Method and device for controlling data parallelly reading and writing of internal memory in decoding device

Abstract

The existing movement compensation video frequency decoding scheme based on macroblock tandemly reads external data and reads saved data for interpolation, and results in relatively large capacitance of on-chip storage device configured in video frequency decoding device and drop of decoding speed. The invention provides a method for controlling to write external data in on-chip storage device in parallel and for on-chip storage device reading the accessible data for decoding algorithm, its device capable of reducing capacitance and decoding time of on-chip storage device.

Description

technical field [0001] The invention relates to a data decoding device, in particular to a data reading and writing control method and device thereof in an on-chip storage device of the data decoding device. Background technique [0002] The current video decoding chip for macroblock-based motion compensation video decoding scheme is as follows: [0003] - Acquiring the information of a macroblock in the current image or the current frame (hereinafter referred to as "current block") from the decoded data, including the motion vector and the residual block data between the current block and the reference block in the original image. Wherein, the motion vector is used to indicate the relative position between the current block and the reference block of the corresponding macroblock in the reference frame. [0004] - Find the corresponding reference block data in the reference frame data of the off-chip storage device based on the motion vector, and read it into the on-chip st...

AI Technical Summary

Problems solved by technology

Therefore, whether it is the above-mentioned first method or the above-mentioned second method, the interpolation calculation cannot be performed while reading data from the off-chip storage device, and the off-chip storage device cannot be read at the same time as the interpolation calculation. , which increases the total time of reading and interpolation calculation in motion compensation, which leads to the increase of video decoding operation time

[0032] Especially in the second way, due to the increase in the number of times of reading, each reading needs to perform operations including requesting arbitration, activating memory rows, reading data, and closing the off-chip storage device, such as SDRAM. Read Latency

[0033] In the first way, although the encoded data of the image of the current macroblock in the off-chip storage device has been read once and stored in the internal memory of the decoding device, in order to completely preserve the encoded data of the image of the current macroblock , the memory used must be large enough, and the large-capacity memory will undoubtedly greatly increase the cost of the video decoding device

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