JPH0516099B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a recording medium read/write control method for controlling reading and writing of a recording medium such as a floppy disk (hereinafter also referred to as a sheet), and in particular, relates to a recording medium read/write control method for controlling reading and writing of a recording medium such as a floppy disk (hereinafter also referred to as a sheet), and in particular, The present invention relates to effective control when a TSP disk device or a plurality of types of recording media are read and written by a common recording medium read/write control means.

[Prior Art] Conventionally, the floppy disk controller 1 is
As shown in FIG. 1, it was located between the host system 2 and the floppy disk device 3, and controlled the floppy disk device 3 according to commands from the host system.

Furthermore, with the remarkable progress in magnetic recording technology in recent years, the recording density of recording media for floppy disk devices and the like has increased. As a result, previously
Compared to a recording medium that recorded at 48 TPI and a transfer rate of 250 KBit/second (hereinafter referred to as A type sheet), a recording medium with a recording capacity of 96 TPI and a transfer rate of 500 KBit/second (hereinafter referred to as B type sheet) has four times the recording capacity. ) appeared.

In addition to the previous floppy disk device that can read and write A type sheets (hereinafter referred to as A type device), there is also a floppy disk device that can read and write both A type sheets and B type sheets (hereinafter referred to as B type device). was developed.

[Problem to be solved by the invention] However, the basic specifications of the former A type device and the latter B type device are different, and when actually controlled with a floppy disk controller,
As shown in FIG. 2, two controllers 1A and 1B were required. Therefore, if you want to control the B type device 3B, you have to prepare and install a controller board for that purpose, which has disadvantages such as reducing the storage space for other controller boards and increasing costs. .

Further, in a drive such as a B-type drive that can read and write recording media of different recording types, there is a problem in that when a recording medium is removed and replaced, it becomes difficult to know which type of recording medium is set.

Particularly in devices such as floppy disk drives where the floppy disk can be easily replaced at any time, if the recording type of the installed recording medium is not correctly recognized,
READ/WRITE ERROR frequently occurred, and in the worst case, there was a risk of losing the recorded contents.

This invention was made in order to eliminate the above-mentioned drawbacks, and allows a common controller to control multiple devices with different basic specifications, or a recording medium read/write control that can efficiently and correctly control different types of recording media. The purpose is to obtain a method.

[Means for Solving the Problems] (1) A recording medium reading control method according to the present invention uses a recording medium control means for controlling read/write operations on a recording medium and a recording medium reading/writing device for reading/writing from a recording medium. This is a recording medium read/write control method for reading and writing data on recording media of different recording types, and includes the following steps.

(a) an identification information retention step for retaining identification information for identifying the recording type of the recording medium; (b) a recording medium in the recording medium read/write device;
(c) a replacement sensing step for sensing and storing whether the storage medium in the storage medium read/write device has been replaced;
a change status determination step of determining whether there is a possibility that the recording medium has been replaced since the previous read/write operation for the recording medium read/write device, based on the memorization result of the replacement sensing step; (d) the recording medium has been replaced by the change status determination step; an initializing step of initializing a recording medium control means so that the recording medium in the recording medium read/write device can be read and written using the identification information held in the identification information holding step; e) An execution step of executing a data read/write operation on a recording medium in the recording medium read/write device using the recording medium control means initialized in the initialization step.

(2) Also includes a recording medium control means for controlling reading and writing operations on the recording medium and a means for reading and writing from the recording medium.
This is a recording medium read/write control method for reading and writing data on recording media of different recording types using the above recording medium read/write device, and includes the following steps.

