JPS61110229A - Magnetic disk controll circuit - Google Patents

Abstract

PURPOSE:To shorten the time required for completing data transfer, by performing magnetic disk seeking operations in parallel with the data transfer from a buffer for data of a main storage device. CONSTITUTION:A processor 6 previously connects internal buses 12a and 12b with each other by opening a bidirectional port 12. At the time of first actuation, the processor 6 issues a seeking instruction to a magnetic disk 8 through a disk interface circuit 7. After the data transfer between the magnetic disk 8 and a buffer 5 is started,the processor 6 causes the data transfer to be started by setting the information related to the data transfer between a main storage device 9 and the buffer 5. AT the time of second actuation, the processor checks the track number of the disk 8, to which access is to be made, and issues a seeking instruction to the disk 8 by closing the port 12. After the seeking operation is completed, the processor 6 again opens the port 12 after confirming the completion of the first data transfer, and transfers data from the disk 8 to the main storage device 9 through the buffer 5 as before.

Description

[Detailed Description of the Invention] Field of Industrial Application] This invention relates to a magnetic disk control device, particularly an improved magnetic disk control bag fljK having a built-in data buffer.
It is related to

[Conventional technology]

Conventionally, there has been a magnetic disk control device of this type as shown in FIG. In the figure, the iFi memory bus, 2
is a magnetic disk control device, 3 is a magnetic disk control device 2
4 is the memory bus 1.
and host interface circuitry that performs data transfer.

5 is a data buffer for storing data; 6 is a processor; 7 is a disk interface circuit that performs data transfer with a magnetic disk (described later); 8 is a magnetic disk; 9 is a main storage device; 10 is a central processing unit; 1) is a memory for storing startup information given from the central processing unit 1) 0, and has a structure that allows the magnetic disk control device 2 to receive and receive startup information that defines the next operation while it is operating. It is something.

Next, the operation will be explained. When receiving a command from the central processing unit 10 to read data read from the magnetic disk 8 into the main storage device 9, the i-disk control device 2 issues a seek command to search the magnetic disk 8 for a track from which data should be read. and when the seek is finished, the track number (
The internal control circuit 3 performs the confirmation g of the address). Next, under the control of the internal control circuit 3, data is written from the magnetic disk 8 to the data buffer 5 via the disk interface circuit 7. continue.

The data written to the data buffer 5.

Main memory 9 via host interface circuit 4 and memory bus 1t under the control of internal control circuit 3
One activation received from the central processing unit 10 is completed.

Here, if the activation information for the ninth time in the activation information storage memory 1) is set incorrectly, the data transfer is completed by performing the same process as described above.

[Problem that the invention seeks to solve]

FIG. 4 shows the relationship between the above-mentioned series of processing contents and processing time within the time TR until data transfer is completed when the same magnetic disk 8 accepts two successive activations from the central processing unit 10. This is Notooshi.

Since the conventional magnetic disk control device is configured as described above, compared to writing data read from the magnetic disk 8 directly to the main storage device t9, it takes less time to write data from the magnetic disk to the data buffer. An additional time corresponding to the required time, ie, TDI+TDt shown in FIG. 2, is lost, resulting in a disadvantage that the overall throughput is reduced.

[Means for solving problems]

This invention was made with the aim of improving the above-mentioned drawbacks of the conventional device, and includes the operation of transferring data between the main storage device and the data buffer, and the operation of transferring data to the magnetic disk by giving a seek command to the magnetic disk. The present invention provides a magnetic disk control device 1 that can perform the operation of moving a magnetic disk to a desired track in parallel.

[Effect]

In this invention, a magnetic disk seek operation is performed in parallel with the data transfer from the data buffer to the main storage device, and the time required to complete the data transfer is shortened.

[Embodiments of the invention]

Embodiments of the present invention will be described in detail below. FIG. 1 is a block diagram showing the configuration of a magnetic disk control device according to the present invention. The same parts as those in the conventional device shown in FIG.
- Omitted. The gist of this invention is to provide two-way disk controllers with a bidirectional port 12, which enables the processor 6 to control the magnetic disk 8 during data transfer between the main storage device 9 and the data buffer 5. There is a certain point.

The following is an example in which the next activation information is set in the activation information storage memory from the central processing unit 10 via the program control bus while the magnetic disk control device 2A of the present invention is in operation.

The processor 6 opens the bidirectional boat 12 in advance and connects the internal buses 12a and 12b.

The data read from the magnetic disk 8 is transferred to the main memory wave #9.
When the processor 6 receives a command to write to the magnetic disk 8 from the central processing unit 10 via the program control bus, the processor 6 issues a seek command to the magnetic disk 8 via the disk interface circuit 7.
The address is confirmed by the internal control circuit 3, data transfer between the magnetic disk 8 and the data buffer 50 is started, and after confirming that the transfer has been completed, the processor 6 transfers the data via the host interface circuit 4t. Information related to the data transfer to be performed between the main storage device 9 and the data buffer 5 is set in the internal control circuit 3, and all data transfer is started.

Next, the processor 6 reads information related to the second activation from the activation information storage memory and checks the track number of the magnetic disk 8 to be accessed in the second activation.

After that, the two-way boat 12 is closed and the internal buses na and 12 are closed.
After disconnecting b, the disk interface circuit 7
A seek command is issued to the magnetic disk 8 via.

Once the seek is complete.

After confirming that the first data transfer between the main memory device 9 and the data buffer 50 has been completed, the processor 6 opens the bidirectional port L2 again and transfers the internal paths 12a and 1.
2b.

Next, data is transferred from the magnetic disk 8 to the main storage device 9 via the data buffer 5 according to the procedure described above.

FIG. 2 shows the relationship between the contents of the series of processes described above and the time required to complete the data transfer.

Note that the data buffer 5 may be a RAM that stores all data and then outputs it, or may have a FIFO structure.

〔Effect of the invention〕

As described above, according to the present invention, seek operations on the magnetic disk can be performed in parallel with data transfer between the main storage device and the data buffer, so the time required to complete data transfer is reduced compared to conventional devices. It has the effect of shortening TRThTMt.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a magnetic disk control device of the present invention, FIG. 2 is a timing diagram showing the relationship between processing contents and processing time according to the present invention, and FIG. 3 is a block diagram showing the configuration of a conventional device. FIG. 4 is a timing diagram showing the relationship between processing contents and processing time of a conventional device. In the figure, 1...Memory bus, 2A...Magnetic disk control device, 3...Internal control circuit, 4...Host interface circuit, 5...Data buffer,
6... Processor, 7... Disk interface circuit, 8... Magnetic disk, 9... Main storage device, 10... Central processing lid, 1)... Start-up information storage memory, 12 ...bidirectional port Note that in each figure, the same reference numerals indicate the same or corresponding parts.

Claims (2)

[Claims] (1) In a magnetic disk control device that transfers data between a main storage device and a magnetic disk via a built-in data buffer, an operation of transferring data read from the data buffer to the main storage device; A magnetic disk control device characterized in that a seek operation for positioning a magnetic head of the magnetic disk to a desired track is performed in parallel. (2) The magnetic disk control device according to claim 1, further comprising a bidirectional boat for performing parallel operations.