JPH06333339A - Magnetic recording device - Google Patents

Abstract

PURPOSE:To reduce current consumption by providing a power conserving signal generating circuit, a power conserving level controlling circuit, a control signal generating circuit and an operation signal generating circuit and by reducing the frequencies of operations of a recording and reproducing circuit and a read/write amplifier. CONSTITUTION:A power conserving signal generating circuit 11 outputs a power conserving signal Sa in accordance with the operation mode of a mode selection signal Si from an instruction device 19. A power conserving level controlling circuit 12 outputs a power conserving level signal Sb in accordance with an instruction signal Sj of the device 19. A control signal generating circuit 13 outputs a control signal Sc, which thins out the operating duration of a signal Sa recording and reproducing circuit and the read/write amplifier, by the signals Sa, Sb and a strobo signal Sk. An operation signal generating circuit 14 generates first and second operation signals Sd and Se from the signals Sc and Sa and outputs them to power save terminals 16a and 17a of a recording and reproducing circuit 16 and a read/write amplifier 17. Thus, the operation frequencies of the circuit 16 and the amplifier 17 are reduced and the current consumption is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording device for magnetically recording and reproducing information.

[0002]

2. Description of the Related Art In a conventional magnetic recording apparatus, when recording / reproducing of information is not performed, a recording / reproducing circuit is set to a power save mode by using a power save signal only in a data area, and a recording / reproducing circuit is set in all servo pattern areas. Set the operation mode and read the servo pattern, or
For example, as disclosed in Japanese Patent Laid-Open No. 4-186557, the servo pattern area detection means detects the servo pattern area, and a power control signal generated based on the detection timing is used to transfer only the data area to the recording / reproducing circuit. The method of stopping the power supply, supplying the power to the recording / reproducing circuit in all servo pattern areas, and reading the servo pattern has been adopted.

[0003]

However, according to the above-mentioned conventional method, the recording / reproducing circuit is operated in all the servo pattern areas written on the recording medium to read and position the servo patterns even if it is not originally required. For,
There is a problem that the current consumption amount becomes large.

In order to solve this problem, it is an object of the present invention to provide a magnetic recording apparatus that consumes less current and that reads servo patterns less frequently.

[0005]

To achieve the above object, the present invention comprises a power saving signal generating circuit, a power saving level control circuit, a control signal generating circuit, and an operation signal generating circuit. .

[0006]

The control signal generation circuit in the operation signal control circuit operates the power saving signal generated by the power saving signal generation circuit in accordance with the instruction of the power saving level control circuit to operate the recording / reproducing circuit in the power saving signal. A control signal for thinning out is generated. Furthermore, the operation signal generation circuit generates an operation signal by thinning out the operation period of the recording / reproducing circuit of the power saving signal using the control signal. As a result, the operation signal becomes a signal that reduces the frequency of operating the recording / reproducing circuit as compared with the power saving signal. Further, the instruction device controls the power saving level control circuit, so that an arbitrary power saving level can be set.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a magnetic recording device according to the present invention. The power saving signal generation circuit 11 outputs the power saving signal Sa according to the operation mode designated by the mode selection signal Si of the instruction device 19 in synchronization with the servo pulse Sf output from the servo pulse generation circuit 15. A power-saving level control circuit (hereinafter, referred to as a level circuit) 12 is designated by a command signal Sj of a commanding device 19 to specify a power-saving level in a certain operation mode, and a power-saving level signal (hereinafter, referred to as a level signal) corresponding thereto is designated. ) Output Sb. here,
Mode selection signal Si, instruction signal Sj, strobe signal S
The device that outputs k may be any device that can output a signal, such as a CPU, a digital circuit, an analog circuit, or a switch. The control signal generation circuit 13 uses the power saving signal Sa, the level signal Sb, and the strobe signal Sk to save the power saving signal Sa.
The control signal Sc for thinning out the recording / reproducing circuit and the read / write amplifier operation period (hereinafter referred to as the circuit operation period) T1 is output. The operation signal generation circuit 14 uses the control signal Sc
From the power saving signal Sa and the first operation signal Sd, the second operation signal S
power saving terminal 16 of the recording / reproducing circuit 16
a and the power save terminal 1 of the read / write amplifier 17
7a respectively.

