JPH0827777B2 - Data processing device - Google Patents

Description

DETAILED DESCRIPTION [Table of Contents] Outline Industrial field of application Conventional technology (Fig. 8) Problems to be solved by the invention Means for solving problems (Fig. 1) Operation Example (1) ) Configuration of Embodiment (FIGS. 2 to 5) (2) Operation of Embodiment (FIGS. 6 and 7) Effect of the Invention [Outline] Peripheral device for small computer standardized by ANSI of American standard Interface (Small Computer System In
terface, SCSI interface) that prepares a device-compatible command table to control different types of I / O devices with the same program, and obtains different command parameters for this device from the command table, CDB
By creating the above, the SCSI interfaces of different types of input / output devices can be controlled by one program.

[Industrial applications]

The present invention is a command information storage block (CDB;
description block), in order to control different types of I / O devices that use the SCSI interface standardized by ANSI with the same program.
CDB with required parameters for each I / O device
The present invention relates to a data processing device adapted to automatically create.

[Conventional technology]

In the data processing device, various input / output devices,
For example, a magnetic disk device, an optical disk device, a floppy disk, a cassette type magnetic tape device, etc. are connected.

For example, as shown in FIG. 8, when a magnetic disk device 31, an optical disk device 32, a floppy disk 33, a printer ... Are connected to the terminal device 30, a channel 34,
35, 36 ... are provided and this is a magnetic disk control program.
37, the optical disk control program 38, the floppy disk control program 39, etc. were controlled by the control programs prepared for each input / output device.

That is, each input / output device has a different data format such as a data length or an address, and the hardware input / output interface differs accordingly, so that independent control programs are required.

By the way, recently, in the United States, the peripheral device interface (SCSI interface) for the small computer standardized by the American National Standard (ANSI) was defined, and the format of the 1 / O command was defined in the input / output device of this SCSI interface. .

[Problems to be solved by the invention]

By the way, the SCSI interface
Even if the I / O commands are determined to have the same format, each input / output device has different parameter information such as an address and a data length. Therefore, since the parameter information adding means for creating the device corresponding to the device has not been developed, there has been a strong demand for its development.

An object of the present invention is to provide a data processing device for satisfying such a demand.

[Means for solving problems]

In order to achieve the above object, the present invention provides a device-compatible command conversion table 1 as shown in FIG. In this device-corresponding command conversion table 1, command parameter information peculiar to, for example, the optical disk device 2, the cassette type magnetic tape device 3 or an input / output device connected to the terminal device is described.

[Operation] Therefore, when a command is output from the terminal device to the input / output device, the I / O command for the input / output device can be assembled by referring to the device conversion command conversion table 1. Can be controlled by the same program.

〔Example〕

(1) Configuration of Embodiment An embodiment of the present invention will be described with reference to FIGS. 2 to 5.

FIG. 2 is a block diagram of an embodiment of the present invention, FIG. 3 is an input parameter format, FIG. 4 is a device-compatible command conversion table format, and FIG. 5 is a CDB format example.

In FIG. 2, the same parts as those in the other figures indicate the same parts,
4 is a control unit, 5 is a CDB creation unit, 6 is a CCW (channel command word) creation unit, 7 is a handler unit, 8 is an input unit,
Reference numeral 9 is an output unit, 10 is a terminal device, and 11 is a channel unit.

The control unit 4 comprehensively controls the input / output devices connected to the terminal device 10. For creating the CDB,
When an access request for an input / output device connected to the terminal device 10 is transmitted from the outside, a device (not shown)
The type of the input / output device is detected by the table block (DTB), and this is transmitted to the CDB creating unit 5, the CCW creating unit 6, and the like.

The CDB creating unit 5 creates unique parameter information for the input / output device of the access destination based on the conversion table 1. CDB has multiple formats, and when reading an optical disc, as shown in FIG. 6, a command, a unit number, a block address indicating a read position, a transfer block number, a manufacturer specific information area RB, EF
Etc. are entered. When reading a cassette type magnetic tape device, as shown in the figure, the command, unit number, transfer block number, manufacturer specific information area SLi
Etc. are entered (there is no block address).

The CCW creating unit 6 creates a CCW in which data to be executed by the channel unit 11 is written and outputs its position, and at the same time, the CDB is also transmitted to the channel unit 11. The address of the CDB is also written in this CCW, and the CDB can be read by decoding the CCW.