(a) an identification information holding step for holding identification information for identifying the recording type of the recording medium; (b) when there are two or more recording medium read/write devices;
(c) a device change determination step of determining whether the recording medium read/write device that is about to read/write data is the same as the recording medium read/write device that read/write data immediately before; (c) the recording medium in the recording medium read/write device is
(d) a replacement sensing step for sensing and storing whether the storage medium in the storage medium read/write device has been replaced;
a change stator determination step of determining whether or not the recording medium read/write device may have been replaced since the last read/write operation on the recording medium based on the memorized result of the replacement sensing step; (e) a device change determination step of the recording medium read/write device; If it is determined that the recording medium is different, or if it is determined in the change status determination step that the recording medium may have been replaced, the identification information held in the identification information retention step is used to update the recording medium read/write device. an initializing step of initializing a recording medium control means so that it can read and write data from a certain recording medium; (f) executing a data read/write operation on a recording medium in a recording medium read/write device using the recording medium control means initialized in the initialization step; execution process.

[Operation] In the present invention, the identification information is information representing the drive type, sheet type, transfer rate, etc., and the identification information holding step holds this identification information.

The replacement sensing step detects whether the recording medium may have been replaced and stores the state change.

In the change stator determination step or device change determination step, a change in the state of the recording medium or a change in the recording medium read/write device is determined prior to reading or writing from the recording medium.

As a result, if there is no change in the status or device, it is determined that the reading/writing is to the same recording medium as the one read/written immediately before, and the reading/writing is performed as is.

If there is a change in the status, it is determined that the reading/writing is to a recording medium different from the recording medium that was read/written immediately before, and the recording medium read/write control means performs an initialization process based on the identification information held in the identification information holding process. Initialize.

When initializing in this way,
This is reduced to the necessary minimum, and efficient control can be achieved even when a common recording medium read/write control means controls a plurality of recording medium read/write devices or a plurality of types of recording media.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 3 is a block diagram illustrating an example of the recording medium read/write control method of the present invention.

30 is a floppy disk controller which is an example of a recording medium read/write control means. In this example, the device identification function is achieved by providing a device identification switch SW. In FIG. 3, 31 is the SW. 32 is an initialization set register composed of a D-type flip-flop D-F/F, and is an initialization set register for initializing the floppy disk controller FDC and the timing signal generator VFO for controlling each device. 33 is a floppy disk controller FDC, which is composed of an LSI described below. 34 is a timing signal generator VFO, which generates a window (WINDOW) signal for reading and writing, and is composed of an LSI described below. 35 is D- for selecting a floppy disk (FD) device connected to the controller 30;
This is a register composed of F/F.

In addition, 36 is a decoder, 37 is a write data (WRITE DATA) timing correction circuit, 38 is a buffer, and 39 is an oscillator OSC that oscillates at 16MHz.
When initialized to one type, the controller has an operating configuration similar to that of a conventional floppy disk controller.

As an overview of the control method according to the embodiment of the present invention, first, before the host system 2, which is an example of a read/write request system, issues a command to actually control the devices FD1 to FD4, it senses the contents of the device identification switch SW31. The host system 2 compares the contents of the identification signal with the number of the device to be controlled, and learns whether the device is a 48TPI A type device or a 96TPI B type device. and FDC33 in suitable condition
and sends a command to the initial set register 32 to initialize the VFO 34.
Once the FDC33 and VFO34 LSIs have been initialized, the host system 2 can perform normal READ,
Execute WRITE. Loading identification signal and FDC3
3. Since the VFO 34 is initialized when the device is changed as explained below, the effect on the access time of the floppy disk device is minimal.

Here, the details of the above-mentioned system configuration will be explained below.

The device identification switch 31 is composed of a DIP type mechanical switch as shown in FIG. ~It is provided corresponding to FD4. For example, if FD1 is A type with 48 TPI, switch SW1 should be turned OFF in advance.
Conversely, if FD1 is a B type with 96 TPI, switch SW1 must be set to ON in advance. Similarly, the switches SW2 to SW4 of the FDs 2 to 4 are set to OFF or ON depending on whether they are of type A or type B (identification information holding step). 311～
312 is NAND with Schmitt trigger function
The gate circuit is a semiconductor IC manufactured by Mitsubishi Electric Corporation with the product name LS240, and the strobe signal 315 is generated when the host system 2 decodes the address.
Accordingly, the status information of each switch SW1-SW4 is transferred to the host system 2 via output lines 316-319 and loaded.

