CN116306757A - Memory card type identification method - Google Patents

Abstract

A memory card type identification method for identifying a type of a secure digital card having a pin number conforming to a secure digital card specification established by a secure digital conference, the method comprising: carrying out a traditional secure digital card initialization program on the secure digital card; and sequentially judging whether the secure digital card is a secure digital express card, a second type of ultra-high speed secure digital card or a traditional secure digital card.

Description

Memory card type identification method

technical field

The invention relates to a secure digital (Secure Digital, SD) memory card, in particular to a card reading device for the SD card, an electronic device and a method for identifying the type of the SD card.

Background technique

At present, there are three types of secure digital memory cards that are more common: traditional SD card (legacy SD card), SD card that supports Peripheral Component Interconnect Express (PCIe interface) (hereinafter referred to as PCIe interface) (that is, SD Express (SD card) SD Express) card) and SD cards that support the second type of Ultra High Speed (Ultra High Speed type II, UHS-II) interface (hereinafter referred to as UHS-II interface) (hereinafter referred to as UHS-II SD card). Both SD Express cards and UHS-II SD cards are backward compatible with traditional SD cards. However, since the SD Express card and the UHS-II SD card are identical in signal contact point arrangement, the PCIe interface is an AC (Alternating Current, AC) coupled interface and the UHS-II interface is a DC (Direct Current, DC) coupled interface Interface, so it is not easy to identify SD Express card and UHS-II SD card, causing users a lot of inconvenience. Furthermore, if the card reader needs to support the traditional SD card at the same time, it is a big challenge to identify the type of the memory card.

Therefore, a method for identifying the type of SD card is needed.

Contents of the invention

In view of the deficiencies of the prior art, an object of the present invention is to provide a method for identifying the type of an SD card to improve the deficiencies of the prior art.

An embodiment of the present invention provides a memory card type identification method for identifying the type of a secure digital card. The pin number of the secure digital card follows a secure digital card specification formulated by the Secure Digital Association. The method includes: performing one of a Type 2 Ultra High Speed Secure Digital Card initialization procedure and a Secure Digital Express Card initialization procedure on the Secure Digital card; controlling a number 4 pin of the Secure Digital card to be substantially 0 volts; controlling the Secure Digital A number 14 pin of the digital card is at substantially 0 volts; performing the other of the Type 2 Ultra High Speed Secure Digital Card initialization procedure and the Secure Digital Express card initialization procedure on the Secure Digital card; and, determining the Secure Digital Whether the card is a Class 2 SuperSpeed Secure Digital card or a Secure Digital Express card.

Another embodiment of the present invention provides a method for identifying the type of memory card, which is used to identify the type of a secure digital card. The pin number of the secure digital card follows a secure digital card specification formulated by the Secure Digital Association. The method includes : Carrying out a conventional SD card initialization program on the SD card; and, sequentially judging whether the SD card is a SD Express card, a Type 2 ultra-high speed SD card or a traditional SD card.

Another embodiment of the present invention provides a method for identifying the type of memory card, which is used to identify the type of a secure digital card. The pin number of the secure digital card follows a secure digital card specification formulated by the Secure Digital Association. The method includes : Carry out a second-class ultra-high-speed secure digital card initialization program to the secure digital card; judge whether the secure digital card is a second-class ultra-high-speed secure digital card; In the case of a digital card, a number 4 pin controlling the secure digital card is substantially 0 volts, a number 14 pin controlling the secure digital card is substantially 0 volts, and a conventional secure digital card is applied to the secure digital card Initialization procedure; judging whether the SD card is a SD Express card; and, when the SD card is not the SD Express card, judging whether the SD card is a conventional SD card.

Compared with the prior art, the invented memory card type identification method can at least identify SD Express card, UHS-II SD card and traditional SD card.

The features, implementation and technical effects of the present invention are described in detail as follows with reference to the accompanying drawings.

