JP2508740B2 - Disk drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in the following order.

A Industrial Field B Outline of the Invention C Conventional Technology D Problems to be Solved by the Invention E Means for Solving Problems (FIGS. 1 and 3B) F Action G Example G ₁ Floppy operation of the disk drive unit (FIG. 1) G ₂ floppy disk drive (Fig. 3 a) G ₃ other operations of the floppy disk drive (Fig. 3 B) G ₄ operation relating to the buffer memory (FIG. 2 ) G ₅ data recording format (Fig. 4-Fig. 9) formed of a G ₆ parity (Figure 10) G ₇ map memory area (FIG. 11) H fIELD the present invention on the effect a industrial invention floppy The present invention relates to a disk drive device suitable for application to a disk drive device, a hard disk drive device, and the like.

B SUMMARY OF THE INVENTION The present invention is directed to a head, a head control unit that controls the head, a buffer memory that stores data read from a disk by the head, and an error that performs error correction processing on the data stored in the buffer memory. It has a disk drive device main body having a correction processing section and a microcomputer for controlling the disk drive device main body, and the head is operated in response to a request from the microcomputer to the disk drive device main body for data reproduction of a desired track of the disk. A disk drive device configured to move to a desired track of a disk, read the data of the desired track, store the read data in a buffer memory, perform error correction processing, and then transfer the microcomputer to a microcomputer. In the In response to a data reproduction request to the disk drive device body for data over a plurality of tracks on the disk, the head moves to a desired track on the disk and reads the data on the desired track to the buffer memory. After the reading operation is completed, the error correction processing of the data stored in the buffer memory is performed, and the moving processing for moving the head to another desired track of the disk is performed. It is possible to shorten the time required for the data to be transferred to the microcomputer after the data is requested to be reproduced.

C Conventional Technology Conventionally, microcomputer (host computer)
In response to the data reproduction request from, the data reproduced from the magnetic disk (the diameter is 2 inches, ie, 5.08 cm, and the floppy disk is composed of 4 sectors per track) is subjected to error detection and error correction processing. Has proposed a magnetic disk drive device for transferring to a microcomputer.

In such a magnetic disk drive device, even in response to a reproduction request for data from several tracks from a microcomputer, the reproduction data is subjected to error detection and error correction processing for each sector and then transferred to the microcomputer for each sector. Was doing. The magnetic head moves from one track to the next track only after the error detection and error correction processing of the data of each sector of the certain track is completed. The time required for this error detection, error correction, and data transfer varies depending on the degree of error and the operating speed of the microcomputer, but is generally 10 or more.
It is about mS to several tens of mS.

Therefore, the feed control mechanism of the magnetic head does not perform any operation during this period, and is merely waiting. On the other hand, the time required for the magnetic head to move from one track to an adjacent track is about 16 mS, and the time it takes for the magnetic head to settle after moving to the new track is about 12 mS.
28mS.

D Problem to be Solved by the Invention As described above, in the conventional magnetic disk drive device, when there is a request for reproducing data over several tracks of the magnetic disk based on the instruction of the microcomputer, reproduction from the magnetic disk is performed. During the period of error detection, error correction and data transfer for each sector of data, the magnetic head was waiting without moving between tracks, so there was a dead time during that time, which resulted in several tracks from the microcomputer. There is a drawback that the time required from the data reproduction request to the transfer of the data to the microcomputer becomes extremely long.

In view of the above point, the present invention proposes a disk drive device capable of shortening the time required to transfer the data to the microcomputer after the microcomputer requests the reproduction of the data over several tracks. To do.

E Means for Solving the Problems The present invention provides a head, a head control means for controlling the head, a buffer memory for storing the data read from the disk by the head, and an error for the data stored in the buffer memory. A disk drive device main body having an error correction processing unit for performing a correction process, and a microcomputer for controlling the disk drive device main body, and a request from the microcomputer to the disk drive device main body for data reproduction of a desired track of the disk. On the other hand, the head moves to the desired track of the disk, reads the data of the desired track, stores the read data in the buffer memory, performs error correction processing, and then transfers the data to the microcomputer. A disk drive device In response to a data reproduction request from a computer to the disk drive device for data over a plurality of tracks on the disk, the head moves to a desired track on the disk and reads the data on the desired track to the buffer memory. The
After the reading operation is completed, error correction processing of the data stored in the buffer memory is performed, and movement processing for moving the head to another desired track of the disk is performed.

According to the present invention, the head is moved to the desired track of the disk by the control means in response to the data reproduction request of the data from the microcomputer to the disk drive main body over the plurality of tracks of the disk. After the reading operation of one desired track is performed to the data buffer and the reading operation is completed, the error correction processing of the data stored in the buffer memory is performed and the moving processing of moving the head to another desired track of the disk. To perform.

G. Embodiment Hereinafter, an embodiment in which the present invention is applied to a floppy disk drive for driving a 2-inch floppy disk will be described in detail.

G ₁ floppy disk drive First, FIG. 1, illustrating the overall configuration of a floppy disk drive. The floppy disk drive (10) includes an interface circuit (1) to which a host computer (microcomputer) (1) is externally connected.
The microcontroller (12) and the buffer memory (13) are connected to the interface circuit (11).

