JPS63846B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to information transfer between a magnetic disk device and a magnetic tape device of an information processing device.

In a conventional information processing device of this kind, as shown in FIG. Processing device 5
It is connected to the. Now, when the magnetic disk device 1 is assisted by the magnetic tape device 2, the data stored in the magnetic disk device 1 is transferred to the magnetic tape device 2 through the path shown by the arrow in FIG. Ru. On the other hand, when data stored in the magnetic tape device 2 is transferred to the magnetic disk device 1, the data is returned to the magnetic disk device 1 through the reverse route.

Recently, the transfer speeds of magnetic disk devices and magnetic tape devices have become very similar, and the frequency of data transmission and reception between magnetic disk devices and magnetic tape devices has become extremely high. However, in such an information processing device configuration, while data is being sent and received between the magnetic disk device 1 and the magnetic tape device 2, part of the central processing unit is occupied, resulting in time loss. However, the software was becoming more and more complicated.

The present invention is an improvement on this, and an object of the present invention is to provide an information processing device that transfers data from a magnetic disk device to a magnetic tape device without going through a central processing unit.

The present invention provides a first recording device for transmitting data recorded on a first recording medium, a means for generating a clock signal synchronized with the data from the data, and a means for transmitting the data to a second recording medium. The present invention is characterized by comprising a second recording device for recording, and a control means for changing the recording speed of the second recording device in synchronization with the clock signal.

Next, embodiments of the present invention will be described based on the drawings.

FIG. 2 is a circuit configuration diagram of an apparatus according to an embodiment of the present invention. In the figure, data read from a magnetic disk device 1 enters a serial/parallel converter circuit 7 via a buffer circuit 6. This serial/parallel conversion circuit 7 converts the input data into a byte format. Here, between the magnetic disk device 1 and the magnetic tape device 2,
If there is a difference in recording method, the code conversion circuit 8
The converted data is converted into a code compatible with the magnetic tape device 2. Furthermore, the data output from the serial/parallel conversion circuit 7 is transmitted to the magnetic tape device 2.
It is configured to enter the recording/reproducing circuit 9 in the internal recording/reproducing circuit.

On the other hand, data read from the magnetic disk device 1 is branched and sent to the variable frequency oscillator 10. This variable frequency oscillator 10 generates a clock signal CL that is synchronized with input data, and sends this clock signal CL to a tape speed detection circuit 11 in the magnetic tape device 2. Further, this clock signal CL is branched and connected to the sampling input of the buffer circuit 6.

In the information processing device configured in this way, the data is sampled by the buffer circuit 6 by the clock signal CL synchronized with the data read from the magnetic disk device 1, and is input to the serial/parallel converter circuit 7 as regular information, and the data is Convert to byte format.

On the other hand, the tape speed detection circuit 11 detects the frequency of the clock signal CL, which is the output of the variable frequency oscillator 10, and determines the data transfer speed. As a result, the tape speed of the magnetic tape device 2 is automatically changed so that a constant recording density is achieved, and the recording/reproducing circuit 9 records the data converted into byte type onto the tape.

FIG. 3 is a configuration diagram of a tape speed control circuit in the magnetic tape device 2 according to the embodiment of the present invention. In the figure,
The output of the capstan drive circuit 13 is connected to a capstan motor 14. This capstan motor 14 generates a tacho pulse signal by its rotation.
Generates TP. This tacho pulse signal TP is transmitted to the tape speed detection circuit 11 via the waveform shaping circuit 15.
It is connected to the. This tape speed detection circuit 11
The output is fed back to the capstan drive circuit 13. Further, other inputs of the tape speed detection circuit 11 are connected to a clock signal CL and a write command WR read from a magnetic disk device (not shown).

This tacho pulse signal TP controls the rotation of the capstan motor 14 to start, stop, and run the tape at a reference speed.

FIG. 4 is an internal configuration diagram of the tape speed detection circuit according to the embodiment of the present invention. In the figure, TP is a tacho pulse signal, WR is a write command, and CL is a clock signal, which correspond to the signals in FIGS. 2 and 3, respectively.

The clock signal CL is a countdown circuit 16.
The signal is input to the AND circuit 18 via. The other input of this AND circuit 18 is connected to a write command WR sent out from the magnetic disk device. The output of the AND circuit 18 is connected to a tape speed detector 19. Also, the clock signal
CL is branched and connected directly to tape speed detector 19.

Further, the tacho pulse signal TP is input to the AND circuit 20 via the shaping circuit 15. The other input of this AND circuit 20 is connected to the write command WR via an inversion circuit 21. The output of the AND circuit 20 is transmitted to the tape speed detector 19
It is connected to the. The output of this tape speed detector 19 is connected to a capstan drive circuit (not shown).

With this configuration, the clock signal CL is set in advance to
It enters the tape speed detection circuit 19 and detects the approximate tape speed. Then, before the write command WR comes, the tacho pulse signal TP is detected by the tape speed detection circuit 1.
9 to control the startup of the capstan. Also, when the write command WR comes, the tacho pulse signal TP is not used, and the clock signal CL', which is a countdown of the clock signal CL, is sent to the tape speed detection circuit 19.
to control the rotation of the capstan. As a result, the tape runs in synchronization with the clock signal CL. When data writing is completed, write command WR
When the tacho pulse signal TP disappears, the tacho pulse signal TP is again input to the tape speed detector 19, and the capstan is brought under the same control as before.

In the embodiment of the present invention, the case where the write command is given from the magnetic disk device has been described, but the write command may also be given from the magnetic tape control device.
Furthermore, in a magnetic tape device that does not involve starting and stopping, it may rely only on the clock signal from the magnetic disk device instead of using the tacho pulse of the capstan.

As mentioned above, when recording data on tape, the clock signal from the magnetic disk drive is used to control the tape speed, and when starting and stopping, the tacho pulse signal of the capstan's closed loop circuit is used. By doing so, it is possible to automatically transfer data at a fixed recording density from the magnetic disk device to the magnetic tape device without going through the central processing unit, reducing the time that the central processing unit is occupied. An excellent device is provided for transferring data directly from the device to the magnetic tape device.

[Brief explanation of the drawing]

FIG. 1 is a basic configuration diagram of a conventional device. FIG. 2 is a circuit diagram of a device according to an embodiment of the present invention. FIG. 3 is a diagram showing the tape speed control configuration of the apparatus according to the embodiment of the present invention. FIG. 4 is an internal configuration diagram of the tape speed detection circuit of the apparatus according to the embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Magnetic disk device, 2...Magnetic tape device, 3...Magnetic disk control device, 4...Magnetic tape control device, 5...Central processing unit, 6...Buffer circuit, 7...Serial-to-parallel conversion circuit , 8... code converter, 9... recording/reproducing circuit, 10... variable frequency oscillator, 11... tape speed detection circuit, 13...
... Capstan drive circuit, 14 ... Capstan motor, 15 ... Shaping circuit, 16 ... Countdown circuit, 18 ... AND circuit, 19 ... Tape speed detector, 20 ... AND circuit, 21 ... Inverting circuit .

Claims (1)

[Scope of Claims] 1. A first recording device for transmitting data recorded on a first recording medium, means for generating a clock signal synchronized with the data from the data, and means for transmitting the data to a second recording medium. An information processing apparatus comprising: a second recording device for recording on a recording medium; and a control means for changing a recording medium driving speed of the second recording device in synchronization with the clock signal.