Next, the configuration of the initial set register 32 will be explained. Initial set register 32
is a D-F/F as shown in FIG. 5, and for example, a semiconductor IC manufactured by Mitsubishi Electric Corporation under the product name LS74 can be used.

The initial set operation is performed by setting the terminal Q of the initial set register 32 to "0" by giving "0" to the terminal DO from the host system 2.
The condition indicates type A. Further, by applying "1" to the terminal DO from the host system 2, the terminal Q of the initial set register 32 is set to "1", and the state is set to indicate the B type. In this way, either the "0" signal indicating the A type of the terminal Q or the "1" signal indicating the B type is given to the VFO 34, and if it is "0", then
Various timings for reading, writing, etc. of the VFO 34 are set to A-type signals, and the FDC 33 is set to be an A-type signal having an FDC 33 that operates based on these various timing signals. On the other hand “1”
In this case, VFO 34 and FDC 33 are similarly set for B type.

Next, the floppy disk controller FDC
33 will be explained. FDC33 is VFO34
It is possible to control both type A and type B by changing various timings from Therefore, its detailed configuration and explanation will be omitted.

Next, the timing signal generator VFO 34 will be explained. The VFO 34 inputs read data from the floppy disk drives FD1 to FD4 having bit phase changes caused by changes in disk rotation or peak shifts, and converts it into a window signal and reproduced read data that can be read by the floppy disk controller FDC33. It converts into a signal and outputs it. Furthermore, VFO34
The form can be switched to either type A or type B according to the output signal "0" or "1" of the initial set register 32, and for example, the well-known form manufactured by Suwa Seikosha Co., Ltd. Product name
A SED9420C type semiconductor LSI can be used, and its detailed configuration and explanation will be omitted.

Next, the device select register 35 will be explained. The register 35 is a register as shown in FIG. 6, which is a collection of eight D-type flip-flops D-F/F as shown in FIG. is available. Regarding each register of the select register 35, the input terminals D0 and D1 are input with the selection signals of the floppy disk devices FD1 to FD4. 10” and device FD3 is “11”
The device FD4 is selected respectively, and the corresponding output is transferred to the decoder 36. In addition, the input terminals D4 to D7 are device
A signal to rotate each motor of FD1 to FD4 is input, for example, "1" to terminal D4.
is input to the device via the decoder 36.
The motor of FD1 will be controlled to rotate. In this way, the signals corresponding to the input terminals D0, D1, D4 to D7 of the select register 35 are transferred to the decoder 36 and sent to the devices FD1 to FD4.
The signals input to the remaining input terminals D2 and D3 are used as status information for reading, writing, and writing.

Next, details of the operation according to an embodiment of the present invention will be explained with reference to a flowchart shown in FIG. Note that the host system 2 is an office computer main body, a personal computer main body, or the like.

First, a sheet used in an embodiment of the present invention will be described below. The different types of sheets are B type (96TPI,
Double-sided high-density double-track floppy sheet with a transfer rate of 500KBit/Second) and A type called sheet 1D (48TPI, transfer rate of 250KBit/Second)
Assume that there is a type A single-sided double-density floppy sheet called sheet 2D, and a double-sided double-density floppy sheet of type A called sheet 2D.

Also, as a floppy disk device, A
It is assumed that a floppy disk device (type A device) that can read and write only type sheets and a floppy disk device (type B device) that can read and write both type A and type B sheets are connected.

Now, at the request of the operator of the host system 2, the flowchart shown in FIG. 7 is started when a floppy disk control command is generated by the host system 2. When you first start, the device change judgment process is executed in step (70).
It is determined whether or not the floppy disk devices FD1 to FD4 that were last controlled by the host system 2 are the same (device change determination step).

A specific example is to provide a 4-bit device change table corresponding to each device FD1 to FD4 on the memory of the host system 2 as shown in FIG.
Host system 2 is the device to be controlled
Check the bits corresponding to FD1~4 and set them to “0”
If so, it is determined that there has been no change and the process proceeds to the next step (71).