The microprogram control unit (12) interprets a simple instruction supplied from the host computer (1) via the interface circuit (11), and converts microcode for performing a series of write / read control into the instruction execution unit ( 14)
Supply to.

Here, the buffer memory (13) is composed of, for example, a static RAM and has five memory areas (13A) to (13E) as shown in FIG. The storage capacity of each of the memory areas (13A) to (13E) is sufficient to write data reproduced from each sector of the floppy disk (one track is composed of four sectors) and to perform error correction processing on the data. 6K bytes or more, here 6K bytes. Therefore, the total capacity of the buffer memory (13) is
It is 30K bytes, but here 32K bytes of memory is used.

The buffer memory (13) has an error correction processing unit (15)
Is connected, and a recording / reproducing / erasing circuit (1) is connected via a data modulation circuit (16) and a data demodulation circuit (17).
8) is connected.

Then, the instruction executing section (14) includes a data modulating circuit (16), a data demodulating circuit (17), a recording / reproducing / erasing circuit (18), etc. in accordance with the microcode supplied from the microprogram control section (12). A mechanical deck that not only controls the operation, but also controls the head feed motor (22) that moves the magnetic head (20) over the radius of the floppy disk (21) and the spindle motor (23) that rotates the floppy disk (21). -Supply control data to the system controller (19).

Note that the element circuits (11) to (17) may be collectively referred to as an ADC (advanced disk controller).

The interface circuit (11) has five types of 1-byte reset register, 1-byte status register, 1-byte command register, 4-byte parameter register and 1-byte data register for interface with the host computer (1). It has a register.

The five _{registers, A 0, A 1, RD} , WR, CS, the DACK 6
According to the bit data, selection is made as shown in Table 1.

[Reset Register] The reset register is supplied with reset command data for performing the initial setting of the floppy disk device (10) and the calibration of the drive. When a reset command is given to the reset register, the spindle motor (23) stops immediately and the magnetic head (20) returns to the home position.

[Status register]

The status register indicates each state of the floppy disk drive (10) with 8 bits, and the most significant D ₇ bit of D ₇ (Non-DMA Data Request: non-DM
The (A data request) flag is used for the purpose of handshaking when data transfer is performed with an external system, that is, the host computer (1). The D ₇ flag becomes "1" every time the data transfer is possible, during the transfer of data becomes "0", again becomes Upon completion of the 1-byte data transfer "1", the number of transfer which is determined The inversion is repeated until.

D ₆ of the next D ₆ bits (No Media: no medium) flag,
Indicates the mounted state of the floppy disk (21). When the floppy disk (21) is not mounted, or when the floppy disk (21) is pulled out by operating the eject button during mounting, "1" is displayed. Become.

The next D ₅ bit D ₅ (Media Change) flag indicates that the floppy disk (21) may have been replaced. At reset or once the floppy disk (21) has been ejected. "1" when is not installed, or when the floppy disk (21) is pulled out by operating the eject button during installation.
Becomes The flag returns to "0" when the data is read correctly from the floppy disk (21) next.

Next D _4-bit D ₄ (Write Protect: write protection) flag indicates write inhibit state of the floppy disk (21), a floppy the case of mounting a floppy disk (21) that writing is prohibited It becomes "1" when the disk (21) is not mounted, and becomes "0" when the writable floppy disk (21) is mounted.
become.

Next D ₃ bits and D ₂ bits of D ₃ (ECC Error (error) (MSB)) flag and D ₂ (ECC Error (error)
The (LSB) flag is a 2-bit flag that indicates what kind of error occurred in the error detection / correction process that is automatically executed by the error correction processing unit (15) during read processing.
It is shown as one state.

Next D ₁ bits D ₁ (Drive Error: drive error) flag indicates a malfunction of the drive, "1" if the function of the drive is not performed correctly, then the read / write / erase The state of “1” is held until the normal execution or the above-mentioned reset command is received.

The D ₀ (Command Busy: during command) flag of the lowest D ₀ bit indicates the execution state of a command other than the reset command, and becomes “1” during execution and processing of a command other than the reset command. , Returns to “0” with the end of the processing.

[Command register]

The command register is provided with all command data for controlling the floppy disk device (10), and is designated by setting bits corresponding to respective basic functions to "1". The microprogram control unit (12) interprets the contents of 1-byte command data given to the command register by the host computer (1), and instructs the instruction execution unit (14) to erase, record, or reproduce data. Operations and the like are automatically executed in a predetermined sequence.

To D _7-bit and D ₆ bits of most significant of the command register, the drive specification command (Unit the Select (unit select) 1, Unit the Select (unit select) 2)
Is given. With this 2-bit drive designation command, up to four drives can be designated.

The following D ₅ bits, execution prohibition command (Execution an In
hibit). By this D ₅ bits to "0", disabling the functions specified in the lower D ₄ to D ₀ bits. When performing the process with execution, the D ₅ bits to "1".

