CN107315699B - TF card - Google Patents

Abstract

The invention discloses a TF card, which is characterized in that at least one part of address space is divided in the logic address space of the TF card to be used as an extended function command, and the extended function command accesses the TF card according to the format of a normal read-write command; a remapping module is added in the TF card and used for analyzing whether the normal read-write command is an extended function command or not, and if so, the TF card is triggered to execute an operation command according to a preset extended function command; if not access to the TF card data space is required according to the command. By adding the Mapping module and the two data channels, not only are various functions specified in the original protocol compatible, but also the security of data access is improved, and the convenience of adding new functions is increased.

Description

TF card

Technical Field

The invention relates to the field of storage equipment, in particular to a TF card.

Background

The current TF card Host uses the LBA to access the data of the TF card, and the LBA is increased linearly in one dimension; such an access method has several problems as follows: 1. the LBA is 32bit and the data unit corresponding to the LBA is 512bytes, which means that Host can access 2T data at maximum, but there is no TF Card with such large capacity in practical application, so that a considerable part of the LBA is invalid, and when Host tries to access the LBA, the Card returns an error; 2. it is expected that the data on the Card will be the same, i.e. the same LBA read and write must be the same data, which makes it simple to steal the data on the BUS.

Meanwhile, when the TF card needs to expand functions, a command is often required to be added; however, since the Command has a limited length, the number of commands has an upper limit, and thus, the complexity of firmware increases only by adding commands to different clients, and it is not easy to rapidly develop and manage firmware versions.

Disclosure of Invention

Aiming at the defects, the invention aims to conveniently realize the extended function command of the TF card with the extended standard.

The invention provides a TF card for solving the problems, which is characterized in that at least one part of address space is divided in the logic address space of the TF card to be used as an extended function command, and the extended function command accesses the TF card according to the format of a normal read-write command; a remapping module is added in the TF card and used for analyzing whether the normal read-write command is an extended function command or not, and if so, the TF card is triggered to execute an operation command according to a preset extended function command; if not access to the TF card data space is required according to the command.

The TF card is characterized in that the remapping module at least comprises a policy table stored by a nonvolatile memory, the policy table is configured online or stored in advance through a host, and the policy table at least comprises information of an extended function command.

The TF card is characterized in that the remapping module analyzes whether the normal read-write command is an extended function command or not through an analysis state machine, and specifically comprises the following steps: and searching and matching the logic address information of the transmitted normal read-write command in the policy table through the analysis state machine, identifying a corresponding extended Function command if the logic address information of the transmitted normal read-write command is matched with the logic address information of the transmitted normal read-write command, and transmitting the extended Function command to the Function processing module Function of the TF card.

The TF card is characterized in that a Controller of the TF card receives an instruction of a host, directly issues a functional command which accords with a standard protocol of the TF card in the instruction to a functional processing module Function, and issues the instruction which possibly contains an extended functional command to a remapping module Mapping.

The TF card is characterized in that the Controller is realized by software or hardware; parameter passing is performed through a register group or FIFO when being realized through hardware.

The TF card is characterized in that the parsing state machine at least comprises: idle state Idle, Dispatch state Dispatch, Switch state Switch, configuration state Configure, and Process state Process.

The TF card, wherein the policy table at least includes: command index Command, Start logical address Start LBA, End logical address End LBA, extended function Command indexes Functions, and toggle Command Switch Command.

The invention not only is compatible with each function specified in the original protocol, but also improves the safety of data access and increases the convenience of adding new functions by adding the Mapping module and two data channels.

