KR20200143922A - Memory card and method for processing data using the card - Google Patents

Abstract

Provided are a memory card and a data processing method using the same. The memory card connected to a system bus of a host device comprises: a memory module; an address determination unit configured to determine that a memory address included in a memory access request transmitted from a protocol engine is located in which physical space; a memory access unit configured to perform a read/write operation according to the memory access request with respect to the memory module when it is determined that the memory address corresponds to the memory module; and a host access unit configured to perform a read/write operation according to the memory access request for the local memory or the storage when it is determined that the memory address corresponds to the local memory or storage of the host device.

Description

Memory card and method for processing data using the card

The present invention relates to memory expansion, and more particularly, to a memory card and a data processing method using the same.

Recently, application software that requires a hardware environment that completely transcends the existing computing environment such as machine learning, deep learning, in-memory computing, and large-scale global environment simulator has been developed at a rapid pace. And are being used. The above-described computing application software is developing in the direction of maximizing the operation speed by minimizing input/output from the hard disk using local and shared memory connected to a central processing unit (CPU). Since the maximum capacity of the local memory, which is directly connected to the CPU and has the fastest data access speed, is already determined when designing the computing board, it is impossible to increase the memory capacity beyond the maximum capacity. Therefore, when the local memory of an arbitrary node is insufficient, the memory of a remote computer node is shared using network technology, and a shared memory technology that can be used as its own memory is also rapidly developing. However, in the case of a technology using a shared memory using a network, there is a limitation that cannot but have a connection speed dependent on the network delay time.

As part of the development of the current memory use technology, the Gen-Z protocol technology, a technology that enables large-capacity memory to be shared with the computing node itself or between nodes, has been proposed. The Gen-Z protocol is a representative protocol that tries to secure a large amount of memory by creating a memory pool and to connect this memory pool by expanding the bus of the server system. Currently, the system using the Gen-Z protocol is still developing, and a product that connects to the Gen-Z bus by adding a protocol processing device to a small memory module has been developed, but has not been commercialized yet.

However, when such a device is directly mounted on a computing server or externally mounted, a separate chassis must be manufactured, and when multiple devices are to be connected to the server, a protocol switch or the like must be used.

As a related prior document, there is a "memory expansion card" described in Korean Application Publication No. 2017-0074718.

The problem to be solved by the present invention is to provide a method for processing data by easily connecting a device for a large-capacity memory pool to a computing server to expand a memory to process data, and a memory card.

A device according to an embodiment of the present invention is a memory card connected to a system bus of a host device, comprising: a memory module; A protocol engine configured to receive a memory access request and transmit data according to the memory access request; A first address determination unit configured to determine in which physical space a memory address included in a memory access request transmitted from the protocol engine is located; A memory access unit configured to perform a read/write operation according to the memory access request with respect to the memory module when it is determined by the first address determination unit that the memory address corresponds to the memory module; And when it is determined by the first address determination unit that the memory address corresponds to the local memory or storage of the host device, to perform a read/write operation according to the memory access request with respect to the local memory or the storage. It contains a configured host access unit.

The memory card is an expansion memory configured to perform a read/write operation according to the memory access request with respect to the memory expansion card when it is determined by the first address determination unit that the memory address corresponds to a memory expansion card It may further include an access unit.

The first address determination unit includes an address register, wherein the address register includes a total memory address area provided by the memory card, a physical address of the memory module, a physical address of a memory expansion card, and a physical address of a usable host local memory. It may include at least one of an address, an address of an usable storage space, and mapping information for an entire memory address area and a physical address area.

The first address determination unit is configured to manage tag information for each memory access request information, and to transmit response data along with tag information to the protocol engine when response data according to a read operation of a memory access request is received. Can be.

The host access unit includes: a direct memory access (DMA) engine configured to perform read/write operations on a local memory and a storage caching area of the host device; And a doorbell register.

The doorbell register includes a physical address of a local memory used as a storage cache, a physical address of a local memory used as a storage buffer, an address of a currently cached storage space, and a DMA completion when a write request to the storage space is requested. A doorbell to notify the central processing unit (CPU) of the storage space, a doorbell to notify the CPU that a request has been received when a read request for storage space is requested, and a door to notify the memory card that data is ready for a read request to the storage space It may include at least one of the bells.