Also, the D ₄ bits, commands the rotation of the spindle motor (23) (Mon: Motor On : Motor ON) command is applied. A spindle motor (23) is rotated by the D ₄ bits to "1". The spindle motor (23), by a D ₄ bits to "0", and stopped after a predetermined time. In addition, the magnetic head (2
0) moves from the home position to the outermost periphery side when the spindle motor (23) starts rotating, and returns from the current position to the home position when the spindle motor (23) stops. Incidentally, D ₄ bits need to be set every time the normal read / write / erase operation to "1" without the microprogram control unit (12) may be a D ₄ bits is "0", read The rotation of the spindle motor (23) is automatically started with the / write / erase processing, and is stopped after a lapse of a fixed time from the end of the processing.

In the next D ₃ bits, data transfer (Data Transfer)
Command is supplied. By this D ₃ bits to "1", transmitting and receiving data between the floppy disk drive (10) and the host computer (1). Data transmission and reception are performed via the data register in the buffer memory (13).
Is performed by sequential transfer. In this case, the number of transfer data is 4K bytes, 512 bytes, or 256 bytes.
Either byte can be selected, and the address within each 4K byte can be specified. The buffer memory (13) can be used as a temporary bank memory of the host computer (1) regardless of the operation of the floppy disk drive (10). And can be accessed in 512-byte and 256-byte logical sector units.

The following D ₂ bits, erase (ER: Erase) command is applied. By the D ₂ bits to "1", the erase physical sector units specified by the parameter register is performed.

The following D ₁ bit, write (WR: Write) command is ETae. By the D ₁ bit to "1", it is written in physical sector unit specified by parameter registers. When an index is specified in the parameter register, an index signal is recorded. Here, by the above write (WR) command,
The micro program control section (12) performs processing in accordance with a predetermined sequence for writing data to the floppy disk (21), and outputs parity data / subcode data / header information for error correction processing to the error correction processing section. It is automatically generated in (15) and sequentially output according to a predetermined format. Note that a series of data transfer / erase / write operations can be executed by a write (WR) command, and the microprogram controller (12) automatically performs processing according to a predetermined sequence.

A read (RD: Read) command is given to the next D ₀ bit. By this D ₀ bit to "1",
Reading is performed in physical sector units specified by the parameter register. If an index is specified in the parameter register, it becomes invalid and a drive error occurs in the status register. Here, in response to a read (RD) command, the program control unit (12) performs processing according to a predetermined sequence for reading data from the floppy disk (21), and reads a signal from the floppy disk (21). At the same time, the error correction processing unit (15) performs error data detection / correction processing on the data read into the buffer memory (13) according to a predetermined format. In addition, a floppy disk (2
The data transfer of the reproduced data from 1) to the buffer memory (13) and the data transfer from this buffer memory (13) to the host computer (1) can be executed by a read (RD) command, and microprogram control is possible. The unit (12) automatically performs the processing in accordance with a predetermined sequence. When the reading is completed normally, the reproduced track / sector number is written to the parameter register.

[Parameter register]

Further, the parameter register is used to determine whether read / write / erase is performed in physical sector units or tracks (= 4 sectors)
Track / sector number when the unit is used, a 1-bit flag indicating that the track number is written,
Sector and track mode discrimination data, memory area number of the buffer memory (13), parameter data for designating erasing in track units and writing of index signal are given. This parameter register consists of 5 bytes, and the register pointer advances every time 1 byte is read or written, and when the reading of the 5th byte or the writing of the 2nd byte is completed,
When the access is further continued, the pointer returns to the first byte. The pointer returns to the first byte when a register other than the parameter register is accessed, and the order of accepting the parameter registers is initialized.

The first byte of the parameter register is a physical sector address that is associated with read / write / erase processing, and a virtual logical sector address that transfers data between the buffer memory (13) and the host computer (1). It is used as a sector register for specifying physical sector size selection, index writing, and track erasing. In this sector register, three types of logical sector sizes are selectively designated by the most significant two bits (D ₇ , D ₆ ), and index writing designation and erasing of the entire track are designated [1, 1 ]. Set the most significant 2 bits (D ₇ , D ₆ ) of the above sector register to [1,1]
As a write / erase combination command is given to the command register as, the microprogram control section (12) performs the write processing of the index signal after once erasing the entire track. By writing the index signal on the floppy disk (21) in this manner, the floppy disk (21) can be accessed thereafter in physical sector units.

The next two bits (D ₅ , D ₄ ) specify the physical sector address of 4 Kbytes. The value becomes valid when the read processing is normally performed. (1) The collation with the physical sector address specified on the side can be performed. The four least significant bits (D ₃ , D ₂ , D ₁ , D ₀ ) specify a logical sector address in units of 512 bytes.

The second byte of the parameter register is used as a track register for specifying a track number. In this track register, the lower 7 bits are the track number (1-5
0), and the host computer (1) can collate the specified track address as necessary. Also, the MSB of this track register is allocated for the above flags.

The third byte of the parameter register has one bit (D ₇ ) as sector mode / track mode discrimination data (“0”, “1”) and the memory areas (13A) to (13E) of the buffer memory (13). No. "000", "001", ‥‥,
It is composed of three bits (D ₆ , D ₅ , D ₄ ) indicating “100” and _four lower-order spare bits (D ₃ , D ₂ , D ₁ , D ₀ ).

Furthermore, the 4th and 5th bytes of the parameter register contain a 2-byte copy protection code (CPC: Copy Prote
ction Code).

