KR20100027441A - Data back up method and solid state drive including energy storages - Google Patents

Abstract

The present invention relates to a solid state drive (SSD) equipped with a power storage device, and more particularly, even when a power input from a host computer becomes unstable or the supply of power is interrupted. The present invention relates to an SSD capable of stably backing up data in internal volatile memory to nonvolatile memory.

To this end, the present invention is arranged in a memory bus slot connected to the internal bus to the control unit consisting of a flash controller, a central processing unit (CPU) and a volatile memory connected to a host computer and an external bus, An SSD including a nonvolatile memory connected to the SSD includes a power storage device provided at an output voltage terminal of an input power supply of the SSD.

Description

SDS equipped with power storage device and data preservation method using SSD {DATA BACK UP METHOD AND SOLID STATE DRIVE INCLUDING ENERGY STORAGES}

The present invention relates to a solid state drive (SSD) equipped with a power storage device, and more particularly, even when a power input from a host computer becomes unstable or the supply of power is interrupted. The present invention relates to an SSD capable of stably backing up data in internal volatile memory to nonvolatile memory.

In general, a device for recording and playing multimedia, such as a computer, requires a device for storing a large amount of data, and a hard disk is widely used as a mass storage device, but recently, portability considering a small computer or a mobile device In order to secure a solid state drive, a solid state drive (hereinafter referred to as an SSD), which is a flash-based mass storage device, has been developed and commercialized.

There is a stacking (Stacking) technology to make a large-capacity SSD, but there is a problem that causes a malfunction due to a lot of heat generated a long time operation.

In order to solve the above problems, a large-capacity SSD has been introduced that is equipped with a flash controller including a conventional SSD controller to use a plurality of flash memory as a single flash memory.

The patent application No. 10-2008-0022645 filed by the present applicant (a virtual memory module using a flash memory and a solid state drive using the same) and a write characteristic are classified according to workload characteristics to provide a write processing technique suitable for the pattern. Selected Patent Application No. 10-2008-0023539 (Flash Memory System), Patent Application No. 10-2008-0023540 (Hybrid Storage Device) using a combination of flash memory and nonvolatile memory and another existing SSD The mass storage device receives data from the host and stores the data in volatile memory through the CPU, and then stores the data in nonvolatile memory. When the power supplied from the host is abnormally interrupted, the data is transferred to the nonvolatile memory. Lost data on volatile memory before it is written There is a problem that can not recover.

The present invention provides a memory bus connected to an internal bus to a control unit comprising a flash controller connected to a host computer and an external bus, a central processing unit (hereinafter referred to as a CPU), and a volatile memory. An SSD including a nonvolatile memory arrayed and connected to a slot includes a power storage device at an output voltage terminal of an input power supply of the SSD, so that the SSD may be interrupted or an abnormal voltage drop may occur in the SSD. It is an object of the present invention to provide an SSD capable of flushing, in which data on volatile memory is stably written to nonvolatile memory.

Another object of the present invention, since the power storage device comprises a direct current DC (DCDC) transformer, an object thereof is to provide an SSD so that the power input from the host computer is a suitable operating power for the SSD.

Still another object of the present invention is that the power storage unit further includes an energy storage for storing the power that has passed through the DCDC transformer and outputting the SSD to the SSD, so that the input power is interrupted or an abnormal voltage drop occurs. It is an object of the present invention to provide an SSD in which power required for flushing operations in which data on volatile memory in the SSD is stably written to nonvolatile memory is maintained.

Another object of the present invention, the voltage detector located between the host computer and the DCDC transformer senses the input voltage, when the voltage drops below the reference voltage of the input power source generates a constant operation signal, the operation signal is an external bus The purpose of the present invention is to provide an SSD which is transmitted to a data bus switch located inside of the system to physically block the external bus to prevent inflow of additional data, thereby preventing an error caused by inflow of additional data during the flushing operation. .

The present invention relates to an SSD comprising: a flash controller connected to an external bus of a host computer; and a nonvolatile memory arrayed and connected to a memory bus slot connected to an internal bus to a control unit comprising a CPU and volatile memory. It characterized in that it comprises a power storage device provided in the output voltage terminal of the input power supply unit of the SSD.

In another aspect of the present invention, the power storage device is configured such that the power input from the host computer is an appropriate operating power supply to the SSD, and includes a DCDC transformer in which a DC current is input and output as a DC current.

