JPS60242551A - Semiconductor integrated circuit device for floppy disk drive - Google Patents

Abstract

PURPOSE:To obtain small-sized, lightweight floppy disk drive equipment with reduced variance by incorporating a recording circuit and a reading circuit for floppy disks and a control circuit which controls a system necessary for the floppy disk equipment in one semiconductor integrated circuit. CONSTITUTION:The reading circuit part which reads contents recorded on a disk consists of a pulse generator, FF, one-shot multivibrator, comparator, differentiating circuit, read amplifier, and matrix circuit. A writing and erasing circuit part which erases existent information on disk surfaces and records a signal corresponding to an input consists of a write amplifier, FF, write current setting circuit, common driver, 5V detecting circuit, erasing circuit, one-shot multivibrator, gate, and matrix circuit. The control circuit part which controls the system necessary for the equipment consists of a one-shot multivibrator, FF, and gate. Those circuit parts are packaged in one IC, so the equipment is reduced in size and weight and the variance of the equipment is also reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a floppy disk drive (FDD) in which a write/read circuit for a floppy disk drive (FDD) and a control circuit for other systems of the FDD are incorporated into one semiconductor integrated circuit.
This is a semi-conductor integrated circuit device for DD.

[Prior art]

Conventional circuits of this type have the functions necessary for FDD.
It was composed of semiconductor integrated circuits such as L and TTL and discrete elements.

However, in such a conventional circuit, LSTTL, T
In order to commercialize products using a large number of TL and discrete elements, the number of external parts increases, leading to increased costs.
There were disadvantages such as: ■ increased man-hours, ■ inability to reduce size and weight, ■ inability to save labor, and large variations in equipment.

[Summary of the invention]

The present invention has been made to eliminate the drawbacks of the above-mentioned prior art, and incorporates a recording circuit and a reading circuit, which are the main functions of an FDD device, and a logic control circuit for controlling other systems necessary for the above device. To provide a semiconductor integrated circuit device for an FDD, which can be formed by being incorporated into a semiconductor integrated circuit to reduce size and weight, reduce man-hours, reduce costs, and reduce device variations. The purpose is to

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

The drawing shows one embodiment of the present invention, and in the drawing, 100 is a reading circuit unit (READ CIRCUIT) for reading the contents recorded on the disc;
This reading circuit section 100 includes a pulse generator 10
1,104, D flip-flop 102, one-shot multi-by-break 103, comparator 105, differentiation circuit 1
06, lead amplifier 107, and matrix circuit 10
8. This reading circuit 100 also has a one-shot external component connection terminal (
ONBSIIOT COMPONENTS)2. 3
．． 4. 5. External component connection terminal for differential circuit (DIFF
ERENTIATOR COMPONENTS ) 6.7
, differential circuit input terminal (ACTIVE DIFFEREN
TIA-TORINPUT > 8. 9. Read amplifier output terminal (AMPLIFIERO[ITPUT) 1
0. 11. Read amplifier gain adjustment terminal (OFFSE
T DECOUPLING )12. l 3. Head 1 terminal (HEADI) 14. It has 15.

Note that terminal 1 is a non-connection terminal (NC).

Further, 200 is a write/erase circuit section (recording circuit) for erasing information on the front of the disk surface before recording data on the disk, and for recording a signal according to input on the disk. The erasing circuit section 200 is
Write amplifier 201, flip-flop Fl-1, write current setting circuit 202, common driver 203.5
V detection circuit 204, erase circuit 205, one-shot multi-high break O/S-1, C)/S-2, gate G3
0. G31. G33 and a matrix 7x circuit 108. And this write/erase circuit 2
00 is the head 0 terminal (HEADO) as an external terminal.
) 16. 17. Common driver terminal (center tap output power supply terminal) (CTO.

CTI) 1B, 20.12V power supply voltage terminal (VBB) 1
9. Ground terminal (GND) 21-25, Erase circuit output terminal (ERASE) 26. Write current setting terminal (
CURRENT ADJ) 27, and external component connection terminal for one shot <ONE 5IIOT-1, -2>
28.

It has 29.

