JPS6086622A - Input and output controller of disc device - Google Patents

Abstract

PURPOSE:To perform automatically an alternative processing in a high speed and reduce the memory capacity by providing an extension read/write instruction and an instruction, which indicates alternative cylinder address information, as instructions of a CPU. CONSTITUTION:The extension read/write instruction and configuration control word C and D instructions which indicate alternative cylinder address information are added to instructions executed for an I/O by the CPU. A control information storage part of an I/O controller is provided with a storage area of instructions, an area where information of a cylinder address where an operation is executed is stored, and a control byte area where a control byte which controls operations is stored. Bits indicating verification, alternative record processing, and alternative cylinder processing are set to the control byte. The write operation, the verifying operation, date erase for error, and the alternative processing are performed continuously with one task word. Thus, configuration control words C and D instructions are provided not only to perform the alternative processing automatically in a high speed but also reduce the memory capacity.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a microprogram control type input/output control device for controlling a device, and in particular, for reading, writing, verifying, canceling data, etc. of an optical disk device.
and the control portion of control of alternative processing operations.

<Prior Art> FIG. 1 shows the instructions of a central processing unit that controls a conventional optical disk device. Seek is to move the head to the cylinder indicated by configuration control word A, read is to read data from the record indicated by configuration control word B, and write is to write data to the record indicated by configuration control word B. FIG. 2 shows the configuration of a general input/output control device 2 and an example of the connection between the central processing unit 1 and the optical r-inuk device 3. Figure 3 shows optical disk plate 1'
The area of the L cylinder is shown. FIG. 4 CA) shows an example of the flow of a conventional write operation, and (B) 1l-1', 4
An example of the flow of a read operation after t'fl is shown. In FIG. 2, the input/output control device 2 includes an address register 100. It is composed of a data counter 101, a data register 102, a microprocessor 103, a control section 104, a micro 70 program storage section 105, and a control byte storage section 106.

Conventionally, this type of input/output control device receives a task word meaning a write operation from a central processing unit in order to control an optical disk device, as shown in FIGS. 1, 2, and 4A and B. When received, the corresponding device specified by the configuration control word B is selected, and when the device is selected, the record specified by the configuration control words A and B is searched, and when the target record is detected, the data is written. When the write operation is completed, the optical disk device is disconnected and an interrupt is generated to the central processing unit.

When the central processing unit receives this interrupt, it ends the write operation. Since the optical disk board used in optical disk devices cannot rewrite data once it has been written, the central processing unit must read the written data to check whether the write operation was performed normally. There is. Therefore, the central processing unit executes a task word meaning a read operation on the input/output device. When the input/output control device receives a task word indicating a read operation, it selects the device, searches for the record specified by the configuration control words A and B, and when the target record is detected, does not read the data. When the read operation is completed, the device is disconnected and an interrupt is generated to the central processing unit. When the central processing unit receives this interrupt, it checks for errors. If there is no error, the process ends normally; if there is an error, the central processing unit registers the previously written record as invalid in the management table in the software, extracts a record that can be replaced from the management table, and writes a new, separate record. Execute the write operation on the record again. After writing, as described above, it is necessary to execute a read command to confirm the normality of the data.

As mentioned above, conventionally, an interrupt occurs for each read operation for writing or verifying, and the processing speed of the central processing unit (CPU) slows down due to interrupt processing, and record cancellation and alternative processing are It has the drawback of requiring a large amount of memory capacity due to its complicated management table structure.

<Summary of the Invention> The present invention has been made to eliminate the above-mentioned drawbacks of the conventional technology.The purpose of the present invention is to instruct the instructions of the central processing unit with extended read/write instructions and alternative cylinder address information. A new instruction is provided to control the input/output control unit, and a storage area for storing the instruction, an area for storing information on the cylinder address in which the operation is being executed, and a control byte area for controlling the operation are provided in the storage unit where control information of the input/output control unit is stored. By setting bits in the control byte to indicate that the verify east alternative record is being processed or the alternative cylinder is being processed, independent operations such as write operation, verify operation, data cancellation, and alternative processing can be performed. By automatically performing the following steps (no record) → seek to alternative cylinder →, the number of interrupts to the central processing unit is reduced and the processing speed of the central processing unit is increased, and data cancellation and alternative processing are performed automatically by the central processing unit This system eliminates the need for detailed management, eliminates the need for a large amount of memory capacity, automatically cancels data and performs alternative processing without the central processing unit being aware of it, and allows optical disk devices to be controlled with the same program. An object of the present invention is to provide an output control device.

That is, according to the present invention, an instruction executed from the central processing unit to the input/output device includes an extended read/write instruction and a configuration control word C that instructs alternative cylinder address information.
D command is newly established, and the control information storage storage section of the input/output control device is provided with a storage area for instructions, an area for storing information on the cylinder address in which the operation is being executed, and a control byte area for controlling the operation. In addition, the control byte contains
Alternative record processing, alternative cylinder 1!1! By setting the focus to display the inside, in one task word,
An input/output control device that can continuously perform write operation, verify operation, data cancellation in the event of an error, and alternative processing is obtained.