Still another invention of the present invention, the power storage device further comprises an energy storage for storing the power through the DCDC transformer while inputting to the SSD at the same time.

Still another invention of the present invention includes a voltage detector positioned between the host computer and the DCDC transformer for sensing an input voltage and generating a constant operation signal when the input power drops below a reference voltage.

Another invention of the present invention, which is located inside the external bus, is connected to the voltage detector, and receives the operation signal generated from the voltage detector to physically prevent the additional data flowing into the SSD through the external bus. It is configured to include a data bus switch to shut off.

Another invention of the present invention is a data preservation method of an SSD provided with the power storage device, and maintains an appropriate voltage so that the operation of the SSD is prevented by mounting the power storage device in the SSD when an abnormal voltage drop or power input is interrupted. In the data preservation method of the SSD, the voltage detector detects an interruption or abnormal voltage drop of power input from the host computer, and transmits an operation signal to the data bus switch. The data bus switch receives the physical bus to physically block the external bus to prevent inflow of additional data through the external bus, and emergency power stored in the energy storage is supplied to the SSD to complete the flushing operation. Data preservation method of SSD equipped with a power storage device The.

Another invention of the present invention, the SSD is provided with a power storage device, characterized in that the data bus switch to block the external bus to prevent the inflow of additional data, thereby preventing an error from occurring during the flush operation. Data retention method.

In still another aspect of the present invention, the flushing operation may be performed under the control of the flash controller using the emergency power supplied from the energy storage to complete backup of data on the volatile memory to the nonvolatile memory. A data storage method of an SSD provided with a power storage device.

Effects according to the present invention are as follows.

First, an SSD comprising a flash controller connected to a host computer and an external bus and a nonvolatile memory arrayed and connected to a memory bus slot connected to an internal bus to a controller consisting of a CPU and volatile memory, the SSD being supplied to the SSD It is configured to include a power storage device provided at the output voltage terminal of the input power supply unit, the effect of providing an SSD with a power storage device capable of stably preserving data on the non-volatile memory in the SSD without a separate external power supply device There is.

Second, the power storage device ensures that the power input from the host computer is an appropriate operating power supply to the SSD, and is provided with a DCDC transformer for inputting DC current and outputting the DC current, even if the voltage of the power input from the host computer is different. There is also an effect of providing an SSD having a power storage device is converted into an input power suitable for the operation of the stable operation state of the SSD.

In addition, the power storage device further includes an energy storage that stores power through a DCDC transformer and simultaneously inputs the SSD to the volatility in the SSD even when the power supplied from the host computer is interrupted or an abnormal voltage drop occurs. There is also an effect of providing an SSD equipped with a power storage device capable of flushing to stably write data on the memory to nonvolatile memory.

Fourth, it is located between the host computer and the DCDC transformer to detect the input voltage, and is located inside the voltage detector and external bus that generate a constant operating signal when the voltage drops below the reference voltage of the input power. It is also effective to provide an SSD having a power storage device having a data bus switch and immediately sensing abnormal voltage drop of an input voltage supplied from a host computer.

Fifth, the data bus switch receives an operation signal generated from the voltage detector and physically blocks additional data from flowing into the SSD through an external bus, thereby preventing an error that may occur during a flush operation. There is also the effect of providing.

Hereinafter, an SSD equipped with a power storage device according to the first and second embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing the configuration of the SSD, Figure 2 is a block diagram showing the configuration of the SSD with a power storage device according to a first embodiment of the present invention, Figure 3 is a preferred embodiment of the present invention 2 is a block diagram illustrating a configuration of an SSD equipped with a power storage device according to an embodiment.

1 to 2, a brief description of the SSD 200 provided with the power storage device 300 according to the first embodiment of the present invention, the host computer 100 is connected to an external bus In the SSD 200 including a non-volatile memory arrayed and connected to the memory bus slot 220 is connected to the control unit 210 consisting of a flash controller and a CPU and volatile memory by an internal bus, the SSD 200 The power storage device 300 is provided at the output voltage terminal of the input power supply unit.

Although the power storage device 300 may be located outside the SSD 200, the power storage device 300 may be embedded in the SSD 200 for the convenience of the user and the appearance of the SSD 200.

The power storage device 300 includes a DCDC transformer 310 and an energy storage 320. The DCDC transformer 310 has a voltage of a power output when the host computer 100 is operating normally. Depending on the host computer 100, the SSD 200 may be supplied with an appropriate operating power, and the power passed through the DCDC transformer 310 may be input to the SSD 200 via the energy storage 320. The DCDC transformer 310 stores power through the SSD 200 and stores emergency power.

