JP2917285B2 - Image memory device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image memory device, and more particularly to a CPU (Centra Processing Unit) for writing or reading an address of image data in an image memory constituting an image memory device.
The present invention relates to an image memory device for converting a nit) into a double-buffered memory into which conversion data is written and supplying the converted data to an image memory.

[Conventional technology]

In a conventional image memory device, a write address or a read address of image data in an image memory is configured to be semi-fixedly given by a counter and an arithmetic circuit.

[Problems to be solved by the invention]

In the above-described conventional image memory device, the write address or read address of the image data in the image memory is semi-fixed by the counter and the arithmetic circuit, so that the address configuration cannot be freely changed. .

The present invention has been made in view of such circumstances,
It is an object of the present invention to provide an image memory device capable of freely changing the address configuration of a write address or a read address of image data in an image memory.

[Means for solving the problem]

In the present invention, (a) first and second address generating means for generating independent addresses, and (b) using the first address generated by the first address generating means as a write address And (c) a first image memory for converting the first address generated by the first address generating means into a first read address for reading the image data. A first conversion data storage memory for storing the first conversion data when it is supplied; (d) the first conversion data storage memory;
(E) first image data reading means for reading image data from the first image memory using the first read address obtained by using the first conversion data stored in the conversion data storage memory of (e); A second image memory for writing image data read from the first image memory;
(F) When the second converted data for creating the write address used for writing the image data in the second image memory from the second address generated by the second address generating means is supplied. A second conversion data storage memory for storing the data, and (g) a second conversion data obtained by converting the image data read by the image data reading means by the second conversion data stored in the second conversion data storage memory. Image data writing means for writing to the second conversion data storage memory using the address of (h), and (h) image data written to the second conversion data storage memory for the second conversion data generated by the second address generation means. The image memory device is provided with second image data reading means for reading using the above address, and (c) a CPU for outputting the first and second converted data.

According to the present invention, a pair of conversion data storage means capable of writing, from a CPU, first and second conversion data for converting a write address or a read address of image data in a first or second image memory. When writing conversion data from the CPU to the pair of conversion data storage means and writing image data to or reading image data from the first and second image memories, one of the pair of conversion data storage means is provided. Since the write address or read address of the image data output from the first or second address generation means is converted by one of the conversion data storage means, the write address or the read address can be reduced using a small number of address generation means. The address structure of the address can be freely changed.

In addition, since two address generating means, ie, first and second address generating means, are prepared, the order of reading or writing of image data is changed so that the display on the screen of a display device connected to the outside of the image memory device can be performed. In addition, effects such as horizontal reversal, vertical reversal, rotation, and position movement of an image can be obtained.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows the configuration of an embodiment of an image memory device according to the present invention. In the figure, the image memory device according to the present invention is provided with two image memories 10 and 20. The image memory 10 writes or reads image data based on a write address or a read address output from the address generator 11. Also, 12, 13
Is a RAM (random access memory) in which conversion data for address conversion is written by the CPU 30. Reference numeral 14 denotes an analog switch that is switched by a read / write selection signal (hereinafter, referred to as a selection signal) output from the address generator. The analog switches 15, 16, and 17 are switched and controlled by a switching signal output from a register 28. You.

Similarly, the image memory 20 writes or reads the image data read from the image memory 10 based on the write address or the read address output from the address generator 21.

In the RAMs 22 and 23, similarly to the RAMs 12 and 13, conversion data for address conversion is written by the CPU 30. The analog switch 24 is switched by a selection signal output from the address generator 21 similarly to the analog switch 14. Analog switch 25, 26, 27
Are controlled by a switching signal output from the register 28 in the same manner as the analog switches 15, 16, and 17.

In the register 28, one of the RAM 12 and the RAM 13 is connected between the read address output terminal RADR of the address generator 11 and the address input terminal ADR of the image memory 10, and the RAM 12
Either 22 or RAM 23 is used as the write address output terminal WADR of the address generator 21 and the address input terminal of the image memory 20.
Analog switch 15, 1 to connect between ADR
Data for switching among 6, 17, 25, 26, and 27 is written from the CPU 30.

The analog switches 14 and 24 are switched to the contact a side during writing and to the contact b side during reading.