Step (71) is a change status determination step for checking whether or not the floppy disk (recording medium) of the selected control device FD1 to FD4 has been replaced. An example of the determination method in step (71) is that when the recording medium is replaced, the INT flag "1" is transferred from the controller 30 as a status signal to the memory of the host system 2, so this flag is "0". The determination is made based on whether it is present or "1" (change status determination step).

If this flag is "1", the process advances to the next step (72). This step (72) is specified even if the judgment in step (70) is YES, and if there is a device change or if the floppy disk recording medium is replaced, the step shown in FIG. Set all drive bits of the drive changeable table shown in the figure to “1”,
Proceed to the next step (73).

In this step (73), the contents of the device identification switch 31 are loaded onto the memory by the IN command of the host system 2, and the device FD to be controlled is loaded.
1 to 4 are for determining whether the device is type A or type B. As a result, if it is type A, proceed to step (74) and FDC33 and VFO shown in Figure 3.
34 to type A, a bit "0" is set in the initial set register 32 (initialization step). Further, the bits in the device changeable table shown in FIG. 8 corresponding to the selected floppy disk devices FD1 to FD4 to be controlled at the same time as initialization are set to "0".

On the other hand, if it is the B type, the program proceeds to step (75) and similarly sets the bit "1" in the set register 32 to initialize the FDC 33 and VFO 34 shown in FIG. 3 to the B type (initialization step). At the same time, the bits in the table of FIG. 8 corresponding to devices FD1 to FD4 are set to "0".

In this way, by setting the bit in the table in Figure 8 to "0", the next device
This allows steps (72) to (75) to be omitted if the same device is selected when selecting FDs 1 to 4.

Next step (76) is NO in step (71)
In this case, or when step (74) or (75) is completed, the host system 2 sends a command to the initialized FDC 33, the command is executed in step (77), and step (78) is executed. ) performs an error check and ends (execution step).

As explained above, according to the embodiment of the present invention, two types of floppy disk devices, A and B, can be controlled by a common controller, and changes between different types can be performed by changing the device type.
Since this is performed when FDs 1 to 4 are changed or the recording medium is replaced, the influence on the access time of the floppy disk device can be reduced.

Next, another embodiment of the present invention is shown in FIG. 9 and will be described. In FIG. 9, the same reference numerals as in FIG. 3 indicate the same or equivalent parts, and the difference from the above-described embodiment is that a floppy disk (recording medium) used instead of the device identification switch SW31 is used. data is recorded in advance (identification information retention step),
By reading this data, a similar operation can be performed.

That is, in another embodiment of the present invention, identification information is held in a part of the recording medium, and as a specific example, on the top surface of both type A and type B sheets.
Sheet-specific data is written to SIDE0 and track TRACK0.

The host system 2 loads the data, identifies the sheets, and puts them in the appropriate state.
By initializing FDC33 and VFO34, it is possible to read and write both types of sheets.

Also, the data written to SIDE0 and TRACK0 is
This takes advantage of the fact that if the transfer rate for both sheets is 250 KBit/second and the FDCs 33 and 34 are initialized for A type sheet control, the sheet can be determined without changing the initials.

Here, the data recording state of the sheet used in another embodiment of the present invention will be described below. The different types of sheets are the B type (96TPI, transfer rate 500KBit/Second) double-sided high density double track floppy sheet called Sheet 2QD, and the A type (48TPI, transfer rate 500KBit/Second) called Sheet 1D.
There are single-sided double-density floppy sheets (250KBit/second) and A-type double-sided double-density floppy sheets called Sheet 2D.