[Data register]

Further, the data register is used when data is transferred between the floppy disk controller (10) and the host computer (1), and the program (PRO) is used.
It supports both transfer and DMA transfer, and in any case, data is transferred via this register.

Operation of G ₂ Floppy Disk Drive Device Next, the operation of the floppy disk drive device (10) will be described with reference to the flowchart of FIG. 3A. First, the command data given to the command register from the host computer (1) causes the command register D
It is judged whether "1" is set to any of ₄ (Mon) bit, D ₂ (ER) bit, D ₁ (WR) bit or D ₀ (RD) bit (step 1), and the judgment is made. If the result is “Y” (= “YES”), the floppy disk (2
It is determined whether or not (1) is attached (step 2). If the determination result in step 2 is "Y", that is, if the floppy disk (21) is mounted, the control microcomputer (μCOM) of the mechanical deck system controller (19) determines the maximum processing operation in step 3 below. If the control microcomputer (μCOM) is released from the processing operation, it is determined whether or not it is in the middle, and the D ₂ (ER) bit, D ₁ (WR) bit or D _{0 of the} command register
It is determined whether "1" is set in any of the (RD) bits (step 4). Then, the judgment result of step 4 is “Y”, that is, the host computer (1) erases (ER), writes (WR) or reads,
If any of the (RD) operation commands is issued, it is judged whether or not there is a drive designation by the D ₇ and D ₆ bits of the command register (step 5), and if the self drive designation is not made, After giving the disk surface number (SURF #), drive number (DR #) and motor-on signal (Mon) to the mechanical deck system controller (MD) (19) (step 6), in the next step 7, the mechanical deck system controller (19) ) Control microcomputer (μCO
M) determines whether or not it is in the process operation, and after the control microcomputer (μCOM) is released from the process operation, the track number (TR #) set in the parameter register is set to the mechanical deck system. It is given to the controller (MD) (19) (step 8). If the determination result in step 5 is "Y", that is, if the drive is designated, the process immediately proceeds to step 8 and the track number (TR #) is set to the mechanical deck system controller (MD).
In step 9, it is judged whether or not "1" is set in the D ₀ (RD) bit of the command register. Then, the determination result of step 9 is “N” (=
"NO"), that is, if the read operation is not specified, the data given to the data register is transferred to the buffer memory (13) (step 10), and then at the next step 11, the command register It is judged whether or not "1" is set in the D ₁ (WR) bit. Step 11
Is "Y", that is, the host computer (1)
By if the specified write operation has been made, the determination of whether the writing specified index has been made to look at D _7, D ₆ bits of 1 byte i.e. sector register parameter register at the next step 12 I do. If the index writing is not designated, the process proceeds to step 13 and the error correction processing unit (15) for the data written in the buffer memory (13).
At step 14, parity encoding processing (ENC) is performed, and it is determined at step 14 whether or not "1" is set in the D ₂ (ER) bit of the command register. If the determination result in step 12 is “Y”, that is, the index writing is designated, the step immediately
Moving to 14, it is judged whether or not the erase operation is designated by the host computer 1. If the result of the determination in step 14 is "Y", that is, the erasing operation is designated, the erasing operation (ER) and the writing operation (WR) are performed (step 15). If no designation has been made, only the write operation (WR) is performed (step 16). Further, if the result of the determination in step 11 is "N", that is, the recording operation is not designated, only the erasing operation (ER) is performed (step 17). When the operation of step 15, step 16, or step 17 is performed, the end of the operation of step 15, step 16, or step 17 is confirmed by checking the D ₀ (Command Busy) flag of the status register in the next step 18, ,
Move to the next step 19, D ₄ (Mon) of the command register
It is determined whether or not "1" is set in (step 19). If the judgment result in step 19 is "N", it is judged in the next step 20 whether the control microcomputer (μCOM) of the mechanical deck system controller (19) is in the middle of processing operation. , When the control microcomputer (μCOM) is released from the processing operation, the disk surface number (SURF #) and drive number (DR #)
And a motor-off signal (Moff) to the mechanical deck system controller (MD) (19) (step 21), and then enters a standby state (step 22).

If the result of the determination in step 1 is "N", that is, if the host computer (1) has not commanded the operation of the floppy disk drive (10), the operation proceeds to step (23) and the mechanical deck system controller (19)
The control microcomputer (μCOM) determines whether or not the processing operation is in progress, and when the control microcomputer (μCOM) is released from the processing operation, the disk surface number (SURF #) and the drive number (DR #) and the motor-off signal (Moff) from the mechanical deck system controller (M
D) After being given to (19) (step 24), data transfer is performed (step 25), and the standby state of step 22 is entered.
The determination result of step 4 is "N", that is, only the rotation designation (Mon) of the spindle motor (23) is performed by the host computer (1), and the erasing operation (ER), the writing operation (WR), and the reading operation are performed. If (RD) is not specified, the process proceeds to step 26, where the disk surface number (SURF #), drive number (DR #), and motor off signal (Moff) are transmitted to the mechanical deck system controller (MD) (1).
9) (step 24), and the data transfer of step 25 is performed. Further, if the result of the determination in step 2 is "N", that is, if the floppy disk (21) is not mounted, the flow proceeds to step 27 to determine whether or not a drive has been designated. The process enters a standby state at 22, and when another driver is designated, the process proceeds to step 20.