Reference numeral 300 denotes a control circuit unit for controlling the system necessary for FDD equipment, and this control circuit unit 300 includes one-shot multi-by-break O/S-3 to O/S-5, flip-flops FF-2, - 3, and each gate. Furthermore, in this control circuit section 300,
31, 32, and 34 are external component connection terminals (ONE 5HOT-3, -4, -5) for time constant setting of one-shot multi-by-break O/S-3, -4, -5, respectively.
33 is a 5V-Vcc terminal, 35 is a terminal for sending power when the power is turned on (5ET), and 36 is a voltage control output terminal (VOL
TAGECONTROL), 37-40 are stepper drive output terminals (STEPPERDRTVER)
, 41 is a trunk 0 sensor terminal (TRACK) for checking whether the head is in the trunk O position.
03ENSOR), 42 is an FPT sensor terminal (FPT 5ENSOR) for detecting whether or not recording is possible on the disk.
R), 43 is an index sensor terminal (INDEX 5EIJSO) for checking the rotational state of the disk.
R), 44 is the INUSE output terminal (INUSE LE
D), 45 is a non-connection terminal, 46 is an inte-nox terminal (n-EX) that outputs an output status signal indicating whether the disk is rotating normally, and 47 is a terminal indicating whether the flow-novy disk can be operated. Drive select terminal (DRIVE 5ELECT) for setting the state of
4 B is inside the throat.

Direction terminal (D
IRECTION), 49 is a step terminal (STEP) for moving the head, and 50 is a write data terminal (WRDATA) for writing data.
), 51 to 55 are ground terminals (GND), and 56 is a write gate terminal for selecting read or write (
WRGATE ), 5.7 is the track 0 terminal (TRACKO) for outputting a signal when track O is reached.
, 58 is a write protect terminal (WRPROTECT) for outputting a recording operation permission signal, 59 is a read data terminal (RD oir 8) for outputting a read output of the recorded contents of the disc, and 60 is a terminal 0 and 1 of the disc.
Side 1 terminal (SIDE 1) for selecting
It is.

The control circuit section 300 controls the drive select direction, step, write data, write gate, side 1. A control input circuit section having respective terminals of an index sensor, an FPT sensor, and a trunk 0 sensor, and an index.

Write protection, trunk 0. and an output circuit section having respective terminals for read data.

Note that in the figure, the * mark indicates that the output terminal is an open collector.

According to this embodiment, the logic circuit that controls the system required for the FDD device, including the reading and writing circuits, is incorporated into one semiconductor integrated circuit.
External parts and product board area are reduced, reducing man-hours and costs.

At the same time, it is small, lightweight, and labor-saving, and can significantly reduce the cost of the product. Furthermore, variations in device products can be suppressed and reliability can be improved.

In addition, the control input system and reading circuit are arranged in the same terminal row on the package, and a center-tap output power terminal is provided between the power supply voltage terminals, so external wiring is organized and stray capacitance on the board wiring etc. can be reduced.

〔Effect of the invention〕

As described above, according to the present invention, a recording circuit and a reading circuit, which are the main functions of an FDD device, and a control circuit for controlling a system necessary for the device are incorporated into one semiconductor integrated circuit. Therefore, it is possible to reduce the size and weight, reduce the number of man-hours, reduce costs, and reduce variations in equipment.

[Brief explanation of the drawing]

The drawing is a configuration diagram of a semiconductor integrated circuit device for FDD according to an embodiment of the present invention. 100...reading circuit section, 200...writing/
Erasing circuit section (recording circuit), 300... control circuit section. Agent Masuo Oiwa Procedural Amendment (Voluntary) 1. Indication of the case: Japanese Patent Application No. 59-99832 2, title of the invention 70 Tubi- Semiconductor integrated circuit assembly for disk drive 3,
To Hitoshi Katayama, representative of the person making the amendment, in Section 5, Detailed Description of the Invention in the Specification Subject to Amendment, column 6, the content of the amendment is to be corrected to ``For selecting a scdrive unit.'' (2) On page 7, line 9, ``like this'' should be corrected to ``like this''. that's all

Claims (1)

[Claims] (1) A recording circuit that records signals according to input on a floppy disk, a reading circuit that reads the contents recorded on the floppy disk, and a control circuit that controls the system necessary for the floppy disk drive device. A semiconductor integrated circuit device for a floppy disk drive, characterized in that it is formed by being incorporated into one semiconductor integrated circuit.