When the access target of the memory access request is an address area of the storage of the host device and the corresponding address area is cached, the host access unit is a local area in which the storage space is cached in the local memory through the DMA engine. It can be configured to read/write by accessing the memory area.

When the access target of the memory access request is an address area of the storage of the host device and the corresponding address area is not cached, and the requested operation is a write operation, the host access unit may access the local memory through the DMA engine. It can be configured to access and write to a memory area used as a storage buffer.

The host access unit informs the CPU of the host device when an access target of the memory access request is an address area of the storage of the host device and the address area is not cached, and the requested operation is a read operation. The CPU brings the corresponding area to the caching area and writes the address of the corresponding caching area in the doorbell register to record that caching is complete, and when it is recognized that the caching is completed by polling the doorbell register , The host access unit may be further configured to access the cached storage space of the local memory through DMA and perform a read operation.

Meanwhile, the memory card may further include a controller that performs data read/write operations on the memory module in connection with the memory access unit.

The memory expansion card connected to the memory card includes: a memory module; A first input port and a first output port forming a communication channel with the memory card; And a memory access request from the memory card transmitted through the first input port determines a target, and when the target is a memory module of the memory expansion card, a read/write operation is performed on the memory module. A second address determination unit may be included, and response data according to a read operation performed from the second address determination unit may be transmitted to the memory card through the first output port.

The memory expansion card may further include a second input port and a second output port forming a communication channel with another memory expansion card, and the second address determination unit is a target of a memory access request from the memory card. In the case of this other memory expansion card, it may be configured to transmit the memory access request to another memory expansion card through the second output port, and the request transmitted to the other memory expansion card through the second output port is After response data is input through the second input port, it may be transferred to the memory card through the first output port.

A method according to another embodiment of the present invention is a method of processing data using a memory card, the method comprising: receiving a memory access request by a memory card connected to a system bus of a host device; When the access target of the memory access request is a local memory of the host device, the memory card accessing a corresponding memory area of the local memory and performing data read/write processing; And performing data read/write processing by accessing a memory area in which the storage space is cached in the local memory of the host device when the access target of the memory access request is the address area of the storage of the host device. do.

In the step of performing data read/write processing by accessing the corresponding memory area of the local memory, the memory card may read/write to the corresponding memory area of the local memory using DMA.

The step of performing data read/write processing by accessing the memory area in which the storage space is cached includes, when the access target of the memory access request is an address area of the storage of the host device and the corresponding address area is cached, The memory card may include performing read/write by accessing a local memory area in which the storage space is cached in the local memory through DMA.

In the step of performing data read/write processing by accessing the memory area in which the storage space is cached, the access target of the memory access request is an address area of the storage of the host device and the corresponding address area is not cached, When the requested operation is a write operation, the memory card may access a memory area used as a storage buffer of the local memory through DMA to perform writing, and after performing the write operation, the The host device's CPU can perform the caching procedure for that area.

In the step of performing data read/write processing by accessing the memory area in which the storage space is cached, the access target of the memory access request is an address area of the storage of the host device and the corresponding address area is not cached, When the requested operation is a read operation, the memory card informs the CPU of the host device so that the CPU performs caching of the storage address area and writes the address of the corresponding caching area in the doorbell register to indicate that caching is complete. Making it record; And when the caching is completed, the memory card accesses the cached storage space of the local memory through DMA to perform a read operation.

The method may further include processing data read/write in the memory card itself when the access target of the memory access request is a memory installed in the memory card.

The method comprises, when the access target of the memory access request is a memory expansion card connected to the memory card, transfers the access request to the memory expansion card, and reads/writes data from the memory expansion card. It may further include receiving the result according to.

The method, wherein the memory expansion card receives the access request, and when the object of the access request is another memory expansion card, transmits the access request to another memory expansion card, and reads data from the memory expansion card It may further include the step of receiving the result of the /write process and transferring the result to the memory card or the memory expansion card of the previous step connected in a chain manner.

When a server equipped with an expandable end memory card according to an embodiment of the present invention is used as a memory pool, when implementing a system mounted in a rack, a system can be simply constructed using an existing server without making a separate chassis. In addition, the server's local memory can be used as a memory pool space. In addition, a memory space having a capacity that is difficult to provide in general can be provided by using the storage space of the server. Therefore, the capacity of the system can be expanded by utilizing the memory and storage of the server as a memory pool.