Further, the determination result in step 9 is "Y", that is, the read operation (RD) by the host computer (1).
If the determination has been made, the process proceeds to step 28, where various flags are reset, and then the data is read from the floppy disk (21) to the buffer memory (13) (step 29). Then, when the data read operation of step 29 is performed, the end of the operation of step 27 is confirmed by checking the D ₀ (Command Busy) flag of the status register in the next step 30, and then the process proceeds to the next step 31 and the status look at D ₁ bit register, correctly sent by normal data read operation on a target track of the magnetic head (20) it is determined whether or not performed in step 29, if no drive error, error correction The processing section (15) performs an error correction process (DEC) (step 32). Then, in the next step 33, it is determined whether there is an error that cannot be corrected by the error correction processing in step 32, and if there is no error, the subcode data (SUB-C
The track number (TR #), sector number (SC #), and copy prohibition code (CPC) included in the ODE) are transferred to the parameter register (step 34), and an error in the subcode data (SUB-CODE) is transferred. Judgment (Step 3
Five). If there is no error in the subcode data (SUB-CODE), the read data is transferred to the buffer memory (13) via the data register to the host computer (1), and the process of step 36 is performed, and then step 19 is performed. Move on to.

If the determination result in step 31, step 33, or step 35 is "Y", that is, if an error has occurred, the process immediately proceeds to step 19.

Floppy disk drive apparatus of this embodiment (10), command data (D ₇ provided by the host computer (1) to the command register of the interface circuit _{(11), D 6, D} 5, D 4, D 3, D 2 , D ₁ , D ₀ ) are interpreted by the microprogram control unit (12), and various series of control operations as described below are performed.

[Control operation example 1] (1) Spindle motor on (2) Magnetic head feed (seek) (3) Erase operation (4) Write operation (5) Spindle motor off (6) Magnetic head feed (calibrate) [Control operation example 2] (1) Spindle motor on (2) Magnetic head feed (seek) (3) Data transfer (4) Erase operation (5) Write operation [Control operation example 3] (1) Spindle motor on (2) Magnetic head feed (seek) (3) Erase operation (4) Write operation [Control operation example 4] (1) Spindle motor on (2) Magnetic head feed (seek) (3) Read operation (4) Spindle motor off (5) Magnetic head feed (calibrate) [Control operation example 5] (1) Spindle motor on (2) Magnetic head feed (seek) (3) Read operation (4) Data transfer Here, command data (D ₇ , D ₆ , D ₅ , D ₄ , D ₃ , D ₂ , D) ₁ ,
An example of the control operation when the command data [0010110] is given to the command register of the interface circuit (11) by the host computer (1) as D ₀ ) will be described in detail.

The microprogram control unit (12) interprets the command data [0010110] and sends a rotation command signal (Mon) for the spin motor (23) and a track number (T) from the command execution unit (14).
R #) by serial transfer to the mechanical deck system controller (19). Then, in response to the rotation command signal (Mon) and the track number (TR #), the mechanical deck system controller (19) starts the spindle motor (23) to rotate the floppy disk (21), and the feed motor (22) While moving the magnetic head (20) to the position of the designated track number (TR #), the microprogram control unit (12) notifies the host computer (1) of the completion of preparation for data transfer, and the host computer (1) The data is transferred to the buffer memory (13) via the data register of the circuit (11). Further, the mechanical deck system controller (19) indicates that the spindle motor (23) has stabilized its rotation and that the magnetic head (20) has completed moving to prepare for recording.
Inform 4). Furthermore, the error correction processing unit (15)
An error correction parity is generated for the data transferred from the host computer (1) to the buffer memory (11). And the microprogram control unit (12)
When the mechanical deck system controller (19) notifies the instruction execution unit (14) of the completion of recording preparation, and when the error correction processing unit (15) completes the parity generation,
After the floppy disk (21) has rotated to the start position of the target sector, the recording circuit and the erasing circuit are operated so that the data can be recorded by the recording / reproducing head while erasing by the preceding erase head. Further, the micro program control section (12) sends a motor off signal (Moff) of the spindle motor (23) from the instruction execution section (14) to the mechanical deck system controller (19) by serial transfer, and the spindle motor (23) is supplied. The rotation is stopped and the host computer (1) is notified of the completion of the data recording operation.

Other Operations of G ₃ Floppy Disk Drive Next, other operations of the floppy disk drive will be described. Host computer (microcomputer)
(1) writes the track number TR (k) of the first data to be reproduced on the floppy disk (21) to the parameter register of the interface circuit (11), and
A flag indicating that the track number is written in this parameter register is also written in this parameter register at the same time. Therefore, if the host computer (1) reads the part in which the flag of the parameter register is written, it is found that the track number is written in the parameter register. When this flag is detected, the track is written in the parameter register. Writing a number is prohibited.

Next, the host computer (1) issues a command to the floppy disk drive (10) to reproduce the data from the floppy disk (21) and transfer the data. Thus, the operation (program) following step a in FIG. 3B is started (started).

