Data transfer apparatus

Abstract

The present invention provides a buffer between the image processing device, the image input / output device, and a shared memory shared and accessed by them, controls the use of the buffer only for a specific access, and controls data transfer to the shared memory. For a single transfer request from the image processing device and a burst transfer request from the image input-output device, a single transfer data is held in the buffer, and the selector is controlled so as to perform burst transfer to the memory.

Description

technical field [0001] The present invention relates to a data transmission device, and more particularly to a data transmission device capable of handling data transmission between a plurality of functional processing devices and shared resources shared and accessed by a plurality of functional processing devices with less hardware. Background technique [0002] In addition to performing data processing, it is used in various systems as a system in which a plurality of functional processing devices access a common resource. [0003] As a first example, there is a graphics system that shares a frame memory. In this graphics system, there are cases where the rendering processing device writes image bitmap data into a specific area of ​​the frame memory, and the video controller periodically reads out the frame memory. In this case, the rendering processing device performs image generation processing for expressing a so-called line or polygonal object. T...

AI Technical Summary

Problems solved by technology

[0014] First, because each functional processing device has a buffer structure, the scale of hardware is too large

In addition, when the transfer unit from a specific function processing device to the buffer becomes the number of words that is lower than the capacity of the buffer, or the access frequency becomes low, the use efficiency of the specific buffer becomes low.

[0015] The 2nd, because in the data transmission between a plurality of functional processing devices and the shared memory accessed from a plurality of functional processing devices, data transmission must be performed via a buffer, so extra consumption is generated when accessing, and I cannot perform high-speed access

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