Description of drawings

Fig. 1 is a functional block diagram of an embodiment of the electronic device of the present invention;

Figure 2 shows the pin numbers of the Secure Digital card;

Fig. 3 shows the flowchart of an embodiment of the memory card type identification method of the present invention;

Fig. 4 shows the flowchart of an embodiment of step S11 of Fig. 3;

Fig. 5 shows the flowchart of an embodiment of step S21 of Fig. 3;

Fig. 6 shows the flowchart of an embodiment of step S13 of Fig. 3;

Fig. 7 shows the flowchart of an embodiment of step S22 of Fig. 3;

Fig. 8 shows the flowchart of an embodiment of step S15 of Fig. 3;

Fig. 9 shows the flowchart of an embodiment of step S23 of Fig. 3;

Fig. 10 shows the flowchart of another embodiment of the memory card type identification method of the present invention;

Fig. 11 shows the flowchart of an embodiment of step S16 of Fig. 10;

Fig. 12 shows the flowchart of another embodiment of the memory card type identification method of the present invention;

Fig. 13 shows the flowchart of an embodiment of step S24 of Fig. 12;

Fig. 14 shows the flowchart of an embodiment of step S25 of Fig. 12;

Fig. 15 shows the flowchart of an embodiment of step S26 of Fig. 12;

Fig. 16 shows the flowchart of another embodiment of the memory card type identification method of the present invention; and

FIG. 17 shows a flowchart of an embodiment of step S27 in FIG. 16 .

Symbol Description

10A: Electronics

20: SD card

12: chip

C1, C2: capacitance

11A: Card reader device

18: Memory card slot

S0, S1, S2, S4, S5, S7: signal

P1, P3, P2, P4: pins

105: Select circuit

120: Control circuit

130: bridge card reader circuit

135: UHS-II physical layer

S3: Control signal

Pa, Pb: endpoint

S11, S12, S13, S14, S15, S16, S21, S22, S23, S24, S25, S26, S27, S31, S32, S33, S34, S35, S112, S114, S116, S118, S132, S134, S136, S138, S152, S154, S162, S164, S166, S212, S216, S218, S221, S223, S224, S225, S226, S227, S232, S234, S242, S244, S246, S252, S254, S262, S272, S2 74: step

Detailed ways

The technical terms in the following description refer to the customary terms in this technical field. If some terms are explained or defined in this manual, the explanations of these terms shall be based on the descriptions or definitions in this manual.

The disclosed content of the present invention includes a card reading device or an electronic device supporting multiple SD cards and a method for identifying the type of the SD card. Since some components included in the card reading device and electronic device of the present invention may be known components individually, so without affecting the full disclosure and implementability of the invention of the device, the details of the known components are described below will be omitted. In addition, part or all of the process of the method for identifying the type of SD card of the present invention can be in the form of software and/or firmware, and can be executed by the card reader device of the present invention or its equivalent device, without affecting the method of the invention Under the premise of full disclosure and practicability, the description of the method invention below will focus on the steps rather than the hardware.

FIG. 1 is a functional block diagram of an embodiment of the electronic device of the present invention. The electronic device 10A has a card reading function and can access the SD card 20 . The electronic device 10A includes a chip 12 , a capacitor C1 , a card reader 11A, a capacitor C2 and a memory card slot 18 . The card reading device 11A is coupled between the chip 12 and the memory card slot 18 . More specifically, the card reading device 11A is coupled to the chip 12 through the capacitor C1, and is coupled to the memory card slot 18 through the capacitor C2. The memory card slot 18 is used to receive the SD card 20 (ie, for the SD card 20 to be inserted).

One end of the capacitor C1 is coupled or electrically connected to the chip 12 , and the other end is coupled or electrically connected to the card reading device 11A. The capacitor C1 is used as an AC coupling (AC coupling) capacitor. When the transmission direction of the signal is from the chip 12 to the card reader 11A, the signal S0 between the chip 12 and the capacitor C1 includes AC and DC components, while the signal S1 between the capacitor C1 and the card reader 11A only includes the AC component , but does not include the DC component; when the signal transmission direction is from the card reader 11A to the chip 12, the signal S1 includes the AC component and the DC component, while the signal S0 only includes the AC component, but does not include the DC component. Because the PCIe signal is a signal transmitted through AC coupling, one of the purposes of the capacitor C1 is to provide a PCIe signal connection between the chip 12 and the card reader 11A, that is, to establish a connection between the chip 12 and the card reader 11A. PCIe interface.

One end of the capacitor C2 is coupled or electrically connected to the pin P1 of the card reading device 11A, and the other end of the capacitor C2 is coupled or electrically connected to the pin P3 of the memory card slot 18 . Capacitor C2 acts as an AC coupling capacitor. When the transmission direction of the signal is from the memory card slot 18 to the card reader 11A, the signal S5 between the pin P3 and the capacitor C2 includes an AC component and a DC component, while the signal S2 between the capacitor C2 and the pin P1 only includes The AC component, but does not include the DC component; when the transmission direction of the signal is from the card reader 11A to the memory card slot 18, the signal S2 may include the AC component and the DC component, while the signal S5 only includes the AC component, but does not Contains the DC component. It should be noted that when the signal transmitted between the pin P1 and the pin P3 is a PCIe signal, both the signal S5 and the signal S2 are PCIe signals.