The handler unit 7 is conscious of the logical structure in the input / output device. For example, when an external device requests the optical disc device 2 to read data from the first 1 block to the 10th block of the file A. , The first block to the 10th block of the file A are converted into relative addresses in the volume.

The input section 8 is for inputting information from the outside,
The output unit 9 outputs data for the channel unit 11.

The channel section 11 is connected to a plurality of input / output devices of a SCSI interface, such as an optical disk device 2 and a cassette type magnetic tape device 3.

The device-corresponding command conversion table 1 is configured in a memory (not shown) in a format as shown in FIG. 4, and includes a CDB type indicating a CDB type (group), a command code indicating a command code to be set in the CDB, A block having a block address position that indicates the number of bytes from the beginning of the CDB, a block address area size that indicates the size of the block address area in the CDB, and a block address maximum value that indicates the maximum value of the block address that can be specified in the CDB. Address information, transfer block number position indicating the number of bytes from the beginning of the CDB, transfer block number area size indicating the size of the transfer block number area in the CDB, and maximum transfer block number that can be specified in the CDB The transfer block information that has the maximum value of the transfer block number and the code that indicates the number of bytes from the beginning of the CDB Including processing mode information and the like having a control byte scope indicating a valid bit in the control byte of the trawl byte positions and the CDB. At this time, the block address information and the transfer block information are configured in the order of the position in the CDB, the parameter size, and the specifiable range, as described above.

The CDB format is, for example, FIG.
As shown in (c), a plurality of items are defined. These formats are selected according to the size of the data handled by the input / output device, and the larger ones also have a larger address length and transfer amount, so a large capacity format is selected. The cassette type magnetic tape device is selected as shown in FIG. 5 (a), and the optical disc device is selected as shown in FIG. 5 (a) or (b). In FIGS. 5B and 5C, “Rel Adr” indicates whether it is an absolute address or a relative address.

In FIG. 3, the command mode in the input parameter format indicates the lower mode of the command. For example, if transmission is requested even if there is an error in the transfer data, this is designated. In this case, the CDB has an optical disk (Read) shown in FIG.
As shown in, EF (error free) is written in the control byte.

(2) Operation of Embodiment Prior to detailed description of the operation of the present invention shown in FIG. 2 based on the flowchart of FIG. 7, a brief explanation will be given with reference to the CDB creation state explanatory view shown in FIG.

When an instruction to read 10 bytes from the first 1 byte of the file A of the optical disk device 2 is input to the terminal device 10 from an external device, the control unit 4 causes the input / output device name of this access destination (in this example, From the optical disk device) to CCW the pointer of the device table (DTB) not shown.
The data is transmitted to the creating unit 6, and the access data of the file of the optical disk device 2 is transmitted to the handler unit 7. The handler unit 7 converts this physical address into a relative address within the volume, that is, a physical address, and this is transmitted to the CCW creating unit 6 and the CDB creating unit 5 via the control unit 4. The CCW creation unit 6 uses the pointer transmitted from the control unit 4 to send the DT
B is accessed to access a link destination of a channel control block (CCB) (not shown), and the optical disk device 2 is connected to the channel section 11 by the channel ID written in this, and the channel section 11 is SCSI. Recognize that it is an interface. And this
The CCW creating unit 6 instructs the CDB creating unit 5 to create a CDB. At this time, in the CCW creation unit 6 and the CDB creation unit 5, the unit number (logical address) existing in the control unit 4 or the input data, the command name (Read in this example), the command mode, the relative address in the volume ( Since it is transmitted together with the block address) and the number of processing blocks (10 bytes in this example), the CCW creating unit 6 creates a CCW in which a command name, a unit number, etc. are entered. At this time CDB
The creation unit 5 creates the CDB attached to this CCW by the device-compatible command conversion table as described later.

By the way, when reading data from the optical disc device, the optical disc device Re
As shown in FIG. 6, CDB type, command code, block address information, transfer block information, processing mode information, and the like are described in the ad section, so the CDB creating unit 5 refers to these and A CDB (optical disk, Read) as shown in FIG. 6 is created. Then, the address of the CDB is added to CCW and transmitted to the channel unit 11.