Sheet 2QD has a data format as shown in FIG. 10, where SIDE0 indicates the front side of the floppy sheet and SIDE1 indicates the back side of the sheet. BOOT is an abbreviation for Boot Strap, which contains a program that loads an operating system into memory from a floppy disk. F8FFFF is identification data that characterizes another embodiment of this invention, and is sheet 2
This indicates QD. The reserve (15 sectors) is a blank area, and TRACK 0, which consists of BOOT, F8FFFF, and reserve, is recorded only in this area in A type, and the other recording areas are 2
It was recorded in type B for QD sheets. Note that FAT is an abbreviation for FILE TABLE, and is used by the operating system to manage files in units of sectors, and the record length of the file can be determined from this information. D.I.R.
It is an abbreviation for DIRECTORY and corresponds to the file registry recorded on that sheet.

Further, the sheet 1D has the data format as shown in FIG. 11A, all recording areas are recorded in the A type, and the identification data FEFFFF
It is similar to FIG. 10, except that is stored after the BOOT area. Furthermore, sheet 2D
is a data format as shown in FIG. 11B, and
Like sheet 1D, it is recorded in type A, and identification data FFFFFF is recorded after the BOOT area. Thus, the sheets used in other embodiments of this invention are sheet 2
It has the same configuration as the conventional sheet, except that the areas specified by SIDE0 and TRACK0 of the QD are recorded in a common A type, and the identification data shown below is provided on each sheet, so detailed explanations are omitted. do.

A type sheet 1D...FEFFFF Sheet 2D...FFFFFF B type sheet 2QD...F8FFFF Note that the codes of each of the above identification data are not limited to these.

Next, FIG. 12 shows the operation of another embodiment of the present invention.
This will be explained using the flowchart shown in FIG. First, when the system is powered on, initial settings are performed according to the flowchart shown in FIG. That is, in step (90), the initial set register 3 of FIG.
Bit “0” is transferred from host system 2 to step 2, and steps (91) and (92) are transferred to VFO 34 and FDC 33.
is initialized by the output bit "0" of the register 32, and the initial setting for A type control is completed.

Next, the operation in normal use will be explained with reference to FIG. 13. In this example as well, it is assumed that the B type device can read and write both the A type sheet and the B type sheet.

First, when the floppy sheet is replaced, the floppy disk devices FD1 to FD4 shown in FIG. 9 temporarily enter the NOT READY state, so the FDC 33 senses this state change using this state signal. The host system 2 receives this and sets the INT flag "1" in the memory as in the previous embodiment. Using this INT flag, host system 2 sets this flag to “1” in step (93).
If it is "1", it is determined that at least the sheet has been replaced, and the process proceeds to step (94). On the other hand, if it is "0", it is determined that it is the same type as last time (A or B), so the seventh
Steps (76) (77) as shown in the flowchart
and exit.

Step (94) is floppy sheet 2QD, 1
Since the identification codes of D and 2D are recorded in the common A type, the above-mentioned steps (90) and (91)
By steps similar to (92), FDC3 in Fig. 9 is
3. Initialize FO34 for A type sheet. Next, the process proceeds to step (95) in which it is determined what type of seat the replaced one is. In step (95), SIDE0 of the replaced sheet (1D, 2D, or 2QD)
If it is TRACK 0 and the identification data of SECTOR 2 is read and written, and if it is FEFFFF or FFFFFF, it is determined that it is type A, and the process proceeds to steps (76) and (77) and ends. On the other hand, if it is F8FFFF, it is determined to be type B and the process proceeds to step (96). In step (97), in order to set the FDC 33 and VFO 34 in FIG. 9 to type B, the host system 2 transfers bit "1" to the initial set register 32 in FIG. is set (initialization process).

The operation is then completed through steps (76) and (77) (execution step).

As explained above, the device controller 90
can be made common, and further A type or B type
Type determination is floppy device FD1~
Since this is automatically performed when the sheet No. 4 is replaced, the influence on the access time of devices FD1 to FD4 can be reduced.

In addition, in the above two embodiments, the case where the FDC 33 and VFO 34 are initialized is described as an example of the initialization means, but the initialization mentioned here refers not only to the case where hardware circuits such as the FDC 33 and VFO 34 are initialized;
Both hardware and software, or
It may be initialization of only software. Further, the term "initialization" as used herein refers to resetting the recording medium read/write control means by changing the mode or changing the parameters so that the recording medium can be read and written correctly.