1 is a diagram illustrating a structure of a memory server with an expanded memory capacity according to an embodiment of the present invention.
2 is a diagram showing a specific structure of a memory card according to an embodiment of the present invention.
3 is a diagram showing a detailed structure of a memory expansion card according to an embodiment of the present invention.
4 is a flowchart of a data processing method according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present invention. However, the present invention may be implemented in various forms and is not limited to the embodiments described herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and similar reference numerals are assigned to similar parts throughout the specification.

Throughout the specification, when a certain part "includes" a certain component, this indicates that other components may be further included rather than excluding other components unless otherwise stated.

Expressions described in the singular in this specification may be interpreted as the singular or plural unless an explicit expression such as "one" or "single" is used.

In addition, terms including ordinal numbers such as first and second used in the embodiments of the present invention may be used to describe the elements, but the elements should not be limited by terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component.

Next, a memory card according to an embodiment of the present invention and a data processing method using the same will be described with reference to the accompanying drawings.

1 is a diagram illustrating a structure of a memory server with an expanded memory capacity according to an embodiment of the present invention.

In an embodiment of the present invention, the memory server 1 includes a central processing unit (CPU) 11, a local memory 12, and a storage 13, as shown in FIG. 1, and the memory card 14 And the memory expansion card 15 can be used to expand the memory capacity. Note that in the present embodiment, the memory server 1 may be referred to as a host device in the sense of a subject that manages a memory card, and is different from an external computing host using a memory card.

One memory card 14 is mounted in one server, and the memory expansion card 15 is configured to be mounted as many as the number of remaining Peripheral Component Interconnect Express (PCIe) slots if necessary.

The memory server 1 may be recognized as a huge memory module by being connected to an external computing server by a cable. The cable is connected to the memory card 14, and the memory card 14 includes a protocol processing function. The memory card 14 has its own memory, which is a memory space that can be accessed with the lowest delay time.

The memory expansion card 15 is directly connected to the memory card 14 by a cable, or connected to another memory expansion card in a daisy chain method. If the memory access request address received by the memory card 14 corresponds to a memory space of the memory expansion card 15, the memory card 14 requests data access from the memory expansion card 15. The memory expansion card 15 accesses a corresponding memory address area, writes data or reads data, and transfers the data to the memory card 14. If the requested address is not an address area allocated to its own physical memory, it sends a data access request to another memory expansion card chained to the rear port. When the data access result arrives from the rear port, the memory expansion card 15 transmits it to the front port. Here, it is exemplified that there are two memory expansion cards 15, but the present invention is not limited thereto.

The address area of the memory server 1 having such a structure may be further expanded in addition to the two cases described above.

A partial space of the local memory 12 is used as a space accessible from the outside. The CPU 11 allocates a part of the local memory 12 as an externally accessible area and informs the memory card 14 of this. When a request for access to a corresponding area is received, the memory card 14 converts to a physical address of the corresponding local memory 12, and then can directly access it through direct memory access (DMA).

In addition, the space of the storage 13 of the memory server 1 may be utilized as a space capable of external access. In this case, the CPU 11 sets a partial region of the storage 13 as an externally accessible region, and uses a certain region of the local memory 12 as a cache and buffer for the storage region. Hereinafter, for convenience of description, a partial area of the storage set as an externally accessible area is referred to as "storage space". The memory card 14 notifies the CPU 11 when an access request to the address area of the storage 13 is received, and the CPU 11 directly engages in accessing data to the address area of the storage 13 Process the request.

2 is a diagram showing a specific structure of a memory card according to an embodiment of the present invention.

The memory card 14 according to the embodiment of the present invention includes a memory module 141, a controller 142, a host access unit 143, a memory access unit 144, and an extended memory access unit ( 145), an address determination unit 146, and a protocol engine 147. Here, the memory module 141 may be a double data rate (DDR) memory module, and the controller 142 may be a DDR controller.

When a memory access request is received from the outside, the protocol engine 147 analyzes the packet corresponding to the received request according to a memory connection network protocol such as Gen-Z, transmits ACK/NACK packets according to the protocol, and handles errors, etc. Is configured to perform. When the received packet is a normal memory access packet, the protocol engine 147 transfers the received packet to the address determination unit 146, and when the received packet corresponds to a read request, the received packet is transmitted from the address determination unit 146. It is configured to transmit memory data to the outside according to the protocol.