When reading data from a cassette-type magnetic tape device, also refer to the Read section of the cassette-type magnetic tape device in the device-compatible command conversion table in the same manner.
Will be created. At this time, the cassette type magnetic tape device does not have a function to access data from a specific position on the tape, and it always accesses from the beginning.
B does not need a block address indicating the access position from the beginning and does not have this data.

Next, the operation of the CDB creating unit 5 will be described with reference to FIG.

The CDB creating unit 5 searches the relevant part of the device-compatible command conversion table (hereinafter referred to as conversion table) 1 by the transmitted device name (optical disk device, cassette type magnetic tape device ...) And command name (Read, Write ...). To do.

The CDB type of the conversion table 1 is used to acquire a CDB area of a size corresponding to the CDB type, and the acquired area is cleared to zero.

Set CDB common parameters in the CDB area. This common parameter includes the command code (Operation Co
de), unit number (Logical Unit Number, device logical number), etc. are entered.

Next, the CDB creating unit 5 determines whether or not the block address position of the relevant portion of the conversion table 1 is zero and checks the presence or absence of the block address. In the case of an optical disk device or magnetic disk device, data can be accessed from any address, but the block address position is not zero, but in the case of a cassette type magnetic tape device, it is configured to access from the first block. Therefore, the block address position is zero.

If the block address position is not zero, there is a block address. Next, it is confirmed that the value of the block address of the input parameter in FIG. Check sex.

If it is valid, the block address of the input parameter is set in the CDB (the acquisition area) based on the block address position in the conversion table 1.

The CDB creating unit 5 determines whether or not the transfer block number position of the relevant portion of the conversion table 1 is zero, and checks the presence or absence of the transfer block number. At this time, the number of transfer blocks is zero when the command is for requesting the check of the state of the input / output device or for requesting the lock of the case in the case of the optical disk device.

If there is a transfer block, it is confirmed that the value of the number of processing blocks of the input parameter is within the maximum value of the number of transfer blocks in the conversion table, and the validity is checked.

When appropriate, the number of transfer blocks is set in the CDB based on the position of the number of transfer blocks in the conversion table 1.

The CDB creating unit 5 determines whether or not the control byte position of the relevant portion of the conversion table 1 is zero, and checks the presence or absence of processing.

If there is a processing mode, the validity of the command mode of the input parameter is checked by confirming that it is within the valid position of the control byte in the conversion table 1.

If appropriate, set the control byte in the CDB based on the control byte position in conversion table 1.

The CDB created in this way as shown in Fig. 6 is CCW.
It is also sent to the channel device 11. Channel device 11
Will access the specified I / O device based on this CCW and CDB.

In the embodiments of the present invention described above, examples of an optical disk device, a cassette type magnetic tape device and the like have been described as input / output devices, but the present invention is not limited to these, and magnetic disk devices, printers and other devices may be used. It can also be applied to things.

〔The invention's effect〕

According to the present invention, since command parameters unique to each input / output device can be created by the same control program by referring to the conversion table, all input / output devices of the SCSI interface are controlled by one program. It becomes possible.

Further, even when a new input / output device of the SCSI interface is connected to the channel unit 11, it is only necessary to add the unique command parameter information required for the input / output device to the conversion table.

[Brief description of drawings]

FIG. 1 is a principle diagram of the present invention, FIG. 2 is a configuration diagram of an embodiment of the present invention, FIG. 3 is an input parameter format, FIG. 4 is a device-compatible command conversion table format, and FIG. An example of the format, FIG. 6 is an explanatory diagram of a CDB creation state in the present invention, FIG. 7 is an operational explanatory diagram of the present invention, and FIG. 8 is a conventional example. 1 ... Device command conversion table 2 ... Optical disk device 3 ... Cassette type magnetic tape device 4 ... Control unit, 5 ... CDB creation unit 6 ... CCW creation unit, 7 ... Handler unit 8 ... Input unit , 9 …… Output section 10 …… Terminal device, 11 …… Channel section

Claims (1)

[Claims] 1. A data processing device for generating a command unique to a peripheral device from an input / output command controlling a peripheral device for a plurality of small computers, and an input / output command controlling the peripheral device and a device specific to the peripheral device. Device corresponding command storage means for storing input / output information of the command, and command creating means for creating a command peculiar to the peripheral device from the input / output command based on the device corresponding command storage means. Data processing device.