JPS61230190A - Memory for multiwindow display - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a memory device for multi-window display that stores display contents of a display device.

2. Description of the Related Art A conventional multi-window display device is shown in, for example, Information Processing Vol. 25, 198442, P9B, Tutorial B. FIG. 4 shows a method for realizing multi-window display in a conventional display device.

1 is a window memory, 2 is a 7 frame cross 77. 3 and 4 are display contents to be displayed in each window.

As shown in FIG. 4, display contents 3 or 4 to be displayed in each window created in the window memory 1 are transferred to the frame buffer 2 in the format in which they are actually displayed. The window memory 1 is treated as a main storage device, and display contents 3 and 4 displayed in each window are written from the CPU through the system bus.

Problems to be Solved by the Invention However, in the above configuration, the addresses at which the data displayed in each window in the window memory are stored are different and constantly change depending on the display contents. Therefore, a program must be created while always being aware of changes in this address, resulting in problems in that the program for window operation becomes complicated and its execution speed becomes slow.

In view of this, an object of the present invention is to provide a memory device in which display data displayed in each window in a window memory can be viewed by a program as if it always exists at the same address.

Means for Solving the Problems The present invention is a memory device for multi-window display, which is provided with address conversion means for performing address conversion on address input information based on a window number.

Operation According to the present invention, with the above-described configuration, even if the same address of the memory device is accessed from the outside, different memory contents are accessed depending on the set window number.

Embodiment FIG. 1 is a block diagram of a memory device according to an embodiment of the present invention. In FIG. 1, 1o is a storage means for storing data, and 11 is an address conversion means. In this embodiment, the address conversion means 11 is composed of the following. 1
2 is a storage means 10 in which window display data is stored;
This is an address register that stores the first address within the register, and there are multiple registers. Reference numeral 13 denotes selection means for selecting one address register from among the plurality of address registers 12 in accordance with the window number. Reference numeral 14 denotes an addition means for adding the contents of the address register 12 selected by the selection means 13 and the address input given to the memory device to obtain an address of the storage means 10. Assume that the combinations of address registers 12 selected by window numbers are as shown in FIG.

The operation of the address conversion means 11 is expressed as shown in FIG. In other words, even if the same address value is input, if the window number is different and the contents of each address register 12 are different, different addresses will actually be input to the storage means 10.

If such a memory device is used for window memory,
As long as the window numbers are set to different values, the program can treat the data to be displayed in each window as if they exist at the same address in memory.

In this embodiment, the contents of the address converting means 11 consist of an address register 129, a selecting means 13°, and an adding means 14, but the information combining the address and the window number is the actual address of the memory element ε stage 1. Other methods are also possible as long as the address conversion means can perform one-to-one conversion.

As described in detail, according to the present invention, by associating a window number with each window, a program can treat data to be displayed in each window as existing at the same address.

Therefore, when displaying the same data in multiple windows, it is sufficient to use the same program and use different values only for the window numbers. Furthermore, even when display data is created using a plurality of programs, the address of the window memory can be handled in a unified manner, which prevents errors from occurring, which has a great practical effect.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is an explanatory diagram of the operation of the selection means, Fig. 3 is an explanatory diagram of the operation of the address conversion means, and Fig. 4 is a diagram illustrating the conventional method for realizing multi-window display. FIG. 1o...Storage means, 11...Address conversion means, 12...Address register, 13.
... Selection means, 14... Addition means. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] A frame buffer for storing data for display, a storage means for transferring data for display to the frame buffer, and an address conversion means for performing address conversion on address input information based on a window number, and the converted address A memory device for multi-window display, characterized in that addressing of the storage means is specified by.