The address determination unit 146 receives a packet transmitted from the protocol engine 147, and determines in which physical space the corresponding memory address is in accordance with a memory access request of the received packet. According to the determination result, a request for read/write is transmitted to the host access unit 143, the memory access unit 144, or the extended memory access unit 145. In addition, tag information is managed for each request, and when a response to a read request is received from each unit 143 to 145, it is transmitted to the protocol engine 147 together with the tag information. The address determination unit 146 includes an address register 1461.

The address register 1461 is a register set by the CPU and stores the following information.

메모리 카드가 제공하는 전체 메모리 주소 영역

Total memory address area provided by the memory card

카드 내부의 메모리 모듈의 물리 주소

Physical address of the memory module inside the card

메모리 확장 카드의 물리 주소

Physical address of the memory expansion card

사용 가능한 호스트 로컬 메모리의 물리 주소

Physical address of available host local memory

사용 가능한 스토리지 공간의 물리 주소

Physical address of available storage space

전체 메모리 주소 영역과 물리 주소 영역에 대한 매핑 정보

Mapping information for the entire memory address area and physical address area

Here, the physical address of the storage space represents an address allocated by the CPU to an externally accessible storage area in order to map to a memory space viewed from the outside.

The memory access unit 144 is configured to process an access request for the memory module 141 physically present in the memory card 14. The memory access unit 144 interfaces with the DDR controller 142 to read or write data to the memory module 141.

The extended memory access unit 145 is configured to perform a memory read/write request through an interface with the memory card 15 when there is a memory expansion card 15 mounted in the memory server 1.

When there is a memory access request for the local memory 12 and the storage 13 of the memory server 1, the host access unit 143 interfaces with the CPU 11 or the local memory 12 of the memory server 1 Thus, it is configured to read/write data to the local memory 12 and the storage 13. The host access unit 143 includes a DMA engine 1431 and a doorbell register 1432. In addition, the host access unit 143 has a PCIe endpoint core (not shown) for communicating with the CPU 11. The DMA engine 1431 is hardware for accessing the local memory 12 without interference from the CPU 11. The doorbell register 1432 is a register file for communication with the CPU 11, and includes the following information.

스토리지 버퍼로 사용되는 로컬 메모리의 물리 주소

Physical address of local memory used as storage buffer

현재 캐싱되어 있는 스토리지 공간의 물리 주소 및 해당 스토리지 캐시로 사용되는 로컬 메모리의 물리 주소 테이블

Table of physical addresses of currently cached storage spaces and physical addresses of local memory used by the corresponding storage cache

스토리지 공간에 대한 쓰기 요청시 DMA 완료를 CPU에게 알리기 위한 도어벨

Doorbell to notify CPU of DMA completion when requesting to write to storage space

스토리지 공간에 대한 읽기 요청시 요청이 수신되었음을 CPU에게 알리기 위한 도어벨

Doorbell to notify the CPU that the request has been received when requesting to read storage space

스토리지 공간에 대한 읽기 요청에 대해 데이터가 준비되었음을 메모리 카드에게 알리기 위한 도어벨

Doorbell to inform the memory card that data is ready for a read request for storage space

3 is a diagram showing a detailed structure of a memory expansion card according to an embodiment of the present invention.

The memory expansion card 15 according to an exemplary embodiment of the present invention includes a memory module 151, a controller 152, an address determination unit 153, a merge unit 154, as shown in FIG. 3. It includes a front input port 155, a front output port 156, a bypass output port 157, and a bypass input port 168. Here, the memory module 151 may be a DDR memory module, and the controller 152 may be a DDR controller.

The memory expansion card 15 may be connected to the memory card 14 in a daisy chain manner, so that data read/write may be performed by interfacing with another memory expansion card.

The front input port 155 receives an input from the memory card 14 or another memory expansion card connected to the front in a chain and transmits the input to the address determination unit 153. The front input port 155 may also be referred to as a first input port for convenience of description.

The front output port 156 transfers the results from the address determination unit 153, the controller 152 or the merge unit 154 to the memory card 14 or another memory expansion card that is chained to the front. The front output port 156 may also be referred to as a first output port for convenience of description.

The bypass input port 158 receives an input from another memory expansion card connected in a chain at the rear and transmits the input to the address determination unit 153, the controller 152 or the merge unit 154. The bypass input port 158 may also be referred to as a second input port for convenience of description.