The card reading device 11A further includes a pin P2 and a pin P4 . The pin P2 is coupled or electrically connected to the pin P3 , and the pin P4 is coupled or electrically connected to at least one pin (not shown) of the memory card slot 18 . When the SD card 20 is a traditional SD card, the card reading device 11A accesses the SD card 20 at least through the pin P4 (the signal S7 is a signal conforming to the standard of the traditional SD card, hereinafter referred to as the traditional SD card signal). When the SD card 20 is a UHS-II SD card (at this time, the signal S5 is a signal following the UHS-II SD card specification, hereinafter referred to as the UHS-II SD card signal), the card reading device 11A at least accesses the SD card through the pin P2 20, but the SD card 20 is not accessed through the pin P1. At this time, the pin P1 will become a sideband signal for auxiliary use, such as providing a clock or some control signals. When the SD card 20 is an SDExpress card (the signal S5 is an SDExpress card signal), the card reading device 11A at least accesses the SD card 20 through the pin P1, but does not access the SD card 20 through the pin P2.

In some embodiments, the chip 12, the capacitor C1, the capacitor C2, 11A, and the memory card slot 18 are arranged on a circuit board (not shown) of the electronic device 10A, and the above-mentioned signal S0, signal S1, signal S2, The signal S5 and the signal S7 are transmitted through the wiring on the circuit board or the wire.

The card reading device 11A includes a selection circuit 105 (such as a multiplexer (MUX)), a control circuit 120 and a bridge card reading circuit 130 . The control circuit 120 is coupled to the selection circuit 105 and the bridge reader circuit 130 for controlling the selection circuit 105 and the bridge reader circuit 130 .

The bridge reader circuit 130 can convert the traditional SD card signal (ie, the signal S7 ) into a PCIe signal (ie, the signal S4 ). The bridge reader circuit 130 includes a UHS-II physical layer 135 for converting a UHS-II SD card signal (such as signal S5 ) into a signal S4 . In other words, the bridge card reader circuit 130 is a bridge card reader circuit between a traditional SD card and a UHS-II SD card. The traditional SD card and UHS-II SD card bridge card reader circuit is well known to those skilled in the art, so the details will not be repeated. For the traditional SD card, you can refer to the SD Association website https://www.sdcard.org/downloads The Physical LayerSimplified Specification on /pls/; for the UHS-II part, you can refer to the UHS-II Simplified Addendum.

The selection circuit 105 receives the signal S2 and the signal S4. The control circuit 120 controls the selection circuit 105 through the control signal S3. When SD card 20 is SD Express card, control circuit 120 controls selection circuit 105 to select terminal Pa; An open circuit is formed between C1 and the bridge card reader circuit 130 (that is, no signal connection: signal S1≠signal S4). When the SD card 20 is a UHS-II SD card or a traditional SD card, the control circuit 120 controls the selection circuit 105 to select the endpoint Pb; that is, a path is formed between the capacitor C1 and the bridge card reader circuit 130 (signal S1=signal S4), And an open circuit is formed between the capacitor C1 and the pin P1 (signal S1≠signal S2).

当SD卡20是UHS-II SD卡时，芯片12通过以下的路径存取SD卡20：/>

当SD卡20是传统SD卡时，芯片12通过以下的路径存取SD卡20：/>

换言之，读卡装置11A支持多种SD卡的存取，而采用读卡装置11A的电子装置10A则具有多种SD卡的存取能力。When the SD card 20 is an SD Express card, the chip 12 accesses the SD card 20 through the following paths:

When the SD card 20 is a UHS-II SD card, the chip 12 accesses the SD card 20 through the following paths: />

When the SD card 20 is a traditional SD card, the chip 12 accesses the SD card 20 through the following paths: />

In other words, the card reading device 11A supports the access of various SD cards, and the electronic device 10A adopting the card reading device 11A has the access capability of various SD cards.

The chip 12 in FIG. 1 is connected or communicated with the card reader 11A through the PCIe interface; in other words, the setting of the capacitor C1 can make the signal transmission between the chip 12 and the card reader 11A conform to the PCIe specification. Therefore, in some embodiments, the capacitor C2 can be omitted to save cost or circuit area.