The power supplied from the host computer 100 is 3.3V to 12V, although a 3.3V, 5V, or 12V power source may be used, but in the present invention, it is preferable to use 5V or more.

The energy storage 320 may use a large-capacity battery capable of operating for a long time without power input from the host computer 100. However, when the large-capacity battery is used, the energy storage 320 becomes bulky, and the SSD 200 generates heat due to the heat generation of the battery. An error may occur during the operation of the N), and therefore, a battery capable of supplying the minimum power required to complete the flushing operation of stably recording data on the volatile memory in the SSD 200 to the nonvolatile memory through the internal bus is preferable. .

The volatile memory may use static random access memory (SRAM) or various types of dynamic random access memory (DRAM), in which data disappears when a power supply is interrupted. However, in the present invention, a synchronous memory uses a synchronous dynamic random access memory (SDRAM). It is preferable.

The nonvolatile memory preferably uses a NAND flash memory 230 having a small size, a high volume, and a high degree of integration.

Hereinafter, a second embodiment of an SSD 200 equipped with a preferred power storage device 300 according to the present invention will be briefly described with reference to FIG. 3.

Referring to FIG. 3, a second embodiment of the SSD 200 including the power storage device 300 including the first embodiment of the present invention will be briefly described. The host computer 100 is connected to an external bus. In the SSD 200 including a non-volatile memory arrayed and connected to the memory bus slot 220 is connected to the control unit 210 consisting of a flash controller and a CPU and volatile memory by an internal bus, the SSD 200 The power storage device 300 is provided at an output voltage terminal of an input power supply unit of a power supply unit), and a voltage detector 400 is located between the host computer 100 and the DCDC transformer 310. The voltage detector 400 is connected to the data bus switch 500 located inside the external bus.

The voltage detector 400 senses the voltage of the power output from the host computer 100, and operates when the voltage of the power input to the DCDC transformer 310 falls below a reference voltage or stops supplying power. Will generate a signal.

The reference voltage is set to a voltage output from the host computer 100 according to the user environment, it is possible to set a standard voltage other than 3.3V, 5V, 12V and the like commonly used, but preferably set to 5V in the present invention Do.

The operation signal generated by the voltage detector is transmitted to the data bus switch 500 located inside the external bus. When the data bus switch 500 receives the operation signal, the external bus is physically cut off to block the external bus. The inflow of data through is blocked and prevents an error that may occur due to data introduced from the outside during the flushing operation.

The time required for the flushing operation to be completed is 2 to 3 seconds, and the emergency power output from the energy storage 320 is preferably maintained for 2 seconds or more so that the flushing operation may be completed.

2 to 3, when the SSD 200 including the power storage device including the first and second embodiments according to the present invention has an abnormal voltage drop or a power input is interrupted, the volatility in the SSD 200 may be reduced. A method of preserving data in the memory as a nonvolatile memory will be briefly described. A power storage device 300 is provided at an output voltage terminal of an input power supply unit of the SSD 200 so that a normal voltage from the host computer 100 can be maintained. When power is input, emergency power is stored.

In the method of storing the emergency power, the power output when the host computer 100 is operating normally is converted to a power of a voltage suitable for the SSD 200 to operate while passing through the DCDC transformer 310, The converted power is input to the SSD 200 via the energy storage 320. At this time, the converted power is input to the SSD 200 while being stored in the energy storage 320.

The converted power is irrelevant as long as the SSD 200 is the minimum power that can be operated. However, in the present invention, the power stored in the energy storage 320 and the output power are 5V so that the operation of the SSD 200 is unreasonable. Is preferred.

The energy storage 320 preferably stores 5 V as an input power at the same time and outputs 5 V power to smoothly store or read the SSD 200.

The power is turned off or artificially turned off while the host computer 100 is in use, or the host computer 100 is in normal operation, but an abnormal voltage drop occurs due to an abnormal power output of the host computer 100. When the SSD 200 becomes inoperable, emergency power stored in the energy storage 320 is input to the SSD 200, and the data is safely stored in the SSD 200 using the emergency power to perform a flush operation. It is finished.

The flush operation refers to a series of processes until data on the volatile memory in the SSD 200 is stably written to the nonvolatile memory under the control of the flash controller of the controller 210.