Drawings

FIG. 1 is a schematic diagram of the internal components and data path of a TF card;

FIG. 2 is a schematic diagram of the Mapping module;

FIG. 3 is a schematic diagram of the components of a resolution state machine.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 is a schematic diagram of internal components and data paths of a TF card, in which a Controller: processing related tasks of the external bus protocol of the TF card, and responding to a Host to send a command; receiving and transmitting Host request information; translating the Host command; and transmitting and receiving data through the SD Bus. Function: the method is used for realizing the functions defined in the protocol and the user requirements, and comprises function commands and extended function commands which accord with the TF card standard. Newly added Mapping: and mapping between the Command + LBA and user data space, system space, user-defined function and user requirements is realized. NandFlash: for storing user data. Systemespace: and the system inner space is used for storing system related data.

The TF card comprises 5 data paths: channel 1, Channel 2, Channel 3, Channel 4 and Channel 5. Wherein: channel 1: controller translated commands and data channels. This channel is compatible with the LBA base usage defined in the standard TF card protocol (also known as the SD protocol). Channel 2: the Controller translates the command and data channel, which is the command data channel defined in the protocol for reading and writing non-user data. Channel 3: after Mapping, a command data channel processed by the Function module is required to be handed over. Channel 4: and accessing a command data channel of NandFlash after Mapping. Channel 5: the Function module needs to access the command data channel of the SystemSpace.

FIG. 2 is a schematic diagram of the Mapping module; FIG. 3 is a schematic diagram of the components of a resolution state machine.

The Command and logical address Command index Command and LBA are Command information and related LBA information after the Controller receives and parses the host Command. The Command Index Command Index does not exceed the specified range of the SD protocol, but can define the function by itself under the condition of good agreement; LBA ranges are as defined by the SD protocol. This module can be implemented using software or hardware: for a hardware implementation, a register can be used for data transfer, and a FIFO can also be used for data transfer.

Strategy Table policy Table: wherein, at least one Default strategy Default string strategy is stored for configuring the strategy table of the user; and when the corresponding table entry cannot be found in the policy table, processing according to the SD protocol. This table should be implemented using a non-volatile storage medium, such as norflash, nandflash, tcam (ternary content addressable memory), etc. The policy table includes, but is not limited to, the following: command index Command, Start LBA, End LBA, extended function Command indexes Functions, and Switch Command.

The Core-Logic analysis module is a module of the Mapping module. The module is used for analyzing the relation between the Command indexes Command and LBA and Strategy Table, and outputting the extended function Command indexes Functions and data and the Operation and data information for processing and interacting with Nand Flash. This module needs to implement but is not limited to the following functions: the system comprises a parsing state machine, a policy table index logic and a policy arbitration logic.

The resolution state machine entity includes, but is not limited to, an Idle state Idle, a Dispatch state Dispatch, a Switch state Switch, a configuration state Configure, and a Process state Process.

Idle state Idle:

entry conditions were as follows: the TF card is powered on and,

internal operation: polling the module for transferring the Command index Command and LBA parsed by the Controller,

and (3) exit conditions: obtaining Command index Command and LBA analyzed by a Controller, and entering a scheduling state Dispatch;

dispatch status Dispatch:

entry conditions were as follows: idle state and Command index Command and LBA information,

internal operation: invoking policy table index logic to search relevant policy table entries, invoking policy arbitration logic to select to use the policy table entries,

and (3) exit conditions: entering a configuration state configuration without table matching, or entering a switching state Switch if the matched table needs to be switched in function, or entering a processing state Process if the matched table does not need to be switched in function;

switching state Switch:

entry conditions were as follows: dispatch status and extended function command index Functions numbers,

internal operation: configuring the relevant soft and hard modules according to the Functions number and the command carrying data,

and (3) exit conditions: receiving a Command index Command defined in a strategy table entry;

process status Process:

entry conditions were as follows: the matching table entries do not require a function switch,

internal operation: according to the command carrying data and the corresponding table item description function, the relevant operation is carried out,

and (3) exit conditions: the operation is complete. The policy table indexing logic implements, according to the difference of the policy table storage medium, the following modes including but not limited to:

1. if the policy table storage medium is NorFlash or NandFlash, the contents of the table entry need to be partially or completely copied into the memory, and then the search and the search are carried out by using a software mode or a hardware mode.

