WO2017084415A1

WO2017084415A1 - Memory switching method, device, and computer storage medium

Info

Publication number: WO2017084415A1
Application number: PCT/CN2016/098115
Authority: WO
Inventors: 赵世凡; 孙志文
Original assignee: 深圳市中兴微电子技术有限公司
Priority date: 2015-11-17
Filing date: 2016-09-05
Publication date: 2017-05-26
Also published as: CN106708747A

Abstract

A memory switching method, apparatus and computer storage medium. The method comprises: configuring a Cache RAM to be a TCM RAM (101); determining a memory to be accessed by a received request (102); generating a request for accessing the Cache RAM when the memory to be accessed by the received request is the Cache RAM (103); generating a request for accessing the TCM RAM when the memory type to be accessed by the received request is the TCM RAM (104); and sending the generated access request to a corresponding RAM (105).

Description

Memory switching method, device and computer storage medium

Technical field

The present invention relates to data storage technologies, and in particular, to a memory switching method, apparatus, and computer storage medium for implementing dynamic switching of a cache and a Tightly Coupled Memory (TCM).

Background technique

In the processor architecture, the storage system is hierarchical, and the closer to the core, the smaller the size, the faster the read and write speed. In the existing processor system, in addition to L1Cache and L2Cache, most processor systems also have L1TCM; L1TCM is fast and the access time is determined, but usually it is small in size and cannot fully meet the actual needs. When the program with high access speed is required to work or the data cannot be placed in the L1TCM, the usual method is to define the program or the corresponding data as a Cacheable attribute and store it in the Cache. However, the disadvantage of this is that after the Cache has passed the delay of the query, if the hit, the access time is relatively short, and if there is no hit, the access time is still very long.

Summary of the invention

In view of this, embodiments of the present invention are expected to provide a memory switching method, apparatus, and computer storage medium, which can effectively shorten the access time of the memory and improve the access performance.

To achieve the above objective, the technical solution of the embodiment of the present invention is implemented as follows:

The embodiment of the invention provides a memory switching method, including:

Configure the Cache RAM as TCM RAM;

Determining the memory to be accessed by the received request, when the memory to be accessed by the received request is Cache RAM, generating a request to access the Cache RAM; when receiving the request The type of memory to be accessed is TCM RAM, generating a request to access the TCM RAM;

The generated access request is sent to the corresponding RAM.

As an implementation manner, the configuring the Cache RAM as the TCM RAM includes:

Configure some of the Cache RAM as TCM RAM; or,

Configure all Cache RAM as TCM RAM.

Change the allocation algorithm of Cache RAM, and do not query and allocate the Cache RAM to be configured as TCM RAM;

The Cache RAM that does not perform query and allocation establishes a one-to-one mapping of the TCM address space and the TCM RAM, and configures the Cache RAM as a TCM RAM.

As an implementation manner, the method further includes: transferring data in the Cache RAM to be configured as a TCM RAM to a memory.

As an embodiment, the method further includes: restoring the TCM RAM to a Cache RAM, and transferring data in the TCM RAM to a memory.

The embodiment of the invention further provides a memory switching device, the device comprising: a configuration module and a control module, wherein

The configuration module is configured to configure the Cache RAM as a TCM RAM;

The control module is configured to determine a memory to be accessed by the received request, and generate a request for accessing the Cache RAM when the memory to be accessed by the received request is a Cache RAM; and the memory type to be accessed when the received request is TCM The RAM generates a request to access the TCM RAM; the generated access request is sent to the corresponding RAM.

As an implementation manner, the configuration module is configured to: configure a part of the Cache RAM as a TCM RAM; or configure the entire Cache RAM as a TCM RAM.

As an implementation manner, the configuration module is configured to:

Change the Cache RAM allocation algorithm for the Cache RAM that will be configured as TCM RAM Do not query and assign;

As an implementation manner, the configuration module is further configured to: transfer data in the Cache RAM to be configured as a TCM RAM to a memory.

