JP4155842B2 - Data transfer apparatus and memory replacement method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a data transfer device that executes writing of designated data in a nonvolatile storage medium or reading of designated data from a nonvolatile storage medium based on a command of the host device, and transfers the read data to the host device In particular, when the data storage area (system use area) of the nonvolatile storage medium is defective, the data is compensated by storing the data in the spare storage area (memory replacement area) of the nonvolatile storage medium. The present invention relates to a transfer device.
[0002]
[Prior art]
Conventionally related technology, as disclosed in "Patent Document 1" (alternate sector management method), when accessing from a host system by a logical address, a defective sector due to a defect or the like is not involved in the host system by a replacement process. The one that aims at that is known.
[0003]
Such a replacement sector management method can perform a sector replacement process at high speed even if a defect occurs in a sector after initialization using a replacement management table to which a tuple instruction offset is added.
[0004]
In addition, the conventional replacement sector management method compensates for the replacement of the storage medium itself by describing the offset management table and the replacement management table in the storage medium, and stores the table in the control unit that performs the conversion process from the logical address to the physical address. Does not require memory to deploy.
[0005]
In general, the storage medium has a large capacity and a high density, making it difficult to avoid initial defects in the sector. In addition, there are cases where new sector defects occur due to secular changes, etc. The accompanying data area replacement management is indispensable.
[0006]
The basics of such replacement management are performed by rewriting the management table.
[0007]
[Patent Document 1]
JP-A-7-36789
[0008]
[Problems to be solved by the invention]
“Patent Document 1” (alternative sector management method) can rewrite the management table at a high speed, but it takes time to rewrite the management table, and if the management table rewrite occurs frequently, the problem affects the operation of the host system. There is.
[0009]
The present invention has been made to solve such a problem. The object of the present invention is not to affect the operation time of the host device, the data area where the defect has occurred can be replaced, and the stored data can be backed up. An object of the present invention is to provide a highly reliable and convenient data transfer apparatus.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, a data transfer device according to the present invention executes writing of data specified in a nonvolatile storage medium or reading of data specified from a nonvolatile storage medium based on a command from a host device. A data transfer device that transfers the read data to the host device, and sequentially reads the data from the system use area of the nonvolatile storage medium during the operation stop time of the command processing interval from the host device, and the read data is again If the data written to the system use area is abnormal, the address of the read data is changed, the data is written to the memory replacement area of the nonvolatile storage medium, and the data written to the nonvolatile storage medium Compensation means to write the same data as backup data to other nonvolatile storage media Characterized in that was.
[0011]
The data transfer device according to the present invention sequentially reads data from the system use area of the nonvolatile storage medium during the operation stop time period of the command processing interval from the host device, and writes the read data to the system use area again and writes it. If the read data is abnormal, the address of the read data is changed and the data is written to the memory replacement area of the non-volatile storage medium, and the same data as the data written to the non-volatile storage medium is written to another non-volatile storage medium. Since data compensation means for writing back-up data to the volatile storage medium is provided, even if a defect occurs in the system use area of the non-volatile storage medium, the data is stored in the memory replacement area during the operation stop time, and the non-volatile storage medium Can be backed up to other non-volatile storage media. , Without affecting the operation of the host device, it is possible to enhance the convenience to enhance the reliability of the stored data.
[0012]
The data compensation means according to the present invention includes a memory replacement means for writing data to a memory replacement area of a nonvolatile storage medium, a memory backup means for writing backup data to another nonvolatile storage medium, and a read from the nonvolatile storage medium. Data temporary storage means for temporarily storing the data, and data compensation control means for controlling the operation of memory replacement and memory backup.
[0013]
The data compensation means according to the present invention includes a memory replacement means for writing data to a memory replacement area of a nonvolatile storage medium, a memory backup means for writing backup data to another nonvolatile storage medium, and data read from the nonvolatile storage medium Data temporary storage means for temporarily storing data, and data compensation control means for controlling the operation of memory replacement and memory backup, so that if a problem occurs in the system use area of the nonvolatile storage medium, the memory replacement area Data can be written to and stored in other non-volatile storage media and backed up, improving data reliability and minimizing data rewriting and storage medium replacement operations. be able to.