<Example> Next, one example of the present invention will be specifically described with reference to FIG. 5 and the following figures.

An example of an instruction format and an example of memory allocation in an embodiment of the present invention are shown in FIGS. 5 and 6, respectively.

The extended read in Figure 5 is indicated by configuration control word B. If the data in the J record is invalid, alternative record processing is performed, and if there is no data corresponding to the alternative record, configuration control words C and D are used.
By automatically performing alternative cylinder processing based on
After the extended write writes data to the record indicated by the configuration control word B, it is verified, and if there is an error, the data is written to an alternative record and verified. If there is an error in the alternative record, alternative cylinder processing based on configuration control words C and D is automatically performed. Figure 10, 1st
FIG. 1 shows an example of the operation of the present invention. Figure 7A is a diagram showing the recording part of a record on an optical disk board, Figure 7B
is a table explaining the meaning of flag 22 in FIG. 7A. This flag has the meaning of identification information indicating the attribute of the record. Figure 8A is record 02 of cylinder 001
7 is a diagram showing that there is a data error in the record, and "'FO" is written in the flag section 22 as identification information indicating that the record is invalid. FIG. 8B is a diagram showing that the data to be written in record 02 of cylinder 11 has been replaced with record n-3 of cylinder 001.

FIG. 9 is an expanded view of FIG. 8, in which there is a data error in record 02 of cylinder 001, and a flag section 22 K:
``F O'' was written (Figure 9A) and alternative processing was performed to record n-3 of cylinder 001, but since there was an error in this record as well, the flag section 22K ``FO'' All writes l!Figure 9'B ), F (10) This is a diagram showing that alternative processing has been performed on record 01 of IJ yda (Fig. 9C)
. FIG. 10 is a diagram showing the progress of the operation of the alternative processing. FIG. 11 is a diagram showing the progress of the operation during the G1 operation. In FIG. 7, reference number 21 is the 5-byte ID part 1.
, reference number 22 is a 1-byte flag section, reference number 23 is a 5-byte ID section 2, reference number 24 is a data area, and reference number 25 is a defect in records 1 to n-4 on the same circumference. Indicates an alternative record area reserved for alternative use. In FIG. 7, ID part 1 is its own logical address, and Ip part 2 is its own logical address when the data in the following data area is valid, or if the record is in an alternative record area, the alternative optical address. Each indicates a logical address.

When a task word meaning an extended write command is executed from the central processing unit to the input/output control unit, the input/output control unit selects the device specified by configuration control word B, and when the device is selected, configuration control is executed. Information on the target record is obtained from the words A and B, and a record that matches this information with the information in the ID section 1 is searched.

If the target record is detected, write the logical address of that record (same as the contents of configuration control words A and B) at the beginning of the data section (I'D section 2 section) of that record, and then Writes data sent from the central processing unit. When the write operation is completed, the verify pit of the control byte C is set, and the data in the data section of the same record is read and verified. If the verified result is normal, it is determined that the write operation has been completed normally and an interrupt is made to the central processing unit. If there is an error in the verified result, the ID information (contents of ID section 1) of the record in which the error occurred is stored in the control byte cl, and the control byte C1
Search for the record indicated by .

If it is detected, write ``FO'' to the record flag section indicated by CI) to invalidate and cancel the data of that record.As a result, if the flag section is read during a read operation, the data of that record will be invalidated. ) Then, the alternative record area is searched to see if there is an unused alternative record in the alternative record area secured on the same circumference.Search As a result, if there is an unused substitute record, the information in the ID section 1 of that record is stored in the control pie (C2).At this time, the verify pit of the control pie (CO) is reset and the substitute record processing bit is set.

If the record indicated by control byte C2 is searched and detected, the substitution source logical address (same as the contents of configuration control words A and B) is written at the beginning of the data section (ID section 2 section), and then Write data.

After writing, the verify 7 eye bit of the control byte C2 is set, and the data in the data section of the record indicated by the control byte C2 is read and verified. Thereafter, the same operations as described above are performed. The above operation can be more easily understood by referring to FIGS. 8 and 10.

As a result of searching the alternative record area, if there is no unused alternative record, a seek operation is performed to the cylinder indicated by the configuration control word C. When the seek operation is completed, the alternate cylinder processing bit in control byte CO is set and configuration control words C and D are set.
Search for the record indicated by . If the target record is detected, the replacement source logical address (same as the contents of configuration control words A and B) is written at the beginning of the data section (ID section 2 section), and then data is written. Verification is performed after writing in the same way as described above. The above operation is shown in Figure 9.

This can be more easily understood by referring to FIG.

The operation explained above is as shown in FIG.
These operations are controlled by the microprogram of the input/output control section, and in particular, the information in the storage section that stores control information (cylinder information, records in which errors occur, verification bits, alternative records, processing bit, alternate/linda processing bit, etc.). This can be understood by referring to FIG.