In addition, in the above embodiment, identification information is stored in a switch or recorded in a recording medium, but other information such as memory, RAM, ROM, hardware logic, constants in a program, etc. It may also be a holding means. Further, the identification information may be held at any location within the system.

Further, in the above two embodiments, the recording medium read/write control means is a floppy disk controller, but it does not need to exist separately from the host system as in the embodiments, but is a part of the host system. You can also straddle it. Alternatively, it may be built into the host system.

[Effects of the Invention] As described above, according to the present invention, recording media recorded with different types can be efficiently and correctly controlled by using a common recording medium read/write control means.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing the connection status of a general host system, floppy disk controller, and floppy disk device. Figure 2 is a conventional floppy disk controller with 48TPI.
FIG. 3 is a block diagram showing a recording medium read/write control method according to an embodiment of the present invention, and FIG. 5 is a detailed diagram of the initial set register 32 in FIG. 3, FIG. 6 is a detailed diagram of the device select register 35 in FIG. 3, and FIG. 7 is a detailed diagram of the device select register 35 in FIG. A flowchart diagram explaining the operation of what is shown in the figure,
FIG. 8 is a diagram showing a table provided on the memory of the host system, FIG. 9 is a block diagram showing a recording medium read/write control method showing another embodiment of the present invention, and FIGS. 10 and 11 are flowcharts. FIGS. 12 and 13 are flowcharts illustrating the operation of the data format shown in FIG. 9. In the figure, 1 is a floppy disk controller, 2 is a host system, 3 is a floppy disk device, 31 is a device identification switch, and 32 is a floppy disk controller.
3 is an initial set register, 33 is a floppy disk controller FDC, and 34 is a timing signal generator VFO as a signal generator. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A method for recording media of different recording types by using a recording medium control means that controls reading and writing operations on the recording medium and a recording medium reading and writing device that reads and writes from the recording medium, which has the following steps. , a recording medium read/write control method for reading and writing data. (a) an identification information retention step for retaining identification information for identifying the recording type of the recording medium; (b) sensing and storing whether the recording medium in the recording medium reading/writing device may have been replaced; Replacement sensing step, (c) determining whether there is a possibility that the recording medium in the recording medium reading/writing device has been replaced since a previous read/write operation for the recording medium reading/writing device, based on the memorization result of the replacement sensing step; (d) If it is determined in the change status determination step that there is a possibility that the recording medium has been replaced, the identification information held in the identification information retention step is used to update the record in the recording medium read/write device. an initializing step of initializing the recording medium control means so that the medium can be read and written; (e) executing a data read/write operation on the recording medium in the recording medium read/write device using the recording medium control means initialized in the initialization step; Process. 2 It has the following steps, and uses a recording medium control means that controls read/write operations on the recording medium and one or more recording medium read/write devices that read and write the recording medium, to write data to recording media of different recording types. A recording medium read/write control method for reading and writing. (a) An identification information holding step that holds identification information for identifying the recording type of the recording medium; (b) If there are two or more recording medium reading/writing devices, the recording medium reading/writing device that will read/write from now on,
(c) A device change detection step of determining whether the recording medium in the recording medium reading/writing device is the same as the one that read/write data immediately before, and (c) a replacement sensing step of sensing and storing whether the recording medium in the recording medium reading/writing device may have been replaced. (d) change status determination for determining whether there is a possibility that the recording medium in the recording medium read/write device has been replaced since the last read/write operation for the recording medium read/write device, based on the memorized result of the replacement sensing step; (e) If the device change determination step determines that the recording medium read/write device is different, or if the change status determination step determines that the recording medium may have been replaced, the identification information retention step an initialization step of initializing a recording medium control means so that the recording medium in the recording medium reading/writing device can be read and written using the held identification information; (f) recording using the recording medium control means initialized in the initialization step; an execution step of performing data read/write operations on a recording medium in a media read/write device;