The bypass output port 157 transfers the request from the address determination unit 153 to another memory expansion card that is chained to the rear. The bypass output port 157 may also be referred to as a second output port for convenience of description. Another memory expansion card may be connected to the bypass output port 157 and the bypass input port 158.

When a memory access request for the memory expansion card 15 occurs from the memory card 14, the memory access request from the extended memory access unit 145 of the memory card 14 is sent to the address determination unit through the front input port 155. It is delivered to (153). The address determination unit 153 includes an address register 1531, and the address register 1531 stores a physical address allocated to the memory module 151 it has. The address register 1521 is set by the CPU 11 of the host during system initialization. The address determination unit 153 accesses the memory module 151 through the controller 152 when the address of the input memory access request matches the address stored in the address register 1531. If the operation of the memory access request is a read operation, the address determination unit 153 transfers the data read from the memory module 151 through the controller 152 to the merge unit 154. When the operation of the memory access request is a write operation, the address determination unit 153 writes data to a corresponding address of the memory module 151 through the controller 152.

If the address of the input memory access request does not match the address stored in the address register 1531, the address determination unit 153 transmits the corresponding memory access request to another memory expansion card through the bypass output port 157. Another memory expansion card that has received a memory access request through the bypass output port 157 performs a memory access request operation, and in the case of a read operation, reads and transmits the data of the corresponding address. Accordingly, the bypass input port 158 The relevant data is entered through ).

Data input from another memory expansion card through the bypass input port 158 is transferred to the merging unit 154.

The merging unit 154 transfers data provided from the address determination unit 153 or the bypass input port 158 to the memory card 14 through the front output port 156.

Next, a method of processing data using a memory card according to an embodiment of the present invention will be described.

4 is a flowchart of a data processing method according to an embodiment of the present invention.

Specifically, FIG. 4 shows that the host access unit 143 of the memory card 14 according to the embodiment of the present invention interfaces with the CPU 11 or the local memory 12 of the host, so that the local memory 12 and the storage ( 13) is a flow diagram of a method of processing data by reading/writing data. First, it is determined whether the memory request is for the memory areas 141 and 151 mounted on the card, and if it is for the memory area mounted on the card, the memory card and the extended memory card process data access, which is shown in FIG. Not mentioned.

Hereinafter, whether the access target of the memory request is a local memory or an address area of the storage space may be determined based on information stored in the address register 1461 of the address determination unit 146 of the memory card 14.

4, the host access unit 143 of the memory card 14 is in a standby state (S100), a memory request is input, and access to the memory area mounted on the corresponding memory card or the extended memory card is Otherwise, it is first determined whether the access target of the memory request is the local memory 12 or an address area of the storage space (S110). When the local memory is an access target, the host access unit 143 reads/writes to a corresponding memory area of the local memory 12 using DMA (S120). In this case, if the memory request relates to read, the host access unit 143 transfers the data read from the local memory 12 to the address determination unit 146 using DMA. If the memory request relates to a write, the host access unit 143 writes data to the corresponding memory area of the local memory 12 using DMA.

Meanwhile, when the access target of the memory request is an address area of the storage space, it is determined whether the corresponding address area is in a cached state (S130). If the corresponding address area is in a cached state, the host access unit 143 accesses the cached local memory area through DMA and performs read/write (S140). That is, if the access target of the memory request corresponds to information stored in the doorbell register 1432, that is, the physical address of the cached storage space, the host access unit 143 uses the physical address of the local memory mapped to the storage cache. Read/write is performed by accessing the cached storage space of the local memory 12 through DMA. Processing according to the read/write may be performed as described above (see step S120). When the processing according to the read/write is completed, the host access unit 143 records that the operation according to the processing is completed in the doorbell register (S150). Thereafter, the CPU 11 recognizes that the caching area has been accessed through an additional interrupt or polling of the CPU 11, and accordingly, the CPU 11 performs a write back to the storage space. Or, you can add information to the cache management policy.