The command execution section (14) of the floppy disk drive device (10) which receives this command uses the information of the track number TR (k) written in the parameter register of the interface circuit (11) as the mechanical deck system controller (19). ) Is transmitted (step a) and the flag written in the parameter register is cleared (step b). As a result, the host computer (1) detects that this flag has been cleared,
The track number TR (k + 1) of the track to be reproduced next is written in the parameter register of the interface circuit (11), and at the same time, a flag indicating that the track number is written in this parameter register is also written in this parameter register (set). To).

The mechanical deck system controller (19) which has received the information of the track number TR (k) controls the motor (22) to move the magnetic head (20) to the track of the number TR (k) (step c). . When this movement of the magnetic head (20) is completed and this is transmitted from the mechanical deck system controller (19) to the instruction execution section (14), the rotation of the floppy disk (21) causes the predetermined sector to be erased. When coming to the magnetic head (20), the instruction execution unit (1
4) controls the recording / reproducing / erasing circuit (18) and causes the magnetic head (20) to reproduce the data of the sector of the track (step d).

When the reproduction of the data in the sector is completed, the instruction executing section (14) determines whether or not the flag is set in the parameter register (step e), and if "N",
Although the process proceeds to step h which will be described later, if it is “Y”, the information of the track number TR (k + 1) written in the parameter register of the interface circuit (11) is transmitted to the mechanical deck system controller (19) (step Along with f), the flag written in the parameter register is cleared (step g).

The mechanical deck system controller (19) which has received the information of the track number TR (k + 1) controls the motor (22) to move the magnetic head (20) to the track of the number TR (k + 1) and at the same time, to move it. In parallel, the data which is reproduced from the sector of the track numbered TR (k) and stored in the buffer memory (13) via the data demodulation circuit (17) is processed by the error correction processing section (15). , Error detection and error correction processing is performed for each sector (step h), and then the data is read from the buffer memory (13) and transferred to the host computer (1) through the interface circuit (11) (step i). . here,
The error correction processing in a broad sense includes error detection. Only the error correction processing in the broad sense may be performed during the movement of the magnetic head (20).

After this, the number TR (k +
If the tracks 2), TR (k + 3), ... Are reproduced, the above operation is sequentially repeated.

Thus, the time required from the host computer (1) requesting the reproduction of data over several tracks until the data is transferred to the host computer (1) is shortened.

Next, rules for setting and clearing flags for the parameter register of the interface circuit (11) will be described. When the data of the track number of the floppy disk (21) to be reproduced from the host computer (1) is written in the parameter register of the interface circuit (11), the flag is set in the parameter register at that point and the track is re-recorded. It is prohibited to write the number data. When the information on the track number written in the parameter register is transmitted to the mechanical deck system controller (19), the flag is cleared, indicating that the next track number can be written in the parameter register.

In the above example, the track number is written,
In the parameter register of the interface circuit (11),
I have described the case of setting and clearing the flag,
The flag itself is not limited to this. For example, even if the flag itself is not read from the host computer (1),
The instruction execution unit (14) may interrupt the host computer (1) when the flag is cleared.

G ₄ Operation was then related to the buffer memory, with reference to Figure 2, an operation associated with the buffer memory (13). As described above, the buffer memory (13) is composed of five memory areas (13A) to (13E), each having a capacity of 6 Kbytes. still,
A 2-byte spare area in the buffer memory (13) is not shown.

The buffer memory (13) is controlled by the host computer (1) via the interface circuit (11) and the microprogram control unit (12). The data reproduced from the floppy disk (21) and supplied through the recording / reproducing / erasing circuit (18) and the data restoring circuit (17) is written into the buffer memory (13), and the error correction processing section (15) The error-corrected data is read out, and the error-corrected data is read out and transferred to the host computer (1) via the interface circuit (11).

As described above, the host computer (1) stores the track area (7 bits) and the sector number (2 bits) together with the memory area number (3 bits) [memory area (13A)] in the parameter register of the interface circuit (11). , “13B”, “13C”, “13D”, and “13E” corresponding to “000”, “001”, “010”, “011”, “10”
0 "], sector mode and track mode discrimination data (1 bit) are set.
The buffer memory (13) has a microprogram controller (1
Controlled by 2).

First, the track mode (when the discrimination data is "1")
The case will be described. The magnetic head (20) is moved to the track to be reproduced. After the index signal of the track is reproduced by the magnetic head (20), the floppy disk (21) rotates once more,
Four sectors of data from the track are reproduced, and the reproduced data is demodulated and then written to the memory areas (13B) to (13E) of the buffer memory (13). The data for the four sectors is stored in the error correction processing unit (1
The error is corrected for each sector by 5) and then transferred to the host computer (1) through the interface circuit (11). The same operation is performed on the other tracks of the floppy disk (21), and the contents of the memory areas (13B) to (13E) are rewritten by the data of the four sectors of the track, error-corrected similarly, and the host computer Transferred to (1). In this track mode, data of four sectors of the track is always written to the memory areas (13B) to (13E). The host computer (1) manages track numbers of data stored in the memory areas (13B) to (13E).

When data such as a program is recorded in units of tracks on the floppy disk (21), the data is reproduced in units of tracks and written into the buffer memory (13).
The error correction processing section (15) performs error correction for each sector and then transfers the data to the host computer (1) through the interface circuit (11), so that the data processing time is shortened.