[0014]
Further, the data compensation means according to the present invention comprises an operation time setting means for measuring the operation time and the operation stop time of the apparatus, statistically calculating them, and setting the operation time of memory replacement or memory backup. And
[0015]
Since the data compensation means according to the present invention includes the operation time setting means for measuring and statistically calculating the operation time and operation stop time of the apparatus and setting the operation time of memory replacement or memory backup, the operation of the apparatus The memory replacement or the memory backup can be executed without affecting the operation, and the operational stability of the apparatus can be realized.
[0016]
The data compensation means according to the present invention is characterized by comprising switching means for alternately switching between memory replacement and memory backup during the operation stop time period.
[0017]
Since the data compensation means according to the present invention includes switching means for alternately switching between memory replacement and memory backup in the operation stop time zone, the memory replacement and memory backup can be operated alternately for each operation stop time, Memory replacement and memory backup can be executed in a well-balanced manner during the operation stoppage time.
[0018]
Furthermore, the nonvolatile storage medium according to the present invention is characterized by comprising an address correspondence table area between the address of the system use area, which is the memory capacity required for the host device, and the address of the memory replacement area.
[0019]
The non-volatile storage medium according to the present invention has an address correspondence table area between the address of the system use area and the address of the memory replacement area, which is the memory capacity required for the host device, so that a defect occurs in the system use area. However, the address can be converted and the data can be stored in the memory replacement area, and the rewriting of data from the system use area to the memory replacement area can be executed smoothly during the operation stop time period.
[0020]
Further, the memory replacement method of the data transfer device according to the present invention executes writing of data designated in the nonvolatile storage medium based on a command of the host device or reading of data designated from the nonvolatile storage medium, A method of transferring the read data to a host device, the step of recognizing the operation stop time of the command processing interval (S1), the step of reading data from the system use area of the nonvolatile storage medium (S2), A step of rewriting data in the system use area (S3), a step of determining whether or not the rewritten data is normal (S4), and a data abnormality, the data is stored in the memory replacement area based on the address correspondence table. Step (S5), and reading and transferring the corresponding data from the memory replacement area (S6) Characterized by comprising and.
[0021]
A memory replacement method for a data transfer device according to the present invention is a method for transferring read data to a host device, the step of recognizing an operation stop time of a command processing interval (S1), and a system use of a nonvolatile storage medium A step of reading data from the area (S2), a step of rewriting the read data in the system use area (S3), a step of determining whether the rewritten data is normal (S4), Since it has a step (S5) of storing data in the memory replacement area based on the address correspondence table and a step (S6) of reading and transferring the corresponding data from the memory replacement area, Data can be saved in the memory replacement area instead of the system use area where the defect occurred, and Without affecting, it is possible to increase the reliability of the stored data.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a basic block configuration diagram of a data transfer apparatus according to an embodiment of the present invention. In FIG. 1, the data transfer device 1 writes data designated in the nonvolatile storage medium 7 a or stores nonvolatile data during the operation time of the host device (system) 14 based on a command from the host device (system) 14. The designated data is read from the medium 7a, and the read data is transferred to the host device 14.
[0023]
In addition, the data transfer device 1 sequentially reads data from the system use area of the nonvolatile storage medium 7a during the operation stop time period of the command processing interval from the host device 14, and writes the read data to the system use area again. If the written data is abnormal, the address of the read data is changed and the data is written to the memory replacement area of the nonvolatile storage medium 7a, and the same data as the data written to the nonvolatile storage medium 7a Is provided with data compensation means 5 for writing as a backup data to another nonvolatile storage medium 7b.
[0024]
The data compensation means 5 reads the data stored in the system use area of the nonvolatile storage medium 7a during the operation stop time of the command processing interval from the host device (system) 14, and uses the read data again for the system use. Write to the same area (same address), and determine whether the data has been stored normally.