Meanwhile, when the access target of the memory request is an address area of the storage space and is not cached, the host access unit 143 determines whether the operation of the corresponding memory request is a read operation or a write operation (S160). In the write operation, the host access unit 143 writes data through DMA to a local memory area allocated as a storage buffer (S170). That is, if the access target of the memory request does not correspond to the physical address of the cached storage space stored in the doorbell register 1432, the host access unit 143 uses the physical address of the local memory used as the storage buffer. Through this, an area allocated as a storage buffer of the local memory 12 is accessed and written. When the processing according to the writing is completed, the host access unit 143 records that the operation according to the processing is completed in the doorbell register (S150). Accordingly, the CPU 11 writes back data in the storage buffer area of the local memory to the actual storage space, and performs an operation of bringing the corresponding space to the cache area.

Meanwhile, in step S160, in the case of a read operation, the host access unit 143 writes the address to the doorbell register 1432 and requests the CPU 11 to read (S180). The CPU 11 acquires a storage physical address through an interrupt or polling the doorbell register 1432, brings the storage area data corresponding to the obtained address to the caching area, and indicates that caching is completed, along with the address of the caching area. Writes to the bell register 1432. The host access unit 143 polls the corresponding doorbell of the doorbell register 1432 (S190), and when it recognizes that caching is complete, accesses the corresponding caching area through DMA (S200). That is, a read operation is performed by accessing the cached storage space of the local memory 12 through DMA.

According to such an embodiment of the present invention, the server may be used as a memory pool by mounting an expandable end memory card in the server. When implementing a system mounted on a rack, a system can be simply constructed using an existing server without a separate chassis, and the server's local memory can be used as a memory pool space. Also, a memory space having a capacity that is difficult to provide in general can be provided by using the storage space of the server.

The embodiment of the present invention, in the configuration of a memory pool to be used for memory-centric computing, can be applied to a protocol engine for processing a memory connection network protocol, a memory device to be used as an actual memory, and an expansion device management technology mounted on a PC or server And memory bus expansion technology.

All or part of the above-described embodiments may be implemented by software, hardware, firmware, or any combination thereof. When software is used to implement an embodiment, the embodiment may be fully or partially implemented in the form of a computer program product. The computer program product includes one or more computer instructions.

When computer program instructions are loaded and executed on a computer, the procedures or functions according to the present invention are created in whole or in part. The processing device may be a general purpose computer, a dedicated computer, a computer network or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted using a computer-readable storage medium.

The embodiments of the present invention are not implemented only through the apparatus and/or method described above, but may be implemented through a program for realizing a function corresponding to the configuration of the embodiment of the present invention, a recording medium in which the program is recorded. Also, such implementation can be easily implemented by an expert in the technical field to which the present invention belongs from the description of the above-described embodiment.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

Claims (20)