FIG. 2 shows an example of the signal waveform generated at each stage of FIG. Servo pulse S used here
1 is the same as the servo pulse Sf output from the servo pulse generation circuit 15 in FIG.
a is the same as the power saving signal Sa output from the power saving signal generation circuit 11 in FIG. The section T1 in the power saving signal Sa is the recording / reproducing circuit 16 and the read / write amplifier 1.
Reference numeral 7 represents an operation period in which the servo pattern read operation is performed, and section T2 represents a non-operation period in which the read operation is not performed. Further, Sc0 to Sc3 are waveform examples of the control signal Sc, Sd0 to Sd3 are waveform examples of the first operation signal Sd corresponding to the control signals Sc0 to Sc3, and Se0 to Se3 are waveform examples of the second operation signal Se. is there. For example, when the control signal has a waveform like Sc0, the first operation signal is Sd.
0, the second operation signal has a waveform of Se0.

Next, a more detailed description will be given with reference to FIGS. 2, 4, 5, and 6. FIG. 4 is a detailed circuit example of the level circuit constituting the magnetic recording apparatus of the present invention. The instruction signal Sj and the power saving level signal Sb used here are the same as those shown in FIG. In FIG. 4, the instruction signal Sj from the instruction device 19 is decoded by the decoder 49, and the multiplexed circuit (hereinafter referred to as MUX).
Select signals Ss1 to Ss4 for controlling 41 to 48 are output. The MUXs 41 to 48 select signals Ss1 to Ss1.
Ss4 and setting terminal 41a of each MUX
According to .about.48c, the level signal Sb is output. For example,
When a ground level is input to the instruction signal input terminal 49a of the decoder 49 and a high level is input to the decoder 49b, the select signal S
Only s3 goes high. As a result, the setting terminal 41
c is selected, the output terminal 41e of the MUX 41 is at the ground level, and similarly, the output terminal 42e of the MUX 42 is the same.
Is high level, the output terminal 43e of the MUX 43 is high level, the output terminal 44e of the MUX 44 is high level, MUX
The output terminal 45e of the MUX 45 is at the ground level, the output terminal 46e of the MUX 46 is at the high level, and the output terminal 4 of the MUX 47 is
7e outputs a high level signal, and the output terminal 48e of the MUX 48 outputs a high level signal Sb (at this time, the output terminal 48e outputs MSB, 41e outputs LS).
See B as an 8-bit hexadecimal number and represent it as EEh). In the other three combinations of the instruction signals Sj input to the instruction signal input terminals 49a and 49b, the corresponding level signal Sb is similarly generated. For example, input terminal 4
When both 9a and 49b are at the ground level, the level signal Sb of 00h is generated and the input terminal 49a is at the high level,
When 49b is at ground level, 55h level signal Sb
Is generated. In this embodiment, select signals Ss1 to Ss
Although the decoder 49 is used to obtain 4, the instruction signal Sj may be set to 4 bits without using the decoder and used as the select signals Ss1 to Ss4. Furthermore, the number of level signals Sb that can be generated can be changed by increasing or decreasing the number of bits of the instruction signal Sj. Further, as the level circuit, a memory may be used as shown in FIG. This is because the pattern of the level signal Sb is written in the memory 71 in advance, the instruction signal Sj is input to the address input terminal 71a, and the data output terminal 71b.
This is a method in which the signal output by the above is used as the level signal Sb. As described above, the power saving level control circuit may be any one that can output a signal having a waveform of a certain pattern.

FIG. 5 is a detailed circuit example of the control signal generating circuit which constitutes the magnetic recording apparatus of the present invention. Power saving signal Sa, power saving level signal Sb, control signal Sc used here
The instruction signal Sj is the same as that shown in FIG. In FIG. 5, the value of the level signal Sb is D-type flip-flops (hereinafter, referred to as D-FF) 51 to 58 by setting the strobe signal Sk to the ground level.
Is set to. And the clock terminal 51a of the D-FF
To 58a, the power saving signal Sa is input to the D-FFs 51 to 58.
By shifting the value set in, the control signal Sc
Is generated. As the control signal Sc, a signal corresponding to the value of the level signal Sb is generated. For example, the level signal Sb is 0
When it is 0h, the control signal Sc0 in FIG. 2 is generated, and when the level signal Sb is 55h, the control signal Sc1 is generated.

FIG. 6 is a detailed circuit example of the operation signal generating circuit which constitutes the magnetic recording apparatus of the present invention. The power saving signal Sa, the control signal Sc, and the first operation signal S used here
The d and the second operation signal Se are the same as those shown in FIG. As shown in FIG. 6, by ANDing the control signal Sc and the power saving signal Sa, the first operation signal S
d, the second operation signal Se is obtained. As the first operation signal Sd and the second operation signal Se, signals corresponding to the value of the control signal Sc are generated. For example, in FIG. 2, when the control signal Sc0, the first operation signal Sd0 and the second operation signal Se0 are generated, and when the control signal Sc1, the first operation signal Sd1 and the second operation signal Se1 are generated. Here, the same signal is used for the first operation signal Sd and the second operation signal Se, but different timings are taken into consideration in consideration of the difference in the transition time to the operation mode of the recording / reproducing circuit 16 and the read / write amplifier 17. It may be a signal.