[0025]
Further, when the rewritten data is abnormal (defect in the memory sector), the data compensation means 5 sets the address of the system use area of the nonvolatile storage medium 7a and the address of the memory replacement area (preliminary storage area). Based on the address correspondence table (stored in the spare storage area), data replacement processing is executed from the system use area to the memory replacement area (spare storage area). Such check of memory sector defects in the system use area and data replacement processing to the memory replacement area are sequentially executed.
[0026]
Further, the data compensation means 5 sequentially writes the data stored in the nonvolatile storage medium 7a to the nonvolatile storage medium 7b during the operation stop time zone of the command processing interval, and the data stored in the nonvolatile storage medium 7a is stored. Perform a backup.
[0027]
Note that the data replacement process of the nonvolatile storage medium 7a and the data backup process from the nonvolatile storage medium 7a to the nonvolatile storage medium 7b are alternately executed at each operation stop time period of the command processing interval.
[0028]
As described above, the data transfer device 1 according to the present invention sequentially reads data from the system use area of the nonvolatile storage medium 7a during the operation stop time period of the command processing interval from the host device 14, and re-reads the read data to the system. When the data written to the use area is abnormal, the address of the read data is changed, the data is written to the memory replacement area of the nonvolatile storage medium 7a, and the data is written to the nonvolatile storage medium 7a. Since the data compensation means 5 for writing the same data as the data to the other nonvolatile storage medium 7b as backup data is provided, even if a defect occurs in the system use area of the nonvolatile storage medium 7a, the memory is changed during the operation stop time. In addition to storing data in the area, other data that is the same as the data stored in the non-volatile storage medium 7a Can be backed up to the nonvolatile storage medium 7b, without affecting the operation of the host apparatus (system) 14, it is possible to enhance the convenience to enhance the reliability of the stored data.
[0029]
The data transfer device 1 includes a control unit 2, a storage unit 3, a transfer interface unit 4, a data compensation unit 5, a memory interface unit 6, and nonvolatile storage media 7a and 7b. The control unit 2, the storage unit 3, the transfer interface unit 4, the data compensation unit 5, and the memory interface unit 6 are connected to each other through an internal bus BU.
[0030]
The control means 2 is basically composed of a microprocessor and writes data designated in the nonvolatile storage medium 7a based on a command from the host device (system) 14 or reads data designated from the nonvolatile storage medium 7a. Then, control for transferring the read data to the host device (system) 14 is executed.
[0031]
The storage means 3 is composed of a memory such as a ROM or a RAM, and includes a communication protocol with the host device 14, various data such as access to the nonvolatile storage media 7a and 7b, operating conditions and sequence (operation order) of the control means 2. The operation data such as are stored.
[0032]
The transfer interface unit 4 takes a data request and request data transfer consistency (interface) between the host device 14 and the data transfer device 1 (for example, a SCSI interface), and receives a data request (command) from the host device 14. The data is supplied to the data compensating means 5 and the data supplied from the data compensating means 5 is transferred to the host device 14.
[0033]
The data compensation means 5 is composed of various arithmetic functions, processing functions, memory, etc. based on a microprocessor, and executes data replacement processing and data backup processing.
[0034]
FIG. 2 is a block diagram showing the principal part of one embodiment of the data compensating means according to the present invention. In FIG. 2, the data compensation means 5 is composed of various arithmetic functions, processing functions, buffers, etc. based on a microprocessor and software. The data compensation control means 8, the operation time setting means 9, the memory replacement means 10, and the memory backup means. 11, a switching unit 12, and a data temporary storage unit 13.
[0035]
The data compensation control means 8 measures the operation time and operation stop time of the host device (system) 14 and statistically calculates them, and sets the operation time for memory replacement or memory backup in the operation stop time zone. The setting means 9 is controlled.
[0036]
Further, the data compensation control means 8 controls the operation time setting means 9 so as to calculate the number of memory replacement or memory backup within the operation time of the operation stop time zone.
[0037]
Further, the data compensation control unit 8 controls the operation time setting unit 9 to execute the memory backup process during the current operation stop time period when the memory replacement process is executed during the previous operation stop time period. .
