JPS62273675A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To attain the low power consumption and low peak power of a computer system including the titled device by using an interface control circuit so as to supervise a power voltage thereby applying power supply control to a read/write circuit and a track selector or the like. CONSTITUTION:A signal (d) detecting the normal rotation of a spindle motor 6, a seek enable voltage detection signal (b) informing the possibility of seek and a write enable voltage detection signal (c) informing the write enable state are connected to an interface control circuit 7. Then a READY signal representing the enable state of a magnetic disk device is outputted based on the signals to make communication with a host device. Concretely, only when all the signals (b), (c), (e) are at high level, the READY signal is brought into a low level. The kind of operation disable is recognized at the host device depending on what level of a control signal reaches before the READY signal goes to a high level. Thus, a faulty state is sent to the host device and at circuit block the device is operated only at a proper voltage.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a magnetic recording device such as a floppy disk using a magnetic disk.

[Conventional technology]

In conventional magnetic disk drives, power is supplied to the rotation drive means, read/write circuit, and track selection means according to instructions from the host side, and the power supply is controlled depending on the state of the power supply voltage, and the power supply is controlled depending on the state of the power supply voltage. was never transmitted to the host. As a special example, there was an example in which a write-protected reinterface control circuit was reset depending on the power supply voltage.

c) Problems to be Solved by the Present Invention] However, in the above-mentioned conventional technology, the power consumption control is closed within the magnetic disk device, and the power consumption cannot be controlled in the entire computer system, and the host is not notified of an abnormality. Due to lack of means, reliability is poor, and the burden required for host circuit and program development is large, and conventional REA
Because the DY signal was roughly detected using the INDEX period, abnormalities could not be detected until the equivalent type'at pressure decreased, or it took time to detect, or short-term voltage abnormalities could not be detected. , I didn't know what was wrong until I executed the command.

In addition, in conventional voltage detection methods, when the voltage drops below the detection voltage, the entire magnetic disk drive is reset or only write operations are prohibited, but the power supply voltage required for each block in the magnetic disk drive is different. Therefore, if one voltage was used for detection, there would be too much margin for certain operations, and even if only writing was protected, if the voltage recovered after a malfunction, an erroneous write would occur. .

In particular, by protecting disks, controlling power, and notifying the host of the abnormal state according to the voltage value of the power supply abnormality and the duration of the abnormality, it is possible to quickly recover to the normal state and escape from the abnormal state. It is of great significance to realize a more reliable magnetic disk device.

[Means for solving problems]

As mentioned above, the present invention aims to reduce the peak value of power consumption of the entire computer system, and at the same time improve reliability by regulating operation at a power supply voltage that cannot normally operate. By suspending operations depending on the abnormal power supply voltage time width, the peak value is lowered as much as possible, and the write circuit is protected and the status is transmitted to the host. The first is during seek to select a track. At this time, the drive step motor is driven with high power, so before starting the seek, it is determined whether the power supply voltage is the voltage necessary for seek, and if it is normal, it seeks to the target track. . If the power supply voltage is lower than the required voltage, the state is transmitted to the host without performing a seek operation. After that, when the power supply voltage returns to a seekable state, the state is transmitted to the host and seek is performed to the target track. Furthermore, when the rotational drive means is activated, the operation is suspended and the status is transmitted to the host according to the power supply voltage as in the seek time, and the power supply voltage is constantly monitored during steady rotation of the rotational drive means, and the voltage is If the voltage is low enough to perform a write operation but does not interfere with stable rotation, it will notify the host that it is unable to write and prohibit write operations even inside the magnetic disk device. When the power supply voltage becomes a write-enabled state, the state is transmitted to the host, and when a write request is received from the host, the write operation is performed immediately.
The power supply voltage is constantly monitored during steady rotation of the rotary drive means, and if the voltage value exceeds a voltage that is difficult to perform a writing operation or maintain stable rotation for a certain period of time, it is determined that writing is not possible. is transmitted to the host, and write operations are also prohibited inside the magnetic disk device. After that, even if the power supply voltage becomes a writable state, the transmission of the state to the host is delayed until the rotation reaches a normal state again, and even if a write request is received from the host, the write operation is suspended until the rotation reaches a normal state.

[Effect]

By adopting the above-mentioned method of the present invention, the peak power consumption of a magnetic disk device and a system using the magnetic disk device is reduced and erroneous ffJ+ operations are prevented, and the reliability of the entire device such as a computer is improved and the size is reduced. , greatly contributes to cost reduction.

〔Example〕

FIG. 1 is a block diagram of a magnetic disk drive r in an embodiment of the present invention.

