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memory access device

A technology of memory access and memory, which is applied in the field of memory access devices, can solve the problems of inability to perform continuous burst access, additional time, etc., and achieve the effect of improving use efficiency and access efficiency

Active Publication Date: 2016-01-27
NTT ELECTORNICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0036] However, when the Bank addresses of adjacent units are the same, in continuous burst access, when the Row address changes, it is necessary to temporarily stop accessing and switch the Row address
Therefore, continuous burst access cannot be performed, and additional time is required for Row address switching

Method used

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Examples

Experimental program
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Embodiment Construction

[0136] In the memory access device according to the embodiment of the present invention, the image data accessed in one burst is not limited to the number of pixels in a power-of-2 unit, but the maximum access is performed. As an example, in the case of 10 bits / pixel, 256 bits / burst÷10 bits / pixel=25 pixels / burst. Therefore, the number of pixels per burst access is 25 pixels. A rectangular area having this 25 pixels is taken as a unit. As an example of a unit of 25 pixels, there is a unit of 5×5 pixels (horizontal 5 pixels×vertical 5 pixels). In an image frame of a common HD image, 384 cells are arranged horizontally and 216 cells are arranged vertically. The memory access device uses this unit to access SDRAM and read data.

[0137] The x and y of the pixel address Pix(x, y) of the HD image are in the range of x=0 to 1919 and y=0 to 1079, and can be represented by 11 bits, respectively. In addition, x and y of the address Cell(x, y) of the cell arranged in the HD image are...

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Abstract

The lookup table (10) outputs the result obtained by dividing the horizontal component of the pixel address of the block by the number of pixels of the horizontal component of the unit. The lookup table (12) outputs the result of dividing the vertical component of the pixel address of the block by the number of pixels of the vertical component of the unit. The lookup table (14) outputs the remainder when the horizontal component of the pixel address of the block is divided by the number of pixels of the horizontal component of the unit. The lookup table (16) outputs the remainder when dividing the vertical component of the block's pixel address by the number of pixels in the cell's vertical component. The output value of the look-up table (10, 12) is used as the address of the unit for the burst access to the memory. The output values ​​of the look-up tables (14, 16) are used as pixel addresses within the cell.

Description

technical field [0001] The present invention relates to a memory access device capable of improving memory usage efficiency and access efficiency even when the number of bits per pixel is not a power of 2. Background technique [0002] A memory access device is provided in the image processing device. When the image processing device performs image processing, the memory access device reads data from SDRAM (Synchronous Dynamic Random Access Memory: Synchronous Dynamic Random Access Memory) in which image frames are stored. When accessing SDRAM image data in an image processing device, generally a rectangular area is accessed. The rectangular area is set by the coordinates of the start point and the end point, or by the coordinates of the start point and the size (number of pixels) of the horizontal direction and the vertical direction of the rectangular area. [0003] Next, a conventional method of accessing SDRAM by a memory access device will be described. In the past, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/60G06F12/02H04N19/50
CPCG06T1/60H04N19/46H04N19/423H04N19/523G06F13/16G09G5/393G06F13/28
Inventor 山田恭裕永井律彦
Owner NTT ELECTORNICS CORP