[0038]
Further, the data compensation control unit 8 executes control for switching to the operation mode of the memory replacement unit 10 or the memory backup unit 11 based on the setting information from the operation time setting unit 9.
[0039]
The operation time setting unit 9 includes a timer function, a calculation function, a storage unit, and the like, measures the operation time and operation stop time of the host device (system) 14 based on a command from the data compensation control unit 8, and measures the measured time The average operation start time, the average operation end time, the maximum deviation width of the operation start time, and the absolute value of the maximum deviation width of the operation end time are calculated, and the start time and stop time of the operation stop time are set from these times.
[0040]
The operation time setting means 9 sets the start time of the set operation stop time and the memory replacement count and memory backup count that can be processed within one operation stop time from the stop time.
[0041]
Furthermore, the operating time setting means 9 supplies switching information to the switching means 12 for each operation stop time, and executes switching of the memory replacement means 10 and the memory backup means 11 to the internal bus BU.
[0042]
FIG. 5 is an operation stop time setting image diagram of an embodiment of the operation time setting means according to the present invention. (A) The operation time and operation stop time of the host device (system) 14 are shown in the figure. (B) The average operation stop start time tes, the average operation stop end time tep, the operation start time maximum deviation width α, and the operation end time maximum are shown in the figure. The relationship between the shift width β and the operation stop time tEi, and FIG. 9C shows the order of the memory replacement process and the memory backup process.
[0043]
(A) In the figure, operation start times ta1, ta2 and operation end times tb1, tb2 are shown. The time interval (= tb1−ta1) between the operation end time tb1 and the operation start time ta1 represents one operation time, and the time interval (= ta2−tb1) between the operation start time ta2 and the operation end time tb1 is one operation. Represents stop time.
[0044]
(B) In the figure, the average operation start time tas represents the average value of the operation start times ta1, ta2,... Shown in (a), and the average operation end time tbp is the operation end time tb1 shown in (a). , Tb2,... Further, the operation start time maximum deviation width α represents the maximum deviation width of the operation start times ta1, ta2,..., And the operation end time maximum deviation width β represents the maximum deviation width of the operation end times tb1, tb2,.
[0045]
The operation stop start time tes is obtained by adding the operation start time maximum deviation width α to the average operation start time tas (tas + α), and the operation stop end time te is obtained by subtracting the operation end time maximum deviation width β from the average operation end time tbp. The difference (= tep-tes) between the operation stop end time te and the operation stop start time tes is set as the operation stop time tEi.
[0046]
(C) In the figure, the first operation stop time tE1 is the memory replacement process, the second operation stop time tE2 is the memory backup process, the third operation stop time tE3 is the memory replacement process, and the fourth operation stop time tE4 is The memory replacement process and the memory backup process are set alternately, such as a memory backup process.
[0047]
As described above, the data compensation means 1 according to the present invention measures and statistically calculates the operation time and operation stop time of the device (the host device 14), and sets the operation time for memory replacement or memory backup. Since the setting means 9 is provided, memory replacement or memory backup can be executed without affecting the operation of the apparatus, and the operational stability of the apparatus can be realized.
[0048]
When the system replacement area of the nonvolatile storage medium 7a is defective under the control of the data compensation control section 8, the memory replacement section 10 performs a memory replacement process for writing and storing data in the memory replacement area based on the address correspondence table. Execute.
[0049]
Under the control of the data compensation control unit 8, the memory backup unit 11 executes a memory backup process in which data stored in the non-volatile storage medium 7a is written and stored in another non-volatile storage medium 7b.
[0050]
The switching unit 12 has a switching function, and alternately connects the memory replacement unit 10 and the memory backup unit 11 to the internal bus BU for each operation stop time based on the switching information supplied from the operation time setting unit 9.
[0051]
As described above, the data compensating means 5 according to the present invention includes the switching means 12 for alternately switching between the memory replacement and the memory backup during the operation stop time period. Therefore, the memory replacement and the memory backup are alternately performed at each operation stop time. It is possible to operate, and memory replacement and memory backup can be executed in a well-balanced manner during the operation stop time period.