As an implementation manner, the configuration module is further configured to: restore the TCM RAM to a Cache RAM, and transfer data in the TCM RAM to a memory.

The embodiment of the invention further provides a computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the memory switching method according to the embodiment of the invention.

The memory switching method and device and the computer storage medium provided by the embodiments of the present invention configure the Cache RAM as the TCM RAM; determine the memory to be accessed by the received request, and generate the memory to be accessed when the received request is the Cache RAM. The request to access the Cache RAM; when the received request is to access the memory type TCM RAM, generate a request to access the TCM RAM, and then send the generated access request to the corresponding RAM. In this way, the existing Cache RAM can be dynamically used as the TCM, and the TCM and the Cache can be dynamically switched without increasing the RAM cost; the access to the Cache RAM and the TCM RAM can be simultaneously realized, and the data access speed is significantly improved. And guarantee data consistency.

DRAWINGS

1 is a schematic flowchart of a memory switching method according to an embodiment of the present invention;

2 is a schematic flowchart of a memory switching method according to Embodiment 2 of the present invention;

3 is a schematic structural diagram of a memory switching device according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a control module according to an embodiment of the present invention.

detailed description

In the embodiment of the present invention, the Cache RAM is first configured as a TCM RAM; then, the memory to be accessed by the received request is determined, and when the memory to be accessed by the received request is the Cache RAM, a request for accessing the Cache RAM is generated; when receiving The type of memory to be accessed by the request is TCM RAM, a request to access the TCM RAM is generated, and the generated access request is sent to the corresponding RAM.

The implementation of the technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. FIG. 1 is a schematic flowchart of a memory switching method according to an embodiment of the present invention. As shown in FIG. 1 , the memory switching method in this embodiment includes the following steps:

Step 101: Configure the Cache RAM as TCM RAM.

The configuring the Cache RAM as the TCM RAM includes: configuring a part of the Cache RAM as the TCM RAM; or configuring all the Cache RAMs as the TCM RAM; in actual applications, selecting some or all of the Cache RAMs according to actual needs may be configured as TCM RAM, for example, when the system requires high speed of data reading and writing, and the amount of data involved is large, all Cache RAMs can be configured as TCM RAM; when the system requires data reading and writing speed is general, and involved When the amount of data is small, a part of the Cache RAM can be configured as TCM RAM, and the Cache RAM address range to be configured as TCM RAM is determined according to actual needs.

Specifically, by changing the lockdown by way configuration of the Cache RAM, changing the allocation algorithm of the Cache RAM, not querying and allocating the Cache RAM to be configured as the TCM RAM; establishing the TCM address of the Cache RAM not being queried and allocated. A one-to-one mapping of space and TCM RAM, configuring the Cache RAM as TCM RAM.

In the embodiment of the present invention, before the Cache RAM is configured as the TCM RAM, the method further includes: transferring the data in the Cache RAM to be configured as the TCM RAM to the memory.

Step 102: Determine the memory to be accessed by the received request, when the memory to be accessed by the received request is Cache RAM, perform step 103; when the received request is to be accessed The memory type is TCM RAM, and step 104 is performed.

Step 103: Generate a request to access the Cache RAM.

Step 104: Generate a request to access the TCM RAM.

In the embodiment of the present invention, since the TCM address space and the TCM RAM are one-to-one mapping, that is, accessing the TCM RAM is equivalent to 100% hit, therefore, the request for accessing the TCM RAM can be directly generated; and accessing the Cache RAM requires first querying whether to hit. If the hit, a request to access the Cache RAM is generated to access the corresponding RAM; if there is no hit, it is necessary to access the next-level storage structure.

Step 105: Send the generated access request to the corresponding RAM.

In the embodiment of the present invention, after the request for accessing the Cache RAM and accessing the TCM RAM is generated, arbitration processing is performed separately, and the arbitrated request is obtained and sent to the corresponding RAM. In the embodiment of the present invention, the TCM RAM and the Cache RAM can be accessed at the same time, and the access control processes of the TCM RAM and the Cache RAM are independent of each other, thereby improving parallelism. In the case of simultaneous access to the TCM RAM and Cache RAM, the TCM RAM and the Cache RAM may return data at the same time. Therefore, it is necessary to simultaneously process the data, complete the data read operation and/or write operation, and return the data and response.

