JPS59168558A - Converting system of address mode - Google Patents

Abstract

PURPOSE:To reduce the load of a host device and to process data at a high speed by providing a converting part on an interface between the host device and a magnetic disk device to perform conversion between a binary address and a cylinder head sector address. CONSTITUTION:An address mode converting part 1 is provided at an interface part of a magnetic disk controller IOC10. When the converting system works in a binary mode, a binary mode signal is applied to a detecting circuit 5. Under such conditions, a cylinder head sector address is delivered to a host device 11 from the IOC10. Then the part 1 delivers ''1'' after the circuit 5 detects the conditions of an end status, i.e., a state where the TX, BUSY, INT and A0 inversion are off, on, on and off respectively. Then the sector address is converted into a binary address by a converting circuit 2 and delivered to the device 11. While the circuit 2 of the part 1 converts the binary address sent from the device 11 into a cylinder head sector address and delivers it.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an address mode conversion method, and in particular converts addresses represented by cylinders, heads, and sectors as in magnetic disk drives into continuous binary addresses such as memory addresses. The present invention relates to converting a binary system address into a binary system address, or conversely, converting a binary system address into an address expressed in cylinders, heads, and sectors.

[Technology background, conventional technology and problems]

For example, as shown in FIG. 1, when accessing a magnetic disk device equipped with a plurality of magnetic disks D and heads Ho to H I, it is necessary to specify a cylinder, a head, and a sector. A specific area of the magnetic disk device can only be accessed after one piece of data is prepared. Here, the cylinder Q indicates the number of the circumference on the magnetic disk D, the head H indicates which surface of the magnetic disk is accessed, and the sector S indicates a divided area on the circumference.

By the way, when handling data in a processing device (hereinafter referred to as a host device), it is easier to represent memory addresses as continuous binary addresses, so 5. It is more efficient for the host device to perform operations using binary addresses.

However, when accessing a magnetic disk device.

Rather than binary addressing, the cylinder head sector addressing system is needed as described above.

Therefore, in the past, a program for converting between the binary addressing method and the cylinder head sector addressing method was prepared in the host device. ;7.
When performing f-address calculations, etc., the binary address method is used, and when accessing the magnetic disk device or when ATOBIS is sent from the magnetic disk device line, this conversion program is required. I had to convert the address to get it, so
This has the drawback of increasing the burden on the host due to these address translations and slowing down data processing.

In addition, in data processing systems that do not employ such address conversion methods, the binary addressing method cannot be used, so address calculations must be performed using the cylinder head sector addressing method, which slows down the calculation speed. exists.

[Purpose of the invention]

The purpose of the present invention is to improve the above-mentioned problems by providing binary addresses and cylinder head sectors on the interface between the host device and the magnetic disk device.
The purpose is to install a conversion unit that converts addresses.

[Structure of the invention]

In order to achieve this object, the address mode conversion method of the present invention allows a computer system equipped with a processing unit and a magnetic disk device to access the magnetic disk device using addresses indicated by cylinders, heads, and sectors, and to An address mode converter is provided on the interface between the magnetic disk device and the address mode converter.

Cylinder head - sector addressing system and binary φ
3. [Practice of the invention] characterized in that an address conversion means for mutually converting address systems, a switching means, and a detection means are provided, and the switching means is controlled by the detection means to perform address conversion control. Example] An embodiment of the present invention will be described based on FIGS. 2 to 5.

FIG. 2 shows an example of the address mode converter in the present invention.
FIG. 6 is an explanatory diagram of address conversion, FIG. 4 is an explanatory diagram of the arrangement of the address mode conversion section of the present invention, and FIG. 5 is a command execution time chart. In the figure, 1 is an address mode converter, 2 is a conversion circuit, 3 is a buffer, 4 is a switching circuit, and 5 is a detection circuit.

10 is a magnetic disk control device, and 11 is a post device.

12 to 14 are magnetic disk devices.

The address mode converter 1 is a characteristic part of the present invention, and as shown in FIG. Switching circuit 4. It is composed of a detection circuit 5 and the like. When the binary address is transmitted, the conversion circuit 2 converts it into a cylinder head sector address for the magnetic disk and outputs it, and vice versa.
When an address is input, it is converted into a binary address and output. The switching circuit 4 inputs the binary address input from the host device to the conversion circuit 2 via the buffer 3, and outputs the address and the converted address to the magnetic disk device.

Conversely, the cylinder head sector address input from the magnetic disk device is sent to the conversion circuit 2 via the buffer 6.
The address is input to the host device, converted into a binary address, and output to the host device.

The data input from each magnetic disk device.

As shown in FIG. 3, in addition to information on cylinder C, head H, and sector S, there are the number of transferred bytes and a flag.