[0052]
The temporary data storage means 13 is composed of a buffer, and when the operation stop time zone is the system replacement mode, the nonvolatile storage medium 7a is operated during the operation stop time zone of the host device (system) 14 under the control of the data compensation control means 8. The data read from the system use area is temporarily saved, and the temporarily saved data is provided again to the same area of the nonvolatile storage medium 7a.
[0053]
In addition, when the data compensation control unit 8 determines that the nonvolatile storage medium 7a is defective by data writing again, the temporary data storage unit 13 performs the memory replacement process of the memory replacement unit 10 to change the address of the system use area. Temporarily stored data is provided to the area of the memory replacement area corresponding to (for example, address AD01) (for example, address ADC01).
[0054]
Further, the temporary data storage means 13 provides the temporarily stored data of the nonvolatile storage medium 7a to the other nonvolatile storage medium 7b by the memory backup processing of the memory backup means 11 when the operation stop time is in the memory backup mode. To do.
[0055]
Returning to FIG. 1, the memory interface means 6 reads and writes data between the nonvolatile storage media 7a and 7b and the data temporary storage means 13 under the control of the control means 2 or the data compensation control means 8 (again, The read data is temporarily stored in the data temporary storage means 13 and the temporarily stored data is supplied to the nonvolatile storage media 7a and 7b.
[0056]
The non-volatile storage media 7a and 7b are composed of a semiconductor memory such as an ATA card, and a defect occurs in a system use area for storing data supplied from the host device (system) 14 during operation time and a sector in the system use area. A memory replacement area for storing data, and an address correspondence table area for the address of the system use area and the address of the memory replacement area.
[0057]
FIG. 3 is an address correspondence table image diagram of an embodiment of a nonvolatile storage medium according to the present invention. In FIG. 3, the address correspondence table stores a system use area address (for example, AD01) and a memory replacement area address (for example, ADC01) in a one-to-one correspondence.
[0058]
As shown in FIG. 3, the address correspondence table creates a system use area address (for example, AD01) and a memory replacement area address (for example, ADC01) in advance, or when a defect occurs in the system use area. The address (for example, ADC01) of the memory replacement area corresponding to the system use area address (for example, AD01) may be created.
[0059]
FIG. 4 is an explanatory diagram of an embodiment of a memory replacement process according to the present invention. In FIG. 4, during the operation stop time period, data stored in the system use area (for example, address AD01) of the nonvolatile storage medium 7a is read and temporarily stored in the data temporary storage unit 13, and the temporarily stored data is again stored. Write in the system use area (for example, address AD01).
[0060]
At this time, if an error occurs in the data written to the system use area (for example, address AD01) again, the memory replacement process of the memory replacement means 10 refers to the address correspondence table area and corresponds to the address AD01 of the system use area. The address ADC01 in the memory replacement area is searched, and data is written and stored in the memory replacement area based on the searched address ADC01.
[0061]
As described above, the nonvolatile storage media 7a and 7b according to the present invention include the address correspondence table between the address (AD01) of the system use area and the address (ADC01) of the memory replacement area, which is the memory capacity required for the host device 14. Since there is an area, even if a defect occurs in the system use area, it is possible to convert the address and store the data in the memory replacement area, and rewrite the data from the system use area to the memory replacement area. Can run smoothly.
[0062]
The data compensation means 5 according to the present invention includes a memory replacement means 10 for writing data to the memory replacement area of the nonvolatile storage medium 7a, a memory backup means 11 for writing backup data to another nonvolatile storage medium 7b, Since data temporary storage means 13 for temporarily storing data read from the volatile storage medium 7a and data compensation control means 8 for controlling the operation of memory replacement and memory backup are provided, the system use area of the nonvolatile storage medium 7a is provided. When a failure occurs, the data can be written and saved in the memory replacement area, and the data can be saved and backed up in another non-volatile storage medium 7b to improve data reliability and rewrite data. And storage medium replacement work can be minimized.
[0063]
Next, a memory replacement method of the data transfer apparatus according to the present invention will be described. FIG. 6 is an operation flowchart of one embodiment of the memory replacement method of the data transfer apparatus according to the present invention. Refer to FIG. 1 and FIG. 2 for the operation flow.
