JPS63245713A - Data processing system - Google Patents

Abstract

PURPOSE:To shorten a reading/writing processing time between storage devices having different code systems each other by generating a seeking command from a CPU to an external storage device, and immediately after generating a starting end signal from the external storage device, allowing the CPU to execute code conversion processing. CONSTITUTION:When receiving a starting end signal 6b from the external storage device 5 after generating a seeking command to the device 5, the CPU checks the code system of data in the device 5 and that of a memory in itself. When both the code systems are different, code conversion processing is execut ed. When a seeking operation end signal 6 is generated from the device 5, the CPU checks whether the code conversion processing is ended or not, and when the processing is ended, is turned to a waiting state. When a result status reception requesting signal 6d is generated from the device 5, the CPU receives data from the device 5.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a data input/output method between a memory existing in a central processing unit and an external storage device, and particularly relates to a data input/output method between a memory existing in a central processing unit and an external storage device. The present invention relates to a data processing method that improves a code conversion method performed when a code system existing in memory is different from a code system of data existing on an external storage device.

[Conventional technology]

In the conventional data processing method, a seek command issued from the central processing unit to the external storage device is executed, and three hardware signals are generated: a startup end signal, a seek operation end signal, and a result status pickup request signal. ,
After the central processing unit completes the process by receiving all result statuses, the coding system in the memory in the central processing unit and the coding system in the data in the external storage device are different. In this case, the code conversion process is performed, but after the code conversion process is performed, the shearing process is performed.

[Problem that the invention seeks to solve]

In the conventional data processing method described above, while seek processing is performed on the external storage device, the central processing unit enters a waiting state, reducing the overall processing capacity, resulting in very poor performance. The disadvantage is that the value becomes low.

[Means for solving problems]

The data processing method of the present invention issues a seek command signal from the central processing unit to an external storage device, and sends three hardware signals from the external storage device: a startup end signal, a seek operation end signal, and a result Cetus withdrawal request signal. It is characterized by simultaneously performing seek processing for receiving and processing wear signals, and code conversion processing that occurs when reading and writing the seek from the central processing unit to the external storage device or from the external storage device to the central processing unit. shall be.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a schematic diagram of an embodiment of the present invention. This embodiment comprises a central processing unit having a command issuing function 2, a code conversion function 3, a hardware interrupt detection function 4, and an external storage device 5. When the central processing unit 1 issues a seek command 6a to the external storage device 5, the external storage device 5 outputs a startup end signal 6b, a seek operation end signal 6c, and a result Cetus pickup request signal 6d.
Three hardware interrupt signals are generated.

Figure 2 is a flowchart of the program existing in the central processing unit.After the central processing unit issues a seek command to the external storage device, the central processing unit continues until the activation end signal is generated from the external storage device. , and this state is called a waiting state B12. When the activation end signal 13, which is the first hardware interrupt signal, is generated from the external storage device, the central processing unit reads the code system of the data in the external storage device and the code system on the memory in the central processing unit. If there is a difference, a coat conversion process 14 for performing coat conversion is executed.

After that, the second hardware interrupt signal, the seek end signal 15, is generated. At this time, the seek code system in the external storage device and the code system on the memory in the central processing unit are checked, and the If the code conversion process is completed, check 16 to see if the code conversion process is complete.
If it is not finished, finish it.Court conversion process 17
I do.

When the code conversion process is completed, the process enters the wait state 18 until the third hardware interrupt signal, ie, the result Cetus pick-up request signal, is generated. After that, the external storage device generates a third hardware interrupt signal, a Result Cetus takeover request signal, and receives the result status, which is the operation processing result of the seek command issued from the central processing unit to the external storage device. The central processing unit performs processing 20 to retrieve data from the external storage device. The end of the status transfer process to Rizal 1 means the end of the seek process.

〔Effect of the invention〕

As explained above, the present invention issues a seek command signal from a central processing unit to an external storage device, and receives a startup end signal and a seek operation end signal from the external storage device.
After the request signal for receiving the results is generated and the process is completed by the central processing unit receiving the results 1 to status from the external storage device, the processing is completed.
The conventional process of code conversion, which is performed when the code system on the memory in the central processing unit and the seek code system on the external storage device, is different, has been changed from the central processing unit to the external storage device. By performing the code conversion process immediately after issuing a seek command and generating a startup completion signal from the external storage device, the time required for reading and writing data from the external storage device can be shortened. Moreover, there is an effect that the central processing unit can be used effectively, the processing capacity can be improved, and the performance can also be improved from a performance standpoint.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of one embodiment of the present invention, and FIG.
The figure is a flowchart showing the operation of FIG. 1...Central processing unit, 2...Command issuing function, 3
・・Code conversion function, 4.・Hardware interrupt detection =
6- Output function, 5... External storage device, 11... Seek command issue, 12... Waiting state, 13... Hardware interrupt signal for completion of startup, 14... Code conversion process, 15. ...Hardware interrupt signal for completion of 1st seek operation, 16..Check whether code conversion processing is completed, 17..Code conversion processing, 18..Waiting state, 19..Results status. Hardware interrupt signal for pick-up request, 20...Results Cetus pick-up request processing.

Claims (1)

[Claims] A seek process in which the central processing unit issues a seek command signal to the external storage device, receives three hardware signals from the external storage device: a startup end signal, a seek operation end signal, and a result status pick-up request signal. A data processing method characterized in that a code conversion process that occurs when reading data from a central processing unit to an external storage device or writing data from an external storage device to the central processing unit is performed simultaneously.