From the above, by automatically performing write, verify, data cancellation, and alternative processing with a single command from the central processing unit, only one interrupt to the central processing unit is required, and the processing speed can be increased. Speed up and cancel data 2
It becomes possible to eliminate the need for detailed management of alternative processing by the central processing unit, and to eliminate the need for a large amount of memory capacity.

Next, when the central processing unit executes a task word meaning an extended read command to the input/output controller, the input/output controller selects the device specified by configuration control word B, and the device is selected. Then, information on the target record is obtained from the configuration control words A and B, and a record that matches this information with the information in the ID section 1 is searched. When the target record is detected, the flag section of that record is read. As a result of reading,
If the flag section is in an unwritten state, the data in the subsequent data section is read and transferred to the central processing unit, and when the read operation is completed, an interrupt is made to the central processing unit. As a result of reading the flag part of the record, if "F O" is written, that record has been substituted, and the data of the record is judged to be invalid, and the control/S2) CI is given a logical address ( A search is made for an alternative record in which the logical address indicated by control byte C1 is recorded at the beginning of the data section (ID section 2 part) of the alternative record area. If it is detected as a result of the search, store the contents of the ID section 1 of the record in the control pie) C2,
Control pie) Reads the data of the record indicated by C2 and transfers it to the central processing unit. If the alternative record area cannot be detected even after searching, seek to the cylinder indicated by the configuration control word C, and when the seek operation is completed, the same as above, the cylinder indicated by the control byte C1 is written in the ID section 2. Alternate record in which the logical address is recorded (initially configuration control word A
, B). If a result of the search is detected, the contents of the ID section 1 of the record are stored in the control pie C2, and the data of the record indicated by the control byte C2 is read out. These operations are controlled by the microprogram of the input/output control section, and are processed accurately by the control information of the storage section (cylinder information 1 cutting record processing bit, alternate cylinder processing bit, etc.).

This can be understood by referring to FIG.

From the above, by automatically performing alternative processing in response to a single command from the central processing unit, only one interrupt to the central processing unit is required, and the processing speed can be increased. This eliminates the need for detailed management and eliminates the need for a large amount of memory capacity.

<Effects> As explained above, the present invention adds extended read/write instructions and configuration control words C and D instructions to the instructions of the central processing unit, and creates a storage area for the instructions in the storage section of the input/output control section. An area for storing cylinder address information during operation execution,
Write and verify operations are performed by providing a control byte area and setting bits in the control byte to indicate whether verification is in progress, alternative record processing is in progress, or alternative cylinder processing is in progress.

Data cancellation 2 Alternative processing can be performed automatically and quickly,
The central processing unit does not require detailed management of alternative processing, requires less memory capacity, reduces the number of interrupts, and can control optical disk devices with improved processing speed.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the conventional command format, Fig. 2 is a block diagram showing the general input/output control configuration, and Fig. 3 shows the relationship between the data 7 cylinder of the optical disk board and the alternative cylinder. 4 shows a conventional operation example, FIG. 5 shows an instruction format according to an embodiment of the present invention, and FIG. 6 shows an example of memory allocation according to an embodiment of the present invention. Figure 7. 8 and 9 are diagrams each showing a recording example used to explain the operation of the present invention, FIG. 10 is a flowchart showing an example of a write operation in this invention, and FIG. 11 is a diagram showing an example of a read operation in this invention. The flowchart, FIG. 12, briefly shows the write operation in this invention.Isk device, 100...address recorder, 101...data counter, 102...
・Data reno star, 103... microprocessor,
104... Control unit, 105... Micro program storage unit, 106... Control byte storage unit, 11... Optical disk board, 12... Alternative cylinder area, 13... Datan ring area, 21 .23...ID department, 22...
- Flag section, 24 - Data area, 25... Alternative record area. Patent Applicant NEC Corporation Agent Takuo Kusano 1 Diagram 2 Diagram 3 t'c,u'',,,++;9'Oki 5 Diagram+01000004 Broadbow Flea Lead+01000011tl Issue 4 Mouth Prize Belao 6 Figure offing 7 Figure 1゜

Claims (1)

[Claims] In an input/output control device that controls read/write operations, etc. of an optical disk device based on commands from a central processing unit, a storage section in which control information is stored by a microprogram in a control circuit for controlling the optical disk device; The instructions executed by the central processing unit include an extended read/write instruction and an instruction for instructing alternative cylinder address information, and the storage unit includes an area for storing alternative cylinder address information received by the instruction, and a current An area for storing cylinder address information during execution of an operation and a storage area for storing control bytes necessary for the operation are provided, and the control byte includes information during alternate record processing, alternate cylinder processing, and verification execution. 1. An input/output control device for a disk device, wherein a bit indicating the inside of the optical disk device is set, and control of the optical disk device, particularly alternative processing operations, is automatically performed based on control information in these storage sections.