2. The storage medium of the policy table is TCAM, and the TCAM can carry out content matching search without developing a software algorithm.

Implementation of policy arbitration logic includes, but is not limited to, the following:

1. a first lookup match is used. The arbitration logic always uses the table entry obtained by the first search to perform corresponding processing.

2. The latest configuration table entry is used. The arbitration logic always uses the newly configured entry for corresponding processing.

3. The history table entry is used. The arbitration logic needs to record the past arbitration result once or many times, and compare the search results, and select the past commonly used performance to perform corresponding processing.

Functions and data: and if the result after the Core-Logic analysis shows that a Function module is required to carry out the residual processing, the Core-Logic organizes the Functions and the data information and sends the Functions and the data information to the Function module.

While the invention has been described with reference to a particular embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (6)

1. A TF card is characterized in that at least one part of address space is divided in the logic address space of the TF card to be used as an extended function command, and the extended function command accesses the TF card according to the format of a normal read-write command; a remapping module is added in the TF card and used for analyzing whether the normal read-write command is an extended function command or not, and if so, the TF card is triggered to execute an operation command according to a preset extended function command; if not, accessing the TF card data space according to the command requirement; the remapping module at least comprises a policy table stored by a nonvolatile memory, the policy table is configured on line or stored in advance by a host, and the policy table at least comprises information of an extended function command; the remapping module analyzes whether the normal read-write command is an extended function command through an analysis state machine, and specifically comprises the following steps: and searching and matching the logic address information of the transmitted normal read-write command in the policy table through the analysis state machine, identifying a corresponding extended Function command if the logic address information of the transmitted normal read-write command is matched with the logic address information of the transmitted normal read-write command, and transmitting the extended Function command to the Function processing module Function of the TF card.

2. The TF card of claim 1, wherein the Controller of the TF card receives the commands from the host, directly issues the functional commands meeting the standard protocol of the TF card to the functional processing module Function, and issues the commands containing the extended functional commands to the remapping module Mapping.

3. The TF card of claim 2, wherein the Controller is implemented by software or by hardware; parameter passing is performed through a register group or FIFO when being realized through hardware.

4. TF card according to any of the claims 1 to 3, characterized in that said resolution state machine comprises at least: idle state Idle, Dispatch state Dispatch, Switch state Switch, configuration state Configure, and Process state Process.

5. The TF card of claim 4 wherein the policy table includes at least: command index Command, Start logical address Start LBA, End logical address End LBA, extended function Command indexes Functions, and toggle Command Switch Command.

6. The TF card of claim 5 wherein the states of the parsing state machine are specifically defined as follows:

idle state Idle:

entry conditions were as follows: the TF card is powered on and,

internal operation: a module for polling the Command index Command and the logical address LBA resolved by the transfer Controller,

and (3) exit conditions: obtaining a Command index Command and a logic address LBA analyzed by a Controller, and entering a Dispatch state;

dispatch status Dispatch:

entry conditions were as follows: idle state and Command index Command and logical address LBA information,

internal operation: invoking policy table index logic to search relevant policy table entries, invoking policy arbitration logic to select to use the policy table entries,

and (3) exit conditions: entering a configuration state configuration without table matching, or entering a switching state Switch if the matched table needs to be switched in function, or entering a processing state Process if the matched table does not need to be switched in function;

switching state Switch:

entry conditions were as follows: dispatch status and extended function command index Functions numbers,

internal operation: configuring the related soft and hard modules according to the extended function command index Functions number and the command carrying data,

and (3) exit conditions: receiving a Command index Command defined in a strategy table entry;

process status Process:

entry conditions were as follows: the matching table entries do not require a function switch,

internal operation: according to the command carrying data and the corresponding table item description function, the relevant operation is carried out,

and (3) exit conditions: the operation is complete.

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