In the configuration described above, the input terminal 10 of the image memory device
When image data is input from 0, the address generator 11
A selection signal is output from the terminal R / W SEL to the analog switch 14, and the analog switch 14 is switched to the contact a side. At this time, the write address is output from the write address output terminal WADR of the address generator 11 to the address input terminal ADR of the image memory 10 via the analog switch 14, and as a result, the image is output to a predetermined address of the image memory 10. Data is written.

On the other hand, when reading image data from the image memory 10, the analog switch 14 switches to the state shown in FIG. At this time, the analog switches 15, 16, and 17 are assumed to be in the state shown in FIG. 1, for example. Where RA
A conversion address for converting the address is written in M12 in advance by the CPU 30.

When the image data is read from the image memory 10, the read address output from the read address output terminal RADR of the address generator 11 is read by the analog switch 16 via the analog switch 16.
Input to M12. In the RAM 12, the input read address is converted based on the conversion data written in advance, and the converted read address is
The image data is input to the address input terminal ADR of the image memory 10 via 5 and 14, and the image data in the memory area specified by the read address is read from the image memory 10 and output to the image memory 20.

On the other hand, the write address output from the write address output terminal WADR of the address generator 21 is input to the RAM 22 via the analog switch 26.

Note that a conversion address for converting the address is previously written in the RAM 22 by the CPU 30. In the RAM 22, the input write address is converted based on the previously written conversion data, and the converted write address is input to the address input terminal ADR of the image memory 20 via the analog switches 25 and 24. Then, the image data read from the image memory 10 is written into the memory area of the image memory 20 specified by the write address.

When reading image data from the image memory 20, a selection signal is output from the terminal R / W SEL of the address generator 21 to the analog switch 24, and the analog switch 24 is switched to the contact b side. At this time, the address generator
The read address is output from the read address output terminal RADR of the image memory 20 to the address input terminal ADR of the image memory 20 via the analog switch 24. As a result, image data is read from a predetermined address of the image memory 20, and the output terminal 101 Image data is output to the outside.

When the read address of the image memory 10 and the write address of the image memory 20 are to be changed, the conversion data to be written to the RAM 13 and the RAM
The PU 30 writes the switching data of the analog switch group to the register 28, so that the analog switches 15, 16, 17, 2
5, 26 and 27 are switched in the opposite direction to the side shown in FIG. As a result, conversion data for converting the read address of the image memory 10 and the write address of the image memory 20 is changed.

〔The invention's effect〕

As described above, in the present invention, the first and second conversion data for converting the write address or the read address of the image data in the first or second image memory are converted into a pair of conversion data that can be written by the CPU. A data storage means is provided, and the conversion data is written from the CPU to the pair of conversion data storage means. When the image data is written to or read from the first and second image memories, a pair of conversion data storage means is provided. Is configured to convert the write address or the read address of the image data output from the first or second address generating means by either one of the converted data storing means. The address configuration of the address or the read address can be freely changed.

In addition, since two address generating means, ie, first and second address generating means, are prepared, the order of reading or writing of image data is changed so that the display on the screen of a display device connected to the outside of the image memory device can be performed. In addition, effects such as horizontal reversal, vertical reversal, rotation, and position movement of an image can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of an image memory device according to the present invention. 10, 20, image memory, 11, 21, address generator, 12, 13, 22, 23, RAM, 28, register, 30 CPU.

Claims (1)

(57) [Claims] A first and a second address generating means for generating an independent address; and a first address generated by the first address generating means being used as a write address to write image data. And a first conversion data for converting a first address generated by the first address generation means into a first read address for reading the image data. A first conversion data storage memory for storing the first conversion data when the first conversion data is stored in the first conversion data storage memory, and a first read address obtained by using the first conversion data stored in the first conversion data storage memory. First image data reading means for reading image data from the image memory, and writing the image data read from the first image memory. A second image memory, and second conversion data for creating a write address used when writing image data into the second image memory from the second address generated by the second address generation means. And a second conversion data storage memory for storing the image data when supplied. The image data read by the image data reading means is converted by the second conversion data stored in the second conversion data storage memory. Image data writing means for writing to the second converted data storage memory using the second address, and image data written to the second converted data storage memory generated by the second address generating means. A second image data reading means for reading using a second address; and a CPU for outputting the first and second converted data. Image memory apparatus that.