JPH04153846A - Storage device - Google Patents

Abstract

PURPOSE:To write and read picture element data instantaneously in both normal and 90 deg. rotation modes by performing arithmetic for an address and a data bus and arranging the picture element data which continue in both raster scanning directions of the normal and 90 deg. rotation modes on different device. CONSTITUTION:The address bus and data bus are provided with arithmetic units 4 and 5 and the picture element data continue in the raster scan data directions of both the normal and 90 deg. rotation modes. The picture element data are arranged dispersedly in dot addresses of a memory device 1 so that the one-bit picture element data can be written and read on the different data buses. The picture element data which are read out continuously are stored on different memory devices in the memory device 1. Consequently, a raster scan display is easily made while turned by 90 deg. and the processing time up to the output of 90 deg.-rotated raster scan data is shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a storage device for storing raster scan data to be output to an output device such as a printer used in an information processing device or the like.

Conventional technology FIG. 3 shows the configuration of a conventional storage device.

As shown in FIG. 3, as a component, 1 is a memory device, which stores raster scan data. A display control device 2 generates an address for outputting raster scan data. 3 is a parallel/serial data conversion device, which converts parallel data output from the memory device 1 into serial data. Reference numeral 7 denotes an address bus, which is connected to the memory device 1 and the display control device 2. A data bus 10 is connected to a memory device 19, a display control device 2, and a parallel/'serial data conversion device 3. Reference numeral 6 denotes an output signal line, which is connected to the parallel/serial data converter 3.

Next, the raster scan data for one line, that is, for one scan, to explain mutual malfunctions of the components in the conventional example is placed at consecutive addresses, and the display control device 2 sends consecutive addresses to the address bus 7 one after another. The memory device 1 outputs raster scan data to the data bus 10 for each address, and with this as input, the parallel/serial data converter 3 converts the parallel data into a serial data signal always in the same order, The signal is generated on the output signal line 6.

However, for certain purposes, instead of simply outputting raster scan data as serial data, it may be necessary to output raster scan data rotated 90 degrees from the state stored in the memory device 1. arise. In such a case, it is impossible to continuously generate raster scan data rotated by 90 degrees at the timing required by the parallel/serial data converter 3.
The entire raster scan data stored in the memory device 1 is once sent to the display control device 2, for example, and stored in the memory device 1 again for rearrangement so as to be rotated by 90 degrees, and then the target raster scan data is scanned by the method described above. It was outputting scan data.

Problems to be Solved by the Invention In such conventional methods, the entire raster scan data must be rearranged, which requires a large amount of processing time before actually outputting the raster scan data rotated 90 degrees. It was.

The present invention solves these conventional problems,
Do not perform preprocessing such as sorting on the raster scan data stored in the memory device (normal and
It is an object of the present invention to provide an excellent storage device that can perform high-speed writing/reading of raster scan data rotated by 0 degrees.

Means for Solving the Problems In order to achieve the above object, the present invention provides an arithmetic unit on an address bus and a data bus so that the address bus and the data bus are continuous in the direction of raster scan data both in the normal state and in the state rotated by 90 degrees. , pixel data is distributed and arranged on dot addresses of the memory device so that writing/reading of 1-bit pixel data is performed simultaneously on different data buses.

As an arithmetic device, there is an address bus arithmetic device that performs arithmetic operations according to the operating mode according to the address from the display control device and outputs an address signal, and an address bus arithmetic device that outputs an address signal according to the operating mode according to the address from the display control device. A data bus calculation device is provided that performs calculations according to the data signal and outputs data signals, and multiple pixel data read out simultaneously from the memory device for raster scanning are stored in different devices of the multiple memory devices in the memory device. It is a storage device that will be used.

Effect When the storage device of the present invention having the above configuration performs raster scanning, since the pixel data to be read out continuously is stored in different devices of the plurality of memory devices in the memory device, the raster scan display is changed by 90 degrees. Can be easily displayed. That is, during one scanning period of a raster scan, a certain number of data is simultaneously read out from the memory device according to the address signal of the address bus calculation unit, and this is repeated several times to complete the reading of one scanning signal. This simultaneous (multiple pixel data to be read out is stored in different memory devices, so by sequentially specifying the memory devices and specifying the address within that memory device, the desired pixel data can be read out at high speed. This relationship is stored in the memory device so that it holds true even when raster scan display is performed by rotating the image by 90 degrees, so that the address bus arithmetic unit generates an address signal according to the intended operation mode. It is possible to easily change the raster scan direction by 90 degrees.In other words, by performing operations on the address bus and data bus, an effect equivalent to rearranging the raster scan data is obtained, and the raster scan data itself is physically Since the physical arrangement does not change, pixel data can be written/read while the eyelids are in use in both normal and 90 degree rotated states.

