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SDRAM address mapping and read-write rotation method for real-time interlaced and non-interlaced scanning

A technology of SDRAM2 and address mapping, applied in the field of electronic information

Inactive Publication Date: 2010-06-16
SHANGHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This will increase the overall clock frequency of the system, which will greatly increase the cost of system design, wiring and PCB production.

Method used

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  • SDRAM address mapping and read-write rotation method for real-time interlaced and non-interlaced scanning
  • SDRAM address mapping and read-write rotation method for real-time interlaced and non-interlaced scanning
  • SDRAM address mapping and read-write rotation method for real-time interlaced and non-interlaced scanning

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Embodiment Construction

[0043] A preferred embodiment of the present invention is described in detail as follows in conjunction with accompanying drawing:

[0044] In this embodiment, the field frequency of input video data is 50Hz, the resolution is 720×288, the scanning format is interlaced scanning, and the data unit is 16-bit YUV4:2:2 format, wherein Y is represented by 8-bit data, and UV is represented by 8-bit data. The bit data indicates that the frame frequency of the output video is 75Hz, the resolution is 720×576, the scanning format is progressive scanning, and the data unit format remains unchanged. The specifications of the selected SDRAM memory are 32 bits x 1024 rows x 256 columns x 4Bank.

[0045] Such as figure 1 As shown, each row of input video data is stored in the same row of SDRAM according to the number of rows in the video, and each row is stored starting from the starting column of Bank0 of the row of SDRAM in full-page write mode, and the 256 columns are about to be full ...

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Abstract

The invention relates to a method of SDRAM address mapping and reading and writing alternation with real-time interlaced-progressive conversion applied to videos. The invention adopts a new address mapping method to store inputted videos to corresponding positions in each interval of an SDRAM and synchronously reads necessary data of each line in the interlaced-progressive conversion process to take part in the motion detection and the interpolation operation by a new tri-chip reading and writing alternation method, which results in that progressive videos after the conversion can be continuously outputted while the interlaced videos are continuously inputted and no conflict occurs during the writing and reading of each SDRAM and the necessary data for the two-line operation can be read ina full-page mode, which greatly improves the bus efficiency of the SDRAM.

Description

technical field [0001] The invention relates to a method for SDRAM address mapping and read-write rotation, in particular to a method for SDRAM address mapping and read-write rotation for real-time interlaced-progressive conversion. It belongs to the field of electronic information. Background technique [0002] Today, with the rapid development of digital video display technology, on the one hand, progressive scan, large screen, and high-definition display are gradually popularized. On the other hand, traditional interlaced video is still widely used in daily life and work. Therefore, converting an interlaced video signal to a progressive video format has great market value. [0003] The principle of interlaced-progressive conversion is to obtain the other half of the missing information through interpolation calculation on the basis of the original interlaced image sequence, making it a progressive image sequence. The specific methods include simple time-domain interpola...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/14H04N7/01
Inventor 郭众磊陆小锋黄美彬张颖金臻
Owner SHANGHAI UNIV