[0064]
In FIG. 6, in step S1, the operation stop time of the command processing interval is recognized. The operation of step S1 is executed by the data compensation control means 8 and the operation time setting means 9.
[0065]
In step S2, data is read from the system use area of the nonvolatile storage medium. The operation of step S2 is executed by the data compensation control means 8.
[0066]
In step S3, the read data is written again in the system use area. The operation of step S3 is executed by the data compensation control means 8 and the data temporary storage means 13.
[0067]
In step S4, it is determined whether or not the rewritten data is normal. If the data is abnormal, the process proceeds to step S5. On the other hand, if the data is normal, step S2 and step S3 are repeated for the next data. The operation of step S4 is executed by the data compensation control means 8 and the memory replacement means 10.
[0068]
In step S5, data is stored in the memory replacement area based on the address correspondence table, and steps S2 to S4 are repeated for the next data. The operation of step S5 is executed by the data compensation control means 8, the memory replacement means 10, and the nonvolatile storage medium 7a.
[0069]
In step S6, the corresponding data is read from the memory replacement area and transferred during the operation time period. The operation of step S6 is executed by the control means 2, the transfer interface means 4, the data compensation means 5, and the memory interface means 6.
[0070]
As described above, the memory replacement method of the data transfer device according to the present invention is a method of transferring the read data to the host device, in which the operation stop time of the command processing interval is recognized, and the nonvolatile storage medium Step S2 for reading data from the system use area, step S3 for rewriting the read data in the system use area, step S4 for determining whether or not the rewritten data is normal, and if the data is abnormal, the address correspondence table is displayed. And the step S5 for storing the data in the memory replacement area and the step S6 for reading out and transferring the corresponding data from the memory replacement area. Data can be stored in the memory replacement area instead of the host device (system) Without affecting the 4 operation, it is possible to enhance the reliability of the stored data.
[0071]
【The invention's effect】
As described above, the data transfer device according to the present invention sequentially reads data from the system use area of the nonvolatile storage medium during the operation suspension time period of the command processing interval from the host device, and uses the read data again for the system use. If the data written to the area is abnormal, the address of the read data is changed, the data is written to the memory replacement area of the nonvolatile storage medium, and the same as the data written to the nonvolatile storage medium Since data compensation means for writing the data in the non-volatile storage medium as backup data is provided, even if a defect occurs in the system use area of the non-volatile storage medium, the data is stored in the memory replacement area during the operation stop time. At the same time, the same data stored in the non-volatile storage medium is backed up to another non-volatile storage medium. Can be up, without affecting the operation of the host device, it is possible to enhance the convenience to enhance the reliability of the stored data.
[0072]
The data compensation means according to the present invention includes a memory replacement means for writing data to a memory replacement area of a nonvolatile storage medium, a memory backup means for writing backup data to another nonvolatile storage medium, and a read from the nonvolatile storage medium. Data temporary storage means for temporarily storing the data and data compensation control means for controlling the operation of memory replacement and memory backup, so that if a problem occurs in the system use area of the nonvolatile storage medium, the memory Data can be written and saved in the spare area, and the data can be saved and backed up to other non-volatile storage media to improve data reliability and minimize data rewriting and storage media replacement. Can be suppressed.
[0073]
Further, since the data compensation means according to the present invention includes the operation time setting means for measuring the operation time and the operation stop time of the apparatus and statistically calculating them and setting the operation time of the memory replacement or the memory backup, The memory replacement or the memory backup can be executed without affecting the operation of the apparatus, and the operational stability of the apparatus can be realized.
[0074]
In addition, since the data compensation means according to the present invention includes the switching means for alternately switching between the memory replacement and the memory backup during the operation stop time period, it is possible to operate the memory replacement and the memory backup alternately at each operation stop time. It is possible to perform memory replacement and memory backup in a balanced manner during the operation stoppage time.