In the embodiment of the present invention, the method further includes: restoring the TCM RAM to a Cache RAM, and transferring data in the TCM RAM to a memory.

In the embodiment of the present invention, according to actual needs, when the system needs TCM RAM, the Cache RAM is configured as TCM RAM; when the system no longer needs TCM RAM, the TCM RAM can be restored to Cache RAM; When the RAM is configured as TCM RAM, the data in the Cache RAM can be flushed to the memory; when the TCM RAM is restored to the Cache RAM, the data in the TCM RAM can be transferred to the memory to maintain data consistency. .

2 is a schematic flowchart of a memory switching method according to Embodiment 2 of the present invention, as shown in FIG. 2, An embodiment memory switching method includes the following steps:

Step 201: Close the Cache RAM.

Step 202: Flush the data of the TCM RAM to be configured as the TCM RAM into the memory.

Step 203: Configure the Cache RAM as a TCM RAM.

In this step, you can choose to configure all Cache RAM or part of Cache RAM as TCM RAM according to actual needs.

Step 204: Open the Cache RAM.

In this step, if the Cache is opened for the first time, the initialization of the Cache needs to be completed.

Step 205: Initialize the TCM RAM.

In this step, the TCM can be filled by the DMA to transfer data from the memory; other initialization methods can also be used, and are not limited to this range.

Step 206: Receive a request to access the TCM RAM and the Cache RAM, and access the corresponding TCM RAM and the Cache RAM according to the request.

Specifically, according to the received request, an access request for accessing the TCM RAM and the Cache RAM is generated, and the corresponding TCM RAM and the Cache RAM are accessed.

Step 207: When the TCM is not needed, the data in the TCM is transferred to the memory.

In this step, if you need to save the data in the TCM, you can move the data in the TCM to memory through DMA.

Step 208: Restore the TCM RAM to a Cache RAM.

Step 209: Access the Cache RAM.

If you want to reconfigure the Cache RAM as TCM RAM, go to step 201.

In the embodiment of the present invention, the existing Cache RAM is used dynamically as the TCM RAM, and no new RAM is needed, and the dynamic switching between the TCM RAM and the Cache RAM is realized without increasing the RAM cost, and the Cache RAM is simultaneously accessed. Part and TCM RAM part, Can significantly improve data access speed. Since the address of the TCM RAM portion is a part of the entire address space, the memory switching method according to the embodiment of the present invention can also ensure data consistency.

The embodiment of the present invention further provides a structure diagram of a memory switching device, the device Cache controller, and FIG. 3 is a schematic structural diagram of a memory switching device according to an embodiment of the present invention. As shown in FIG. 3, the device includes: a configuration module 31 and Control module 32, wherein

The configuration module 31 is configured to configure the Cache RAM as a TCM RAM;

The control module 32 is configured to determine a memory to be accessed by the received request, and when the memory to be accessed by the received request is a Cache RAM, generate a request to access the Cache RAM; when the received request is to access the memory type is The TCM RAM generates a request to access the TCM RAM; the generated access request is sent to the corresponding RAM.

In the embodiment of the present invention, the configuration module is configured to: configure part of the Cache RAM as TCM RAM; or configure all Cache RAMs as TCM RAM. In practical applications, some or all of the Cache RAM can be configured as TCM RAM according to actual needs. For example, when the system requires high data read/write speed and the amount of data involved is large, all Cache RAMs can be used. Configured as TCM RAM; when the system requires normal data read/write speed and the amount of data involved is small, a part of the Cache RAM can be configured as TCM RAM, and the Cache RAM address range to be configured as TCM RAM is determined according to actual needs.