 When the host computer 100 is in use, power failure or artificial power is turned off, or the host computer 100 is in normal operation, but an abnormal voltage drop occurs due to an abnormal power output of the host computer 100. The emergency power of the energy storage 320 is output to the SSD 200 and the voltage detector 400, which is connected between the host computer 100 and the DCDC transformer 310, is supplied from the host computer 100. It detects that the reference voltage is less than or equal to generate an operation signal.

The reference voltage may be used in the range of 3.3V to 12V depending on the host computer 100 used by the user. However, the reference voltage is preferably 5V which is most commonly used in the present invention.

The operation signal is transmitted to the data bus switch 500 located inside the external bus, and the data bus switch 500 blocks the external bus. By blocking the external bus, the host computer 100 In order to prevent additional data from flowing through the external bus at the to prevent errors that may occur during the flushing operation.

Therefore, the SSD 200 including the power storage device 300 according to the first and second embodiments of the present invention includes a flash controller connected to a host computer 100 and an external bus, a CPU, and a volatile memory. In the SSD 200 including a nonvolatile memory arrayed in the memory bus slot 220 connected to the control unit 210 by an internal bus, power is supplied to the output voltage terminal of the input power supply unit of the SSD 200. When a power storage device 300 is provided and the power supplied to the SSD 200 is interrupted or a voltage drop occurs, a flush operation for storing data by storing data on the volatile memory in the SSD 200 into the nonvolatile memory is performed. It is possible.

In addition, the voltage detector 400 and the data bus switch 500 are further included to block the inflow of additional data during the flushing operation, thereby preventing an error from occurring during the flushing operation, thereby stably storing data on the volatile memory. To preserve.

The present invention is not limited to the specific preferred embodiments described above, and the technology to which the invention belongs without departing from the spirit of the invention claimed in the technical field to which the invention belongs without departing from the spirit of the invention as claimed in the claims. Various modifications can be made by those skilled in the art, and such modifications are within the scope of the claims.

1 is a block diagram showing a configuration of an SSD.

2 is a block diagram showing the configuration of an SSD equipped with a power storage device according to a first embodiment of the present invention.

3 is a block diagram showing the configuration of an SSD equipped with a power storage device according to a second embodiment of the present invention.

<Description of Major Symbols in Drawing>

100: host computer

200: Solid State Drive

210: control unit 220: memory bus slot

230: NAND flash memory

300: power storage device

310: DC DC transformer 320: energy storage

400: voltage detector

500: data bus switch

Claims (8)

A SSD comprising a flash controller connected to a host computer and an external bus and a nonvolatile memory arrayed and connected to a memory bus slot connected to an internal bus to a control unit consisting of a CPU and volatile memory. And a power storage device provided at an output voltage terminal of the input power supply unit of the SSD. The method of claim 1, The power storage device, A DCDC transformer configured to supply power input from the host computer to an appropriate operating power supply to the SSD, wherein a DC current is input and output as a DC current; And And a power storage device comprising: an energy storage for storing power through the DCDC transformer and inputting the same to the SSD at the same time. The method according to claim 1 or 2, A voltage detector positioned between the host computer and the DCDC transformer to sense an input voltage and generating a constant operation signal when the voltage drops below the reference voltage of the input power source; And Located inside the external bus, the SSD with a power storage device characterized in that it comprises a data bus switch connected to the voltage detector. The method of claim 3, wherein And the data bus switch receives an operation signal generated from a voltage detector and physically blocks additional data from flowing into the SSD through the external bus.  In case of abnormal voltage drop or interruption of power input, the power storage device of claim 3 is mounted in the SSD to maintain an appropriate voltage so as not to interfere with the operation of the SSD. The method of claim 5, wherein The data storage method of the SSD, The voltage detector detects an interruption or abnormal voltage drop of power input from the host computer to transmit an operation signal to the data bus switch, and the data bus switch receiving the operation signal physically blocks the external bus. Preventing the inflow of additional data through the external bus and supplying the emergency power stored in the energy storage to the SSD to complete the flushing operation. The method according to claim 5 or 6, The flush operation, Under the control of the flash controller by using the emergency power supplied from the energy storage data preservation method of the SSD with a power storage device characterized in that to complete the backup of the data on the volatile memory to non-volatile memory first . The method of claim 7, wherein The data preservation method of the SSD with a power storage device, characterized in that the time that the emergency power input to the SSD is maintained for 2 seconds or more.

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