[0075]
Further, since the nonvolatile storage medium according to the present invention has an address correspondence table area between the address of the system use area and the address of the memory replacement area, which is the memory capacity required for the host device, the system use area has a defect. Even if it occurs, the address can be converted and the data can be stored in the memory replacement area, and the rewriting of data from the system use area to the memory replacement area can be executed smoothly during the operation stop time zone.
[0076]
The memory replacement method of the data transfer device according to the present invention is a method of transferring read data to a host device, the step (S1) of recognizing an operation stop time of a command processing interval, and a nonvolatile storage medium A step of reading data from the system use area (S2), a step of rewriting the read data in the system use area (S3), a step of determining whether the rewritten data is normal (S4), and a data error In this case, since there is a step (S5) of storing data in the memory replacement area based on the address correspondence table and a step (S6) of reading and transferring the corresponding data from the memory replacement area, In addition, the data can be stored in the memory replacement area instead of the system use area where the defect occurred. Without affecting the operation of, it is possible to enhance the reliability of the stored data.
[Brief description of the drawings]
FIG. 1 is a basic block configuration diagram of an embodiment of a data transfer apparatus according to the present invention;
FIG. 2 is a block diagram of a main part of an embodiment of data compensation means according to the present invention.
FIG. 3 is a diagram showing an address correspondence table according to an embodiment of a nonvolatile storage medium according to the present invention;
FIG. 4 is an explanatory diagram of an embodiment of a memory replacement process according to the present invention.
FIG. 5 is an operation stop time setting image diagram of an embodiment of the operation time setting means according to the present invention;
FIG. 6 is an operation flowchart of one embodiment of a memory replacement method for a data transfer apparatus according to the present invention;
[Explanation of symbols]
1 Data transfer device
2 Control means
3 storage means
4 Transfer interface means
5 Data compensation means
6 Memory interface means
7a, 7b Nonvolatile storage medium
8 Data compensation control means
9 Operation time setting means
10 Memory replacement means
11 Memory backup means
12 Switching means
13 Data temporary storage means
14 Host device (system)
BU internal bus

Claims (6)

A data transfer device that executes writing of data designated in a nonvolatile storage medium based on a command from a host device or reading of data designated from a nonvolatile storage medium, and transfers the read data to the host device. And
During the operation suspension time period of the command processing interval from the host device, data is sequentially read from the system use area of the nonvolatile storage medium, the read data is written again to the system use area, and the written data is abnormal. In this case, the address of the read data is changed and the data is written to the memory replacement area of the nonvolatile storage medium, and the same data as the data written to the nonvolatile storage medium is written to another nonvolatile storage medium. A data transfer apparatus comprising data compensation means for writing as backup data. The data compensation means includes a memory replacement means for writing data to a memory replacement area of the nonvolatile storage medium, a memory backup means for writing backup data to another nonvolatile storage medium, and data read from the nonvolatile storage medium. 2. The data transfer apparatus according to claim 1, further comprising: temporary data storage means for temporarily storing data, and data compensation control means for controlling operations of memory replacement and memory backup. 2. The data compensation means includes an operation time setting means for measuring an operation time and an operation stop time of the apparatus and statistically calculating them to set an operation time for memory replacement or memory backup. The data transfer device described. 2. The data transfer apparatus according to claim 1, wherein the data compensation means comprises switching means for alternately switching between memory replacement and memory backup during an operation stop time period. 2. The data according to claim 1, wherein the nonvolatile storage medium includes an address correspondence table area between an address of a system use area which is a memory capacity required for the host device and an address of the memory replacement area. Transfer device. A memory of a data transfer device that executes writing of data designated in a nonvolatile storage medium based on a command from the host device or reading of data designated from the nonvolatile storage medium and transferring the read data to the host device A replacement method,
Recognizing the operation stop time of the command processing interval (S1);
Reading data from the system use area of the non-volatile storage medium (S2);
Rewriting the read data in the system use area (S3);
Determining whether the rewritten data is normal (S4);
In the case of data abnormality, a step (S5) of storing data in the memory replacement area based on the address correspondence table;
A step (S6) of reading and transferring the corresponding data from the memory replacement area;
A memory replacement method for a data transfer apparatus, comprising:

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