Next, regarding the second embodiment according to the present invention,
This will be described with reference to FIG. FIG. 3 is a block diagram of the second embodiment. The power saving signal generation circuit 11 shown here,
Power saving level control circuit 12, control signal generation circuit 13, operation signal generation circuit 14, servo pulse generation circuit 15, recording / reproducing circuit 16, read / write amplifier 17, read / write head 18, mode selection signal Si, strobe signal Sk,
The instruction signal Sj, the servo pulse Sf, the power saving signal Sa, the control signal Sc, the reproduction pulse data Sh, the recording data Sn, the reproduction data Sg, the recording signal Sm, and the reproduction signal Sl are the same as those in FIG. In FIG. 3, the first operation signal So and the second operation signal Sp generated from the operation signal generation circuit control the power supply circuits A31 and B32, and the recording / reproducing circuit 1
6 shows a method of turning on and off the power supplies Sq and Sr supplied to the power supply terminal 16b of No. 6 and the power supply terminal 17b of the read / write amplifier 17 to save power.

The configuration of the present invention has been described above using the two embodiments. In addition to this, the power supply control of the second embodiment and the power save terminal of the first embodiment are performed. Combination of control is also conceivable.

[0014]

In the magnetic recording apparatus according to the present invention, current consumption can be suppressed because the recording / reproducing circuit and the read / write amplifier operate less frequently in the idle mode and when a cache hit occurs during execution of a read command. Further, since the operation frequency can be set arbitrarily, it is possible to support many operation modes. Furthermore, when a CPU that performs servo is used as the pointing device, the number of times of servo calculation is reduced and the time spent therefor is shortened, so that the CPU can perform other processing more efficiently.

[Brief description of drawings]

FIG. 1 is a block diagram of a magnetic recording apparatus according to a first embodiment of the present invention.

FIG. 2 is a waveform diagram of a signal at each operation stage of the circuit of the magnetic recording device according to the present invention.

FIG. 3 is a block diagram of a magnetic recording device according to a second embodiment of the invention.

FIG. 4 is a circuit diagram showing a first embodiment of a power saving level control circuit which constitutes the magnetic recording apparatus of the present invention.

FIG. 5 is a circuit diagram of a control signal generation circuit that constitutes the magnetic recording device of the present invention.

FIG. 6 is a circuit diagram of an operation signal generation circuit that constitutes the magnetic recording device of the present invention.

FIG. 7 is a circuit diagram showing a second embodiment of a power saving level control circuit which constitutes the magnetic recording device of the present invention.

[Explanation of symbols]

 11 power saving signal generation circuit 12 power saving level control circuit 13 control signal generation circuit 14 operation signal generation circuit 15 servo pulse generation circuit 16 recording / reproducing circuit 17 read / write amplifier 18 read / write head 19 indicator device power saving signal Sb power saving level Signal Sc Control signal Sd First operation signal Se Second operation signal Sf Servo pulse Sg Playback data Sh Playback pulse data Si mode selection signal Sj Indication signal Sk Strobe signal Sl Playback signal Sm Recording signal Sn Recording data So First operating signal Sp No. Two motion signals

Claims (1)

[Claims] 1. A recording medium having a plurality of servo pattern areas, a read / write head for recording / reproducing data,
A read / write amplifier that amplifies a reproduction signal read from the read / write head and outputs reproduction data or supplies a recording signal to the read / write head, and generates reproduction pulse data from the reproduction data amplified by the read / write amplifier. Or a recording / reproducing circuit for supplying recording data to the read / write amplifier, a servo pulse generating circuit for detecting the servo pattern area based on the reproducing pulse data generated by the recording / reproducing circuit and generating a servo pulse, A power-saving signal generation circuit that generates a power-saving signal for operating the recording / reproducing circuit and the read / write amplifier in the entire servo pattern area based on the timing from the servo pulse generation circuit, and according to the operation mode. Whether to output a mode selection signal or instruction signal An instruction device that outputs a strobe signal for setting a power saving level signal that controls the degree of power saving, a power saving level control circuit that generates the power saving level signal according to an instruction signal from the instruction device, and the power saving level control circuit. A control signal generation circuit that generates a control signal in synchronization with the power saving signal from a power level signal, a first operation signal that thins out the power saving signal using the control signal, and sets the recording / reproducing circuit to an operating state, and A magnetic recording device, comprising: an operation signal generation circuit for generating a second operation signal for operating the read / write amplifier.