Specifically, the configuration module 31 changes the Cache RAM allocation algorithm by changing the lockdown by way configuration of the Cache RAM, and does not query and allocate the Cache RAM to be configured as the TCM RAM; and the query and allocation are not performed. The Cache RAM establishes a one-to-one mapping of the TCM address space and the TCM RAM, and configures the Cache RAM as a TCM RAM.

In the embodiment of the present invention, before configuring the Cache RAM as the TCM RAM, the configuration module 31 is further configured to transfer data in the Cache RAM to be configured as the TCM RAM to the memory.

4 is a schematic structural diagram of a control module according to an embodiment of the present invention. As shown in FIG. 4, the control module 32 includes: a request receiving submodule 321, a first request generating submodule 322, and a second request generating submodule 323, An arbitration sub-module 324, a second arbitration sub-module 325, and a response sub-module 326, wherein

The request receiving sub-module 321 is configured to receive the request and determine the memory to be accessed by the received request, and notify the first request generating sub-module 322 when the received memory to be accessed is the Cache RAM, when received When the type of memory to be accessed by the request is TCM RAM, the second request generating submodule 323 is notified;

The first request generation submodule 322 is configured to generate a request for accessing the Cache RAM when the memory to be accessed by the received request is a Cache RAM; and send the request for accessing the Cache RAM to the first arbitration submodule 324 ;

The second request generation submodule 323 is configured to generate a request for accessing the TCM RAM when the received memory type of the request is TCM RAM, and send the request for accessing the TCM RAM to the second arbitration submodule 325. ;

The first arbitration sub-module 324 is configured to perform arbitration processing on the received request for accessing the Cache RAM, and send the request after the arbitration processing to the Cache RAM;

The second arbitration sub-module 325 is configured to perform arbitration processing on the received request for accessing the TCM RAM, and send the request after the arbitration processing to the TCM RAM;

The response sub-module 326 is configured to process data returned by the TCM RAM and the Cache RAM, complete a read operation and/or a write operation of the data, and return data and a response;

The configuration module 31 is further configured to: restore the TCM RAM to a Cache RAM, and transfer data in the TCM RAM to a memory.

In the embodiment of the present invention, the configuration module 31 configures the Cache RAM as TCM RAM when the system requires TCM RAM according to actual needs; when the system no longer needs TCM RAM, the TCM RAM can be restored to Cache. RAM; when the Cache RAM is configured as TCM RAM, the data in the Cache RAM can be flushed to the memory; when the TCM RAM is restored to the Cache RAM, the data in the TCM RAM can be transferred to the memory, thereby Keep data consistent.

The implementation functions of the respective processing modules in the memory switching device shown in FIG. 3 and can be understood by referring to the related description of the foregoing memory switching method. It should be understood by those skilled in the art that the functions of the processing modules in the memory switching device shown in FIG. 3 can be implemented by a program running on the processor, or can be implemented by a specific logic circuit, for example, by a central processing unit ( CPU), microprocessor (MPU), digital signal processor (DSP), or field programmable gate array (FPGA) implementation.

In the several embodiments provided by the present invention, it should be understood that the disclosed method and apparatus may be implemented in other manners. The device embodiments described above are merely illustrative. For example, the division of the modules is only a logical function division. In actual implementation, there may be another division manner, for example, multiple modules or components may be combined, or Can be integrated into another system, Or some features can be ignored or not executed. In addition, the communication connections between the various components shown or discussed may be indirect coupling or communication connections through some interfaces, devices or modules, and may be electrical, mechanical or otherwise.

The modules described above as separate components may or may not be physically separated. The components displayed as modules may or may not be physical modules, that is, may be located in one place or distributed to multiple network modules; Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional module in each embodiment of the present invention may be integrated into one processing module, or each module may be separately used as one module, or two or more modules may be integrated into one module; The module can be implemented in the form of hardware or in the form of hardware plus software function modules.

