JPS62112203A - Writing circuit for magnetic storage device - Google Patents

Abstract

PURPOSE:To decrease the number of the writing electric current driving circuit and to execute the decrease in cost by using one writing electric current driving circuit commonly for two reading and writing heads connected to the output terminal and executing the reading and writing. CONSTITUTION:By the signal inputted from the head selecting input signal terminal 6, a pre-writing circuit 3 of the reading and writing head system corresponding to a reading and writing head 1 to write at a head selecting circuit 4 is selected. Next, by the selected pre-writing circuit 3, the writing input signal inputted from a writing input signal terminal 5 is amplified. At both edges of a reading and writing head 1 driven by the differential output signal, the output terminal is inputted to a writing electric current driving circuit 2 connected respectively, thereby being able to drive the special reading and writing head 1 by the output of the writing electric current driving circuit 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a worn-out circuit for a magnetic storage device capable of storing/reproducing information signals.

[Conventional technology]

FIG. 3 is a configuration diagram showing an example of a conventional write circuit for a magnetic storage device. In this figure, 1 is a read/N write head, 2 is a write current drive circuit for driving the read/write head 1, and 3 is a block diagram showing an example of a conventional write circuit for a magnetic storage device. 1 is a pre-write circuit for amplifying a write input signal; 4 is a head selection circuit for selecting one of the read/write heads 1 for writing; 5 is a write input signal 1M element; 6 is a head selection circuit This is an input signal terminal.

Next, the operation will be explained. First, the head selection circuit 4 uses a signal input from the head selection input signal terminal 6 to
The pre-write circuit 3 of the read/N write head system corresponding to the read/write head 1 that performs writing is selected. Next, the selected pre-write circuit 3 amplifies the B write input signal input from the δ write input signal terminal 5. Then, by inputting the differential output signal to the input current drive circuit 2, a specific read/interval head 1 can be driven.

[The point that the invention is trying to solve]

In the conventional write circuit for magnetic storage devices as described above,
Each read/write head 1 requires a pair of write current drive circuits 'eJ2, which poses a problem of increased cost.

The present invention has been made to solve these problems, and an object of the present invention is to reduce the number of write current drive circuits and obtain a write circuit for a magnetic storage device that can reduce cost I.

[Between: Means to solve the problem]

The write circuit for a magnetic storage device according to the present invention includes: a head selection circuit for receiving a read/B write system in response to a read selection input signal and selecting a read system; and a head selection circuit for receiving an output from the head selection circuit. Sometimes a required number of pre-write circuits that amplify and output an input write input signal;
The required number of read/write heads connected in series and their output terminals are respectively connected between each read/write head, and the input terminals have read/write heads at both ends connected to the output terminals. It is equipped with a required number of write current drive circuits to which outputs from pre-write circuits corresponding to \read are connected.

[Effect]

In this invention, one write current drive circuit is commonly used by two read/write heads connected to its output terminal to perform reading/writing.

〔Example〕

FIG. 1 is a block diagram of a write circuit for a magnetic storage device showing one embodiment of the present invention, and the same reference numerals as in FIG. 3 indicate the same parts.

Next, the operation will be explained. First, a signal input from the head selection input signal terminal 6 selects the read/write/rad system pre-write circuit 3 corresponding to the read/write spatula 1!1 that performs writing in the head selection circuit 4. Next, this selected prewriting circuit 3
The write input signal input from the write input signal terminal 5 is amplified. Then, the write current drive circuit whose output terminals are respectively connected to both ends of the read/write head to be driven by the differential output signal.
The output of the write current drive circuit 2 can be used to drive a particular read/write head 1 according to the output of the write current drive circuit 2.

In the above embodiment, the read/write head 1 is described as having two terminals, but it operates similarly even if a read/write head 8 having a midpoint 0iai child circuit 7 is used as shown in FIG. can be done.

〔Effect of the invention〕

As explained above, the invention of O is: - A head selection circuit for selecting a read/write head system in response to a read selection input signal, and a write input signal that is input when an output from this head selection circuit is received. A required number of pre-write circuits for amplifying and outputting the same, a required number of serially connected read/write circuits, and their output terminals are connected between each read/write head, respectively. Both output terminals are connected to their input terminals (O%')
Since the required number of write current drive circuits are connected to the output from the pre-write circuit corresponding to the read/write/\read, one write current drive circuit has two write current drive circuits connected to its output terminal. Read (7/Write/
It is commonly used for \read, and has the effect of reducing the number of write current drive circuits and reducing costs.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a write circuit for a magnetic memory device showing one embodiment of the present invention, FIG. 2 is a block diagram showing another embodiment of the present invention, and FIG. 3 is a conventional write circuit for a magnetic memory device. In FIG. 3, which is a configuration diagram showing the circuit, 1 is a read/write head, 2 is a write current drive circuit, 3 is a @buying circuit, 4 is a head selection circuit, 5 is a write input signal switch, 6 is HE/RID selection input signal terminal, 7
is the midpoint terminal circuit. Note that the same reference numerals in each figure indicate the same or corresponding parts. Figure 1 Book 5 1 included input chi (to No. 6, Rad selection input signal terminal Figure 2

Claims (1)

[Claims] A head selection circuit for selecting a read/write head system upon receiving a head selection input signal, and a required number of prefixes for amplifying and outputting an input write input signal when receiving an output from this head selection circuit. a write circuit, a required number of read/write heads connected in series, an output terminal of which is connected between each of the read/write heads, and an input terminal of each of the read/write heads at both ends to which the output terminal is connected; A write circuit for a magnetic storage device, comprising: a required number of write current drive circuits to which outputs from the pre-write circuit corresponding to the write head are connected.