Embodiment FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. FIG. 2 shows a conceptual diagram of the method of calculating the address bus and data bus in the same embodiment.

As shown in FIG. 1, as a component, 1 is a memory device, which stores raster scan data. A display control device 2 generates an address for outputting raster scan data. Reference numeral 3 denotes a parallel/serial data conversion device, which converts parallel data output from the memory device 1 into serial data. 4 is an address bus arithmetic unit, and 5 is a data bus arithmetic unit. A pressure signal line 6 is connected to the parallel-serial data converter 3. 7 is an address bus, and an address bus arithmetic unit 4. It is connected to the data bus calculation device 5 and the display control device 2. An address bus 8 is connected to the address bus arithmetic unit 4 and the memory device 1.

A data bus 9 is connected to the memory device 1 and the data bus arithmetic unit 5. 10 is a data bus;
The data bus calculation device 51 is connected to the display control device 2 and the parallel/serial data conversion device 3.

Next, the mutually related operations of the constituent elements of the above embodiment will be explained. In the above embodiment, when the display control device 2 outputs a read or write address to the address bus 7, the address bus arithmetic device 4 outputs a normal or 90 address.
It performs calculations according to the operating mode such as degree rotation, and outputs the results to the address bus 8. The output of address bus 8 is sent to each memory device 1 independently. Each memory device 1 outputs raster scan data to the data bus 9 for that address, and the data bus calculation device 5 performs calculations on this output according to the operation mode and the output of the address bus 7, and the result is is output to the data bus 10. Using this as an input, the parallel/serial data conversion device 3 converts the parallel data into serial data signals always in the same order, and generates an output signal line 64.

Next, the calculation method in the address bus calculation device 4 and the data bus calculation device 5 will be explained with reference to FIG. Generally, the number of data buses is often 8 to 32, but in this embodiment, the number of data buses is set to 4 for simplicity. Second
Figure (a) shows the physical arrangement of raster scan data and respective pixel data in the memory device 1, and shows how addresses and data are calculated when writing/reading pixel data. The parts surrounded by rectangles represent individual devices of the memory device 1, and AP represents pixel data. FIG. 2(b) shows how pixel data is written/read in the normal mode. Second
Figure (C2) shows how pixel data is written and read in the 90 degree rotation mode. The arrow (a) in FIG. 2 1'b) and FIG. 2(C) indicates the scanning direction of raster scan, and the arrow (b) indicates the concept of the method of reading pixels from each device. In this way, continuous pixel data in both the normal and 90-degree rotation mode raster scan directions are written on the address and data bus and calculated so that they are always placed in different devices. Since the data is distributed, it has the advantage that consecutive pixel data can be placed on the data bus simultaneously in either mode. Furthermore, in the above embodiment, the memory device], the address bus arithmetic unit 4, and the data bus 5 can be treated as normal memory devices from an external device.
Very versatile.

Effects of the Invention As is clear from the above description, the present invention performs arithmetic operations on address and data buses, and transfers continuous pixel data to different devices in both raster scan directions in normal and 90 degree rotation modes. This arrangement has the effect that pixel data can be instantaneously written/read both in the normal state and in the state rotated by 90 degrees.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a storage device according to an embodiment of the present invention, FIG. 2 is a conceptual diagram showing an operation method for an address bus and a data bus in the same embodiment, and FIG. FIG. 2 is a block diagram showing the configuration. 1...Memory device, 2...Display control device, 4...Address bus calculation device, 5...
...Data bus arithmetic unit. Name of agent: Patent attorney Haruaki Ogata et al.

Claims (2)

[Claims] (1) A memory device having a plurality of memory devices compatible with a data bus, a display control device that displays the stored contents of the memory device in a raster scan manner, and an operation according to an operation mode according to an address from the display control device. an address bus arithmetic device that performs an operation and outputs an address signal to the memory device; and an address bus arithmetic device that performs an arithmetic operation on the data output from the memory device according to the address signal of the address bus arithmetic device in accordance with the operation mode, and outputs the data signal. a data bus arithmetic unit that outputs data, and the storage data arrangement of the memory device is such that a plurality of pixel data read simultaneously in one raster scan by the display control device are stored in different devices of the plurality of memory devices. and the data signal is displayed in a raster scan manner by the display control device. (2) The storage device according to claim 1, wherein the display control device has two operation modes in which raster scan directions differ by 90 degrees.