Figure 2 shows the pin numbers of Secure Digital cards (traditional SD cards, UHS-II SD cards, and SD Express cards). These pin numbers follow the Secure Digital Card specification developed by the Secure Digital Association. For a description of these pins and more details, please refer to the Physical Layer Simplified Specification on the SD Association website https://www.sdcard.org/downloads/pls/, in other words, the pins or signal names listed in Figure 2 ( For example, clock RCLK+/-, clock REFCLK+/-, signal PERST#, CLKREQ#, etc.) can be found in the SD card specification or related implementation details.

In the embodiment of FIG. 1 , the control circuit 120 communicates with the SD card 20 through pins P1, P2, P4 and/or other pins (not shown) of the card reading device 11A (including but not limited to transmitting/receiving clocks). , commands, data, etc.). For the sake of brevity, the connections between these pins and the control circuit 120 and the memory card slot 18 are omitted in FIG. 1 .

FIG. 3 shows a flow chart of an embodiment of the method for identifying the type of the memory card of the present invention. This process can be executed by the card reading device 11A, and includes the following steps.

Step S11: Perform a UHS-II SD card initialization procedure on the SD card 20 . The details of step S11 will be discussed in conjunction with FIG. 4 below.

Step S21: Determine whether the SD card 20 is a UHS-II SD card. If the judgment result is yes, go to step S31; otherwise, go to step S12. The details of step S21 will be discussed in conjunction with FIG. 5 below.

Step S31: continue with the UHS-II SD card initialization procedure (please refer to the Secure Digital Card Specification for details).

Step S12 : Control pin number 4 to be substantially 0V and control pin number 14 to be substantially 0V (that is, equivalent to turning off pin number 4 and pin number 14 ). Note that "substantially a certain voltage" means equal to or approximately the voltage.

Step S13: carry out the SD Express card initialization program on the SD card 20 . The details of step S13 will be discussed in conjunction with FIG. 6 below.

Step S22: Determine whether the SD card 20 is an SD Express card. If the judgment result is yes, go to step S32; otherwise, go to step S14. The details of step S22 will be discussed in conjunction with FIG. 7 below.

Step S32: continue with the SD Express card initialization procedure (please refer to the Secure Digital Card specification for details).

Step S14: Step S14 is the same as step S12.

Step S15: Carry out a traditional SD card initialization procedure on the SD card 20 . The details of step S15 will be discussed in conjunction with FIG. 8 below.

Step S23: Determine whether the SD card 20 is a conventional SD card. If the judgment result is yes, go to step S33; otherwise, go to step S34. The details of step S23 will be discussed in conjunction with FIG. 9 below.

Step S33: continue with the traditional SD card initialization procedure (please refer to the Secure Digital Card specification for details).

Step S34: The control number 4 pin is substantially 0V, because the SD card 20 is another type of memory card or not a memory card.

FIG. 4 shows a flowchart of an embodiment of step S11 in FIG. 3 , including the following steps.

Step S112 : Control pin number 4 to be substantially 3.3V.

Step S114: Control the pin number 14 to be substantially 1.8V.

Step S116: Control the pin number 1 to be substantially low voltage (for example, 0V). Please refer to FIG. 2 , since the Secure Digital Card specification does not define pin number 1 in UHS-II mode, pin number 1 can be high voltage or low voltage for UHS-II mode. However, for PCIe mode, when the number 1 pin (ie, PERST#) is low voltage, the SD Express card will not operate. Therefore, step S116 can prevent the SD Express card from being misjudged as a UHS-II SD card.

Step S118 : Control the number 9 pin, the number 2 pin and the number 5 pin to be substantially low voltage (for example, 0V). Please refer to Figure 2, since the Secure Digital Card specification does not define pins 9, 2 and 5 in UHS-II mode, these three pins can be high voltage for UHS-II mode or low voltage. Please note that in some embodiments, step S118 is optional.

FIG. 5 shows a flowchart of an embodiment of step S21 in FIG. 3 , including the following steps.

Step S212 : Simultaneously provide the clock RCLK+ to the pin number 7 and the clock RCLK- to the pin number 8 .

Step S216 : Provide the signal STB.L to the number 11 pin and the number 12 pin. Please refer to the Secure Digital Card Specification for the definition or implementation details of the signal STB.L.

Step S218: Determine whether the signal STB.L is detected at the number 15 pin and the number 16 pin. If the judgment result is yes, the control circuit 120 can determine that the SD card 20 is a UHS-II SD card; otherwise, the SD card 20 is not a UHS-II SD card.

