JPS60205643A - Address control system - Google Patents

Abstract

PURPOSE:To perform address control covering plural areas by integrating plural areas in a memory into one according to an addressing mode selection, and performing addressing operation independently. CONSTITUTION:A microprogram 1 sets an addressing mode setting bit corresponding to an addressing mode in an address mode setting register 2 with a register input 6. The output 7 of this register 2 is decoded by an addressing mode decoder 3 and one of addressing modes 1-5 is outputted. An address pointer control circuit 4 controls how respective areas in a data buffer 5 are addressed according to the outputted addressing mode.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to an address control system, and particularly relates to 1. an address control system that allows memory such as a data buffer to be used effectively.

[Background of the invention]

An example of a conventional address control method will be described below, taking access to a data buffer in a disk control device as an example.

The data buffer of a disk control device, for example, consists of area 1 and area 2, each consisting of several hundred bytes, and these two areas are completely independent. Also, an address control circuit called an address pointer is When the microprogram commands to use area I, sequential addressing is performed within area I, and when commanded to use area 2, sequential addressing is performed within area 2.

Here, sequential addressing refers to addressing by updating the address to be accessed by +1, such as accessing address O and then accessing address I. After accessing the final address of the area, return to the beginning and access address 0 again.

In a disk control device that controls a CKD (count section, key section, data section) type disk device, there is a write mode in which data sent from a channel device is written to the disk, and a write mode in which data read from the disk is written to the channel device. In the sending read mode, the count part and the key part are placed in area L of the data buffer, and the data part is placed in area 2 of the data buffer.
to temporarily buffer.

During a series of data transfers, the count section and the key section are required by the control device, so they must always be held in area 1. Therefore, area 1 needs to be large enough to accommodate the counting section and the key section. On the other hand, area 2 is used for the data part, but since this is a very large number with a maximum of several blade bytes, area 2 is used.
You can't hold it all inside. However, once the written data is read out, the control device does not need it, so new data can be written to that address.

As mentioned above, area 1 and area 2 in the data buffer in a conventional disk control device are completely independent and are used in completely different ways. Therefore, in this method of use, there is a problem in that when the use is transferred from one area to another, the address pointer must be newly set.

Furthermore, when a diagnostic program is executed, the data portion read from the disk is written into the area 2 of the data buffer in the disk controller, and the microprogram refers to this data to check its validity. The presence or absence of a disk failure is checked by checking, but in this case, there is a problem in that there is a limit to the number of bytes of data sent from the disk device and written in the area 2.

All of the above problems arise because the conventional address control method is fixed with respect to the memory or the like to be controlled.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and its purpose is to provide an address control method that enables address control over multiple areas in a memory, which was impossible with conventional address control methods. It is about providing.

[Summary of the invention]

The gist of the present invention is to operate the address pointer by selecting an addressing mode, and address each of multiple areas in the memory by integrating them into one area in some cases, and addressing each area independently in some cases. The point is that it can be addressed as an object.

[Embodiments of the invention]

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an addressing circuit for a data buffer of a disk controller according to an embodiment of the present invention.

In the figure, l is a microprogram, 2 is an addressing mode setting register, and 3 is an addressing mode setting register.
4 is an address pointer control circuit, and 5 is a data buffer. Also, 6 is register input, 7 is register output, 8 is address, 9 is write data, ■0
indicates read data.

In the circuit of this embodiment, the addressing mode is set based on FIG. 2. That is,
It is assumed that 3 bits of addressing setting bits 1 to 1 are prepared for setting the addressing mode, and the microprogram operates these 3 bits. In addition,
It is assumed that the address pointer operates according to the addressing mode setting.

The above FIG. 2 shows addressing modes 1 to 5 corresponding to FIGS. 3 to 7, and shows the movement of the address pointer and reference drawing numbers corresponding to each mode. 3 to 7 show areas in the data buffer of the disk controller, and in the figures, 11 is area l, 1
2 indicates area 2, and 13 indicates area 3. Also, the arrows within each data buffer indicate how the address pointer sequentially addresses the data buffers.

Among addressing modes 1 to 5 shown in FIG. 2, addressing mode 1 is the same as the addressing method of the data buffer in the conventional device. On the other hand, addressing modes 2 to 5 are newly proposed by the present invention.

For example, in FIG. 4, areas 1 to 3 are treated as one area and addressed, so when the diagnostic program is executed, which was mentioned earlier as one of the problems with the prior art, When the microprogram refers to the sent data after writing it to the data buffer, Areas 1 to 3 can be used as the data storage area, so the data buffer can be used more effectively than before. law has become possible.

In FIG. 5, there is no need to reset the address pointer when moving from the area handling the count section and key section to the area handling the data section, which is another problem with conventional devices. .

This is because once an address in area 1 is addressed, it is never addressed again and the address pointer moves to area 2.

Also, in FIGS. 6 and 7, area 3 is addressed independently. This kind of usage is.

For example, a microprogram may use area 3 in the data buffer not for buffering data transfer, but as a table in which information necessary for program control is written.

Returning to FIG. 1, the operation of this embodiment will be explained.

The microprogram 1 sets addressing mode setting bits corresponding to the addressing mode shown in FIG. 2 in the addressing mode setting register 2 by register manual 6.

The output of this register 2 is decoded by the addressing mode decoder 3, and is then decoded by the addressing mode decoder 3.
One of 5 is output.

Based on the output addressing mode, the address pointer control circuit 4 controls how each area in the data buffer 5 is addressed. The specific contents of this □ control are as previously shown in FIGS. 3 to 7.

In the above embodiments, the present invention has been explained by taking access to a data buffer of a disk control device as an example, but the present invention is not limited to this and can be widely applied to memory access control in general. Needless to say.

[Effects of the Invention] As described above, according to the present invention, the address pointer is operated by selecting the addressing mode, and each of a plurality of areas in the memory is integrated into one area in some cases. In addition, in some cases, each of the above areas can be addressed independently, making it possible to control addresses across multiple areas in memory, which was impossible with conventional address control methods. Rather, it has the remarkable effect of realizing an address control system that provides flexibility in how each area is used.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the addressing circuit of a data buffer of a disk control device which is an embodiment of the present invention, FIG. 2 is a diagram showing the contents of the addressing mode, and FIGS. 3 to 7 are diagrams showing areas within the data buffer. 7 is a diagram showing the dressing situation of FIG. ■2 microprogram, 2 near dressing mode setting register, 3 near dressing mode decoder, 4
Near address pointer control circuit, 5: Data buffer, 1
1-13: Area. 1st) Figure 2 Figure 6 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] (1) In an address control method for accessing a memory consisting of a plurality of areas, means for setting a plurality of addressing modes for addressing the plurality of areas, and deciphering the addressing mode set in the setting means. and means for controlling an address pointer, and by setting a predetermined addressing mode in the setting means, the access method of the memory consisting of the plurality of areas can be converted. .