It will be understood by those skilled in the art that all or part of the steps of implementing the foregoing method embodiments may be performed by hardware related to program instructions. The foregoing program may be stored in a computer readable storage medium, and when executed, the program includes The foregoing steps of the method embodiment; and the foregoing storage medium includes: a removable storage device, a read-only memory (ROM), a magnetic disk or an optical disk, and the like, which can store program codes.

Alternatively, the above-described integrated module of the embodiment of the present invention may be stored in a computer readable storage medium if it is implemented in the form of a software function module and sold or used as a stand-alone product. Based on such understanding, the technical solution of the embodiments of the present invention may be embodied in the form of a software product in essence or in the form of a software product stored in a storage medium, including a plurality of instructions. A computer device (which may be a personal computer, server, or network device, etc.) is caused to perform all or part of the methods described in various embodiments of the present invention. The foregoing storage medium includes various media that can store program codes, such as a mobile storage device, a ROM, a magnetic disk, or an optical disk.

The memory switching method and apparatus described in the embodiments of the present invention are only exemplified by the above embodiments. However, it is not limited thereto, and those skilled in the art should understand that the technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or replacements are not The essence of the corresponding technical solutions is deviated from the scope of the technical solutions of the embodiments of the present invention.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Industrial applicability

The technical solution of the embodiment of the present invention can dynamically use the existing Cache RAM as a TCM, realize dynamic switching of the TCM and the Cache without increasing the RAM cost, and can simultaneously access the Cache RAM and the TCM RAM. Significantly increase data access speed and ensure data consistency.

Claims

A memory switching method, the method comprising:

Configuring the cache Cache RAM as a tightly coupled memory TCM RAM;

Determining the memory to be accessed by the received request, when the memory to be accessed by the received request is Cache RAM, generating a request to access the Cache RAM; when the received request is to access the memory type TCM RAM, generating access to the TCM RAM request;

The generated access request is sent to the corresponding RAM.
The method of claim 1 wherein said configuring the Cache RAM as a TCMRAM comprises:

Configure some of the Cache RAM as TCM RAM; or,

Configure all Cache RAM as TCM RAM.
The method of claim 1 or 2, wherein the configuring the Cache RAM as the TCM RAM comprises:

Change the allocation algorithm of Cache RAM, and do not query and allocate the Cache RAM to be configured as TCM RAM;

The Cache RAM that does not perform query and allocation establishes a one-to-one mapping of the TCM address space and the TCMRAM, and configures the Cache RAM as a TCM RAM.
The method of claim 3 wherein the method further comprises transferring data in the Cache RAM to be configured as TCM RAM to memory.
The method of claim 1 wherein the method further comprises restoring the TCM RAM to a Cache RAM and transferring data in the TCM RAM to memory.
A memory switching device, the device comprising: a configuration module and a control module, wherein

The configuration module is configured to configure the cache cache RAM as a tightly coupled memory TCM RAM;

The control module is configured to determine a memory to be accessed by the received request, when receiving When the memory to be accessed by the request is Cache RAM, a request for accessing the Cache RAM is generated; when the received memory type of the request is TCM RAM, a request for accessing the TCMRAM is generated; and the generated access request is sent to the corresponding RAM.
The apparatus of claim 6, wherein the configuration module is configured to: configure a portion of the Cache RAM as a TCM RAM; or configure the entire Cache RAM as a TCMRAM.
The apparatus according to claim 6 or 7, wherein said configuration module is configured to:

Change the allocation algorithm of Cache RAM, and do not query and allocate the Cache RAM to be configured as TCM RAM;

The Cache RAM that does not perform query and allocation establishes a one-to-one mapping of the TCM address space and the TCMRAM, and configures the Cache RAM as a TCM RAM.
The apparatus of claim 6 wherein said configuration module is further configured to: transfer data in said Cache RAM to be configured as TCM RAM to memory.
The apparatus of claim 6 wherein said configuration module is further configured to: restore said TCM RAM to Cache RAM and transfer data in said TCM RAM to memory.
A computer storage medium having stored therein computer executable instructions for performing the memory switching method of any one of claims 1 to 5.