Next, the case of the normal mode in the sector mode (when the determination data is “0”) will be described. Magnetic head (20)
Is moved to the track to be reproduced. After the index signal of the desired track is reproduced by the magnetic head (20), the floppy disk (21) is further rotated once, and then the data of one desired sector of the track is reproduced, and the reproduced data is reproduced. After the data is demodulated, it is written to the memory area (13A) of the buffer memory (13). The data for one sector is error-corrected by the error correction processing unit (15), and then transferred to the host computer (1) via the interface circuit (11). The same operation is performed for the other sectors of the floppy disk (21), and the contents of the memory area (13A) are rewritten by the data of the sector, similarly corrected for errors, and transferred to the host computer (1). .
In the normal mode of the sector mode, data of the sector is always written in the memory area (13A). The host computer (1) manages the track number and sector number of the data stored in the memory area (13A).

Further, the case of the special mode in the sector mode (when the determination data is "0") will be described. Magnetic head (20)
Is moved to the track to be reproduced. After the index signal of the desired track is reproduced by the magnetic head (20), the floppy disk (21) is further rotated once, and then the data of one desired sector of the track is reproduced, and the reproduced data is reproduced. After the data is demodulated, the data is written to, for example, a memory area (13A) of the buffer memory (13). The data for one sector is error-corrected by the error correction processing unit (15), and then transferred to the host computer (1) via the interface circuit (11). Playback data from another sector is written into the next memory area (13B) of the buffer memory (13), and playback data from another sector is similarly written into the memory area (13B).
C), (13D), (13E), (13A), and ‥‥ are sequentially and cyclically written to correct errors. in this case,
In the host computer (1), a pointer indicated by a triangle mark is provided in FIG. 2. For example, when data is written in the memory area (13C), the pointer corresponding to the number of the memory area (13C) is replaced with the next memory. Move to correspond to the number of area (13D). The pointers are stored in memory areas (13A), (13B), ‥‥, (13E),
(13A) Move sequentially and cyclically to each corresponding number of ①. The host computer (1) manages the numbers of the memory areas (13A) to (13E) of the buffer memory (13) and the track number and sector number of the data stored in the memory area as a header. , The error-corrected data stored in the memory area is
The data of the memory area number is supplied from the host computer (1) to the microprogram control unit (12) via the interface circuit (11), so that the desired track stored in the buffer memory (13) is desired. The data in the sector is repeatedly transferred to the host computer (1). In this case, there is no need to correct the error again, and the data is immediately transferred. This allows
The host computer (1) is connected to a floppy disk (2
1) When the data of a certain sector of a certain track is repeatedly used, the data is recorded by the magnetic head (20).
Thus, the waiting time from the reproduction to the capture by the host computer (1) is greatly reduced.

Even in the normal mode of the sector mode, when the host computer (1) adopts the pointer, the pointer may be fixed to the number of the memory area (13A).

In this way, the buffer memory (13) is provided with the memory areas (13A) to (13E), the recorded data is reproduced from the floppy disk (21) in track units or sector units, and after demodulation, the buffer memory (13). Since the error correction is performed by the method, the processing time of continuous long data in track units can be shortened, and short data in sector units can be processed in the same manner as in the past, and transferred to the host computer (1) many times. Since the data can be stored in the buffer memory (13) until its use is completed, the processing time of the data can be shortened.

The number of memory areas in the buffer memory (13) is
Various modifications such as a plurality of sectors and a plurality of tracks are possible.

In addition, the memory area (13A) of the buffer memory (13)
Since the number of (13E), the track number and the sector number to which the data stored in the memory areas (13A) to (13E) belong are managed on the host computer side,
Its management and control of the buffer memory (13) become easy. Incidentally, it is conceivable to manage this management and control on the side of the ADC (advanced disk controller) [particularly, its instruction execution section (14)], but if this is done, the load on the ADC side will be heavy. In that case, buffer memory (13)
Memory area (13A) to (13E) number, the track number to which the data stored in the memory area (13A) to (13E) belongs, and the sector number are part of the buffer memory (13). Alternatively, it is stored in another memory.

G ₅ data recording format Next, with reference to FIG. 4 to 9 Fig, described two inches data recording format of the floppy disk.

[Track format]

FIG. 4 shows a track format. One track is composed of an index and four sectors # 0 to # 3. One track includes a gap 0 (prefix index gap), an index, a gap 1 (post index gap), a sector # 0: a gap 2 (sector gap), a sector # 1, a gap 2 (sector) sequentially from the data start position. Gap), sector # 2, gap 2 (sector gap), sector #
3, gap 2 (final gap). The index is a continuous Tmax signal. In addition, 1F (frame) is 44B
(Byte), and 1B consists of 10 channel bits.

Sector # 0 of each track of floppy disk (21)
The boundaries of the four sectors from # 3 to # 3 coincide in the radial direction. PG is a rotation phase detection signal generated according to the rotation of the spindle motor that rotationally drives the floppy disk (21), and is associated with the index.

[Sector format]

FIG. 5 shows the sector format. One sector is composed of sequential preamble data “2B”, synchronization frame, subframe, and coding data (data frames 0 to n).
127) and the postamble “2B” and has a length of 5765B.