FIG. 6 shows a flowchart of an embodiment of step S13 in FIG. 3 , including the following steps.

Step S132: Control pin 4 to be substantially 3.3V.

Step S134: Control pin number 18 to be substantially 1.2V.

Step S136: Control the pin number 9 to be substantially high voltage (for example, 3.3V).

Step S138: Control the pin number 1 to be substantially low voltage (for example, 0V).

FIG. 7 shows a flowchart of an embodiment of step S22 in FIG. 3 , including the following steps.

Step S221 : Simultaneously provide the clock RRFCLK+ to the number 7 pin and the clock RRFCLK- to the number 8 pin.

Step S223: Control the pin number 1 to a substantially high voltage (for example, 3.3V).

Step S224: Determine whether the number 9 pin is substantially low voltage (for example, 0V). If the judgment result is yes, the control circuit 120 can determine that the SD card 20 is an SD Express card; otherwise, execute step S225.

Step S225: Control the number 18 pin to be substantially 0V (that is, equivalent to turning off the number 18 pin).

Step S226: Control pin 14 to be substantially 1.8V.

Step S227: Determine whether the number 9 pin is substantially low voltage (for example, 0V). If the judgment result is yes, the control circuit 120 can determine that the SD card 20 is an SD Express card; otherwise, the SD card 20 is not an SD Express card.

FIG. 8 shows a flowchart of an embodiment of step S15 in FIG. 3 , including the following steps.

Step S152: Control pin 4 to be substantially 3.3V.

Step S154: Provide a clock to the pin number 5.

FIG. 9 shows a flowchart of an embodiment of step S23 in FIG. 3 , including the following steps.

Step S232: Send several SD commands to the SD card 20 via the number 2 pin.

Step S234: Determine whether the expected response is received. If the judgment result is yes, the control circuit 120 can determine that the SD card 20 is a conventional SD card; otherwise, the SD card 20 is not a conventional SD card.

In some embodiments, several SD commands and expected responses described above are described on page 36 of the Secure Digital Card Specification Version 7.10 (available here: www.sdcard.org/downloads/pls/archives/).

FIG. 10 shows a flow chart of another embodiment of the method for identifying the type of the memory card of the present invention. Fig. 10 is similar to Fig. 3, the difference is that the process of Fig. 10 first judges whether SD card 20 is an SD Express card, and then judges whether SD card 20 is a UHS-II SD card; therefore, please refer to the discussion of Fig. 3 to understand Fig. 10 detail. However, step S16 is slightly different from step S11, and the details of step S16 will be discussed in conjunction with FIG. 11 below.

FIG. 11 shows a flowchart of an embodiment of step S16 in FIG. 10 , including the following steps.

Step S162: Control pin 4 to be substantially 3.3V.

Step S164: Control pin number 14 to be substantially 1.8V.

Step S166 : Control the number 1 pin, the number 9 pin, the number 2 pin and the number 5 pin to substantially low voltage (for example, 0V). Please note that in some embodiments, step S166 is optional.

FIG. 12 shows a flow chart of another embodiment of the method for identifying the type of the memory card of the present invention. This process can be executed by the card reading device 11A, and includes the following steps.

Step S15: Carry out a traditional SD card initialization procedure on the SD card 20 . Details of step S15 are shown in FIG. 8 .

Step S24: Determine whether the SD card 20 is an SD Express card. If the judgment result is yes, go to step S32; otherwise, go to step S25. The details of step S24 will be discussed in conjunction with FIG. 13 below.

Step S32: continue with the SD Express card initialization procedure (please refer to the Secure Digital Card specification for details).

Step S25: Determine whether the SD card 20 is a UHS-II SD card. If the judgment result is yes, go to step S35; otherwise, go to step S26. The details of step S25 will be discussed in conjunction with FIG. 14 below.

Step S35 : the control number 4 pin is substantially 0V, and the UHS-II SD card initialization procedure is performed on the SD card 20 (please refer to the Secure Digital Card specification for initialization details).

Step S26: Determine whether the SD card 20 is a conventional SD card. If the judgment result is yes, go to step S33; otherwise, go to step S34. The details of step S26 will be discussed in conjunction with FIG. 15 below.

Step S33: continue with the traditional SD card initialization procedure (please refer to the Secure Digital Card specification for details).

Step S34: Same as step S34 in FIG. 3 .

FIG. 13 shows a flowchart of an embodiment of step