1 is a step motor control circuit that controls track selection, and 5TEP that commands movement of one track from the outside.
A signal and a DIR signal that commands the direction of movement are input. 1 is a seek enable voltage detection signal outputted from the voltage detection circuit of 8 to inform that a seek operation is possible; 5TE;
The step motor 2 is driven according to PSDfR, and during movement, the drive voltage is turned LOW (-ff
i) to HIGH (generally 12V) to generate a large torque. The seek possible voltage detection signal is a signal that becomes LOW level when the power supply voltage range that allows normal seek operation is exceeded.
When the level is W, seek operations are prohibited or suspended.

4 is a magnetic head that reads and writes information;
3 is a read/write circuit that controls the magnetic head. 3 is a 5IDE signal that specifies the surface of the magnetic head;
A write gate signal WG, a signal WD that is data that instructs magnetization reversal by a pulse during writing, a signal RD that outputs read data, and a write enable signal output from the voltage detection circuit 9 that indicates that a write operation is possible. A voltage detection signal C and a spindle motor normal rotation detection signal d which is at HIGH level when the spindle motor is rotating normally are connected.

The write operation enable voltage detection signal goes LOW when the voltage 'a1 that allows normal write operation goes out of the voltage range.
This is the signal that becomes the level. Write operation enabled F: When the 1Tt pressure detection signal or the spindle motor normal rotation detection signal is at the LOW level, the write operation is prohibited or suspended.

5 is a control circuit for controlling 0N10FF of the spindle motor 6. 5 is connected to a spindle motor rotation enable voltage detection signal e outputted from a voltage detection circuit of IO and informing that the spindle motor can be operated. The spindle motor rotatable voltage detection signal is a signal that becomes LOW level when the voltage exceeds its voltage range in which the spindle motor can rotate normally. When the spindle motor rotatable voltage detection signal becomes LOW level, the signal d for detecting the normal rotation state of the spindle motor is set to LOW level. At this time, it is also possible to stop the rotation of the spindle motor and wait for the power supply voltage to recover.

The spindle motor normal rotation state detection signal is when index pulses are detected continuously within a predetermined time range, or when the spindle motor rotatable voltage detection signal is H.
If the predetermined time has passed after reaching the IGH level, H
This is a signal at IGH level.

7 is an ink-face control circuit that communicates with the host. 7 is connected to a signal d for detecting the normal rotation state of the spindle motor, a seek enable voltage detection signal b1 for informing that a seek operation is possible, a write operation enable voltage detection signal C for informing that a write operation is possible, and these signals. Based on this, it outputs a READY signal indicating that the magnetic disk device is operational, and communicates with the host. Specifically, b, c, ea
The READY signal is set to LOW level only when the signal at t is at HIGH level. The host can know the type of inoperability based on what the previous control signal was when the READY signal became HIGH.

Furthermore, by compounding l and 3.7, i! Naturally, it is possible to form a single circuit, and in that case, input terminals for each voltage detection can be provided, or the voltage detection circuit can be incorporated into an integrated circuit.

FIG. 2 is a timing chart showing the operation of the configuration diagram in FIG. 1, in which signals S, c,
The READY signal is switched by d and e, the seek operation is controlled by signal S, the write operation is controlled by signals c and e, and the rotational operation of the spindle motor is controlled by signal d.

〔Effect of the invention〕

As described above, the configuration of the present invention not only allows abnormal conditions to be transmitted to the host, but also enables each circuit block to operate only when the voltage is appropriate, improving the reliability of computer systems including magnetic disk drives, and reducing power consumption,
This enables low peak power consumption.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a magnetic disk device according to an embodiment of the present invention.
FIG. 2 is a timing chart diagram of FIG. 1. l...Ste, motor control circuit 2...
・Step motor 3... Read/write circuit 4...
Magnetic head 5...Spindle motor control circuit 6...
... Spindle motor 7 ... Interface control circuit 8 ...
・Step motor operable voltage detection circuit 9...
・Voltage detection circuit that enables read/write operations 1O...Voltage detection circuit that enables spindle motor operation Applicant: Seiko Epson Corporation Figure 2

Claims (2)

[Claims] (1) Magnetic disk, rotation drive means for rotating the magnetic disk medium, magnetic head and read/write circuit for reading and writing, track selection means for selecting the track position of the magnetic head, communication with the host and the above In a magnetic disk drive comprising an interface control circuit that performs comprehensive control of each block, the interface control circuit monitors the power supply voltage to control the read/write circuit, the track selection means,
A magnetic disk device characterized in that power supply control of the circuit driving means is performed. (2) Magnetic disk, rotation drive means for rotating the magnetic disk medium, magnetic head and read/write circuit for reading and writing, track selection means for selecting the track position of the magnetic head, communication with the host and the above In a magnetic disk drive that is composed of an interface control circuit that performs comprehensive control of each block, the interface control circuit monitors the power supply voltage so that the interface control circuit informs the host of the power supply voltage and the status of the magnetic disk drive. A magnetic disk device characterized by having a means for transmitting information.