A memory card connected to the host device's system bus,
Memory module;
A protocol engine configured to receive a memory access request and transmit data according to the memory access request;
A first address determination unit configured to determine in which physical space a memory address included in a memory access request transmitted from the protocol engine is located;
A memory access unit configured to perform a read/write operation according to the memory access request with respect to the memory module when it is determined by the first address determination unit that the memory address corresponds to the memory module; And
When it is determined by the first address determination unit that the memory address corresponds to the local memory or storage of the host device, the local memory or the storage is configured to perform a read/write operation according to the memory access request Host access unit
A memory card comprising a. The method of claim 1,
When it is determined by the first address determination unit that the memory address corresponds to a memory expansion card, an expanded memory access unit configured to perform a read/write operation according to the memory access request with respect to the memory expansion card
The memory card further comprising. The method of claim 2,
The first address determination unit includes an address register, wherein the address register includes a total memory address area provided by the memory card, a physical address of the memory module, a physical address of a memory expansion card, and a physical address of a usable host local memory. The memory card comprising at least one of an address, an address of an usable storage space, and mapping information for an entire memory address area and a physical address area. The method of claim 1,
The first address determination unit is configured to manage tag information for each memory access request information, and to transmit response data along with tag information to the protocol engine when response data according to a read operation of a memory access request is received. Being, the memory card. The method of claim 1,
The host access unit,
A direct memory access (DMA) engine configured to perform read/write operations on a local memory and a storage caching area of the host device; And
Doorbell register
Including a memory card. The method of claim 5,
The doorbell register includes a physical address of a local memory used as a storage cache, a physical address of a local memory used as a storage buffer, an address of a currently cached storage space, and a DMA completion when a write request to the storage space is requested. A doorbell to notify the central processing unit (CPU) of the storage space, a doorbell to notify the CPU that a request has been received when a read request for storage space is requested, and a door to notify the memory card that data is ready for a read request to the storage space A memory card comprising at least one of bells. The method of claim 5,
When the access target of the memory access request is an address area of the storage of the host device and the corresponding address area is cached, the host access unit is a local area in which the storage space is cached in the local memory through the DMA engine. A memory card, configured to read/write by accessing a memory area. The method of claim 5,
When the access target of the memory access request is an address area of the storage of the host device and the corresponding address area is not cached, and the requested operation is a write operation, the host access unit may access the local memory through the DMA engine. A memory card that is configured to perform writes by accessing an area of memory used as a storage buffer. The method of claim 5,
The host access unit informs the CPU of the host device when an access target of the memory access request is an address area of the storage of the host device and the address area is not cached, and the requested operation is a read operation. The CPU brings the corresponding area to the caching area and writes the address of the corresponding caching area in the doorbell register to record that caching is complete,
When it is recognized that caching is completed by polling the doorbell register, the host access unit is further configured to access the cached storage space of the local memory through DMA and perform a read operation. . The method of claim 1,
The memory card further comprising a controller that performs data read/write operations for the memory module in connection with the memory access unit. The method of claim 2,
The memory expansion card connected to the memory card,
Memory module;
A first input port and a first output port forming a communication channel with the memory card; And
A memory access request from the memory card transmitted through the first input port determines a target, and when the target is a memory module of the memory expansion card, a read/write operation is performed on the memory module 2 Address determination unit
Including,
A memory card, wherein response data according to a read operation performed by the second address determination unit is transmitted to the memory card through the first output port. The method of claim 11,
The memory expansion card,
A second input port and a second output port forming a communication channel with another memory expansion card
Including more,
The second address determination unit is configured to transmit the memory access request to another memory expansion card through the second output port when a target of the memory access request from the memory card is another memory expansion card,
A memory card, wherein response data for a request transmitted to the other memory expansion card through the second output port is input through the second input port and then transferred to the memory card through the first output port. As a method of processing data using a memory card,
Receiving a memory access request by a memory card connected to the system bus of the host device;
When the access target of the memory access request is a local memory of the host device, the memory card accessing a corresponding memory area of the local memory and performing data read/write processing; And
When the access target of the memory access request is the address area of the storage of the host device, performing data read/write processing by accessing the memory area in which the storage space is cached in the local memory of the host device
Containing, data processing method. The method of claim 13,
The step of performing data read/write processing by accessing a corresponding memory area of the local memory, the memory card performing read/write to a corresponding memory area of the local memory by using DMA. The method of claim 13,
The step of performing data read/write processing by accessing the memory area in which the storage space is cached,
When the access object of the memory access request is an address area of the storage of the host device and the corresponding address area is cached, the memory card is in the local memory area in which the storage space is cached through DMA. A method of processing data comprising the step of accessing and performing read/write. The method of claim 13,
The step of performing data read/write processing by accessing the memory area in which the storage space is cached,
When the access target of the memory access request is an address area of the storage of the host device, the address area is not cached, and the requested operation is a write operation, the memory card is transferred to the storage buffer of the local memory through DMA. Steps to access and write the used memory area
Including,
After the step of performing the writing, the CPU of the host device performs a caching procedure of a corresponding region. The method of claim 13,
The step of performing data read/write processing by accessing the memory area in which the storage space is cached,
When the access target of the memory access request is an address area of the storage of the host device, and the address area is not cached, and the requested operation is a read operation, the memory card informs the CPU of the host device, and the Causing the CPU to perform caching of the storage address area and write the address of the corresponding caching area in a doorbell register to record that the caching is completed; And
Upon completion of the caching, performing a read operation by accessing the memory card to the cached storage space of the local memory through DMA
Containing, data processing method. The method of claim 13,
When the access target of the memory access request is a memory installed in the memory card, processing data read/write in the memory card itself
Data processing method further comprising a. The method of claim 13,
When the access target of the memory access request is a memory expansion card connected to the memory card, the access request is transmitted to the memory expansion card, and a result of the read/write processing of data from the memory expansion card is received. Steps to
Data processing method further comprising a. The method of claim 19,
The memory expansion card receives the access request, and when the object of the access request is another memory expansion card, transfers the access request to another memory expansion card, and reads/writes data from the memory expansion card. Receiving the result and transferring it to the memory card or the memory expansion card of the previous step connected in a chain manner
Data processing method further comprising a.

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