compression ratio. 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 Table I. ADV601 Field Rates and Sizes Active Active Total Total Standard Region Region Region Region Field Rate Pixel Rate Name Horizontal Vertical1 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 Sq. Pixel/525 640 243 780 262.5 59.94 12.27 Sq. Pixel/625 768 288 944 312.5 50.00 14.75 NOTES 1The maximum active field size is 768 by 288. 2The maximum pixel rate is 14.75 MHz. |
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