[Synchronous frame format]

FIG. 6 shows a sync frame format. One frame is composed of 11 sets of a sequential sync 1, sync 2, EPS (frame pre-sync) and parity [4B (B = byte)], and has a length of 44B.

[Zab frame format]

FIG. 7 shows the subframe format. One sub-frame is composed of sequential synchronization, sub, frame address, parity, mode, track number, and sector number (0 #, 1
#, 2 #, 3 #), head number, copy protection, spare area, and C1 parity (4 symbols) and have a length of 44B.

[Data frame format]

FIG. 8 shows the data frame format. One data frame consists of sequential, synchronization, sub, frame address, parity, coding data (32 symbols), C2
Parity (4 symbols) and C1 parity (4 symbols)
And has a length of 44B.

[Subcode]

FIG. 9 shows the subcode. The Cobb code has 128 sub data in one data frame. The subcode assembly includes subcodes # 0, # 1, # 2, and # 3. One subcode consists of sequential mode, track number, sector number, head number, copy protection, spare area, C1 parity (4 symbols), and has a length of 32B.

Formation of G ₆ Parity Next, formation of C 2 parity and C 1 parity by the error correction processing section (15) will be described with reference to FIG. Incidentally, this tenth figure is shown a data frame to be involved in the formation of C2 parity and C ₁ parity of the data constituting one sector, and a sub-frame involved in the formation of the C1 parity. C2 parity (error correction code)
It is formed by interleaving a plurality of C2 sequence symbols (coding data) extending from the upper left to the lower right in the figure among the plurality of symbols arranged in a matrix. The C1 parity (error correction code) is formed from a plurality of C1 sequence symbols (frame address, coding data, and C2 parity) extending vertically from top to bottom in the drawing. Note that, for the subframe, only the C1 parity is formed. For example, a Reed-Solomon code is used for the C1 parity and the C2 parity. Further, the sub-code in the data frame is formed of four sub-codes S ₈₀ to S ₇₉ having the same content in the horizontal direction of the figure over 128 frames.

G ₇ Memory area map Next, buffer memory (13) during data playback
FIG. 11 shows a map of the memory areas (13A) to (13E). This memory area is 6K bytes (= 61
It has a capacity of 44 bytes = 128 × 48 bytes), and coding data for 128 frames (one sector) is written in the area of 32 × 128 bytes on the left side in the figure. Also, C2
The parity and the C1 parity are respectively written in 4 × 128 byte areas adjacent to the area where the coding data is written. The read flag indicating the data writing time and the C1 correction flag according to the result of the error correction decoding using the C1 parity are written in the 1 × 128 byte area at the right end in the figure. The read flag and the C1 correction flag are set for each frame, and the read flag and the C1 correction flag for each frame are written in the same byte (8 bits). Also, the frame address is 1 × 128 adjacent to this area.
Written to byte area. Further, the sub-code S ₈₀ to S ₇₉ having the same contents are written in the area of 1 × 128 bytes adjacent to the region to be written of the frame address. In the 1 × 128-byte area adjacent to this area, the upper 4-byte area in the figure is an area for setting a correction flag based on the parity of the subcode, and the lower 7-byte area is an error area. This area is used as an internal register of the correction processing unit (15). The hatched area in the figure is an unused area.

H According to the present invention described above, a disk drive device capable of shortening the time required from the request for reproduction of data over several tracks from the microcomputer to the transfer of the data to the microcomputer. Can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a floppy disk drive device to which the present invention is applied, FIG. 2 is an explanatory view showing its buffer memory, and FIGS. 3A and 3B are respectively the floppy disk of FIG. 4 to 9 are explanatory views showing the data recording format of the floppy disk, FIG. 10 is an explanatory view of forming parity, and FIG. 11 is a map of the memory area of the buffer memory. FIG. (1) Host computer, (10) Floppy disk drive, (11) Interface circuit, (12)
Is a microprogram control unit, (13) is a buffer memory, (13A) to (13E) are memory areas, (14) is an instruction execution unit, (15) is an error correction processing unit, (16) is a data modulation circuit, ( 17) is a data demodulation circuit, (18) is recording / playback,
Erasing circuit, (19) mechanical deck system controller,
(20) is a magnetic head, (21) is a floppy disk,
(22) is a head feed motor, and (23) is a spindle motor.

Claims (1)

(57) [Claims] 1. A head, a head control means for controlling the head, a buffer memory for storing data read from the disk by the head, and an error correction process for performing an error correction process on the data stored in the buffer memory. A head for responding to a data reproduction request of a desired track of the disc from the microcomputer to the disc driving device body, the head comprising the disc driving device body and a microcomputer for controlling the disc driving device body. Moves to the desired track of the disk, reads the data of the desired track, stores the read data in a buffer memory, performs error correction processing, and then transfers the data to the microcomputer. In the disk drive comprising In response to a data reproduction request from the computer to the disk drive device body for data over a plurality of tracks on the disk, the head moves to a desired track on the disk, and the data on the desired track After reading the buffer memory, and after the reading operation is completed, error correction processing of the data stored in the buffer memory is performed, and movement processing for moving the head to another desired track of the disk is performed. A disk drive device characterized by the above.