This flag includes a machine number code, etc. for identifying a magnetic disk device when there are a plurality of magnetic disk devices. And among these, cylinder C ahead H.

A binary address is created based on each piece of information in sector S. Of course, the flag portion may also be changed as necessary.

This is when the five detection circuits are controlled in binary mode (binary mode signal on).

Not during data transfer (TX off), during command execution (BUSY on), and not during final completion report (JNT
off) and not in the command status mode (Ao off), it sends a switching control signal, and switches the switching circuit 4 to the binary address or cylinder head output from the host device or magnetic disk device. - It transmits the sector address to the conversion circuit 2 so as to convert it as described above, and controls the output after the desired conversion has been performed. The binary mode signal mentioned above is specified by, for example, a changeover switch.

The address mode converter 1 shown in FIG. 2 is installed, for example, in an interface portion of the magnetic disk control device 10, as shown in FIG.

Therefore, when the system shown in Fig. 4 operates in binary mode, the second
Application to detection time M5 in the figure 1. Turn on the binary mode signal. In this state, when the cylinder head sector address is output from the magnetic disk controller r4X1'0 to the host device 11, the detection circuit 5 in the address mode converter 1 detects the conditions for completion status transfer, that is, TX OFF, BU8Y ON, INT ON, 〇When the off state is detected, it outputs "1", and the conversion circuit 2 converts this address into a binary address and outputs it to the host device 11). Conversely, when a binary address is transmitted from the host device 11 (parameter transfer), the conversion circuit 2 of the address mode conversion unit 1 converts it into a cylinder head sector address as described above and transfers it to the magnetic disk. However, if the system shown in FIG. 4 does not use binary addresses, the binary mode signal applied to the detection circuit 5 of FIG. 2 is switched off. Controlled by a switch, etc.

In this state, the cylinder head sector 9 address is output from the magnetic disk controller 10 and the switching circuit 4
Since the detection circuit 5 outputs "0" even when the data is transmitted to the host device 11, the switching circuit 4 performs a through operation. It will be transmitted to

Therefore, using the magnetic disk control device 10 in which this address mode converter 1 is installed in the Innotaface part, it is possible to select either control using the cylinder head sector 9 address or control using a truncated binary address. can do.

By the way, in the system shown in FIG. 4, the command execution time chart is shown in the states shown in FIGS. That is, the command set comes first, then the parameters (
There is a transfer (cylinder, head, sector, etc.), then a read/write data transfer, and an end status transfer indicating whether or not this data transfer has been completed normally. Then, along with the command set, as shown in FIG.

A BUSY signal indicating that a command is being executed is output, and an attention ATN is output before data transfer.

During data transfer, TX indicating that data is being transferred is output. When reporting the completion status, a final completion report signal INT is output. Also, from the time of parameter transfer, the command, status, and mode are output. Of course, in the case of a write, a write pulse is output as shown in FIG. 5 (N), and in the case of a read, a read pulse is output as shown in FIG. When a data transfer request is made, DREQ is output as shown in FIG. 5(E).

As shown in the command execution time chart (shown in Figure 5), parameters and end status transfer are predetermined, so this time chart and byte
By using a counter, a conversion timing circuit can be easily obtained.

Of course, when transferring parameters or end status, they are first set in the buffer 3 shown in FIG. 2 and then converted into binary addresses.

〔Effect of the invention〕

In the present invention, the conversion between binary address and cylinder head sector address can be performed on the interface rather than within the host device.

Not only can it greatly reduce the burden on the host device and speed up data processing.

The binary addressing method can also be provided to devices that are older models and do not have a conversion circuit.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a magnetic disk, FIG. 2 is an example of an address mode conversion section in the present invention, FIG. 3 is an explanatory diagram of address conversion, and FIG. 4 is an explanatory diagram of the arrangement of the address mode conversion section of the present invention. Figure 5 is a command execution time chart. In the figure, 1 is an address mode converter, 2 is a conversion circuit, 3 is a buffer, 4 is a switching circuit, and 5 is a detection circuit. 10 is a magnetic disk control device, and 11 is a host device. 12-14 is a magnetic disk device. Patent applicant Fujitsu Ltd. Representative Patent Attorney Akira Yamatani

Claims (1)

[Claims] A computer system comprising a processing unit and a magnetic disk device, the magnetic disk device being a cylinder. In addition to accessing by the address indicated by head and sector, an address mode converter is provided on the interface between the processing unit and the magnetic disk drive, and this address mode converter has a cylinder head sector address method and a binary fist address method. Address conversion means for mutual conversion and switching means. 1. An address mode conversion system characterized in that a detection means is provided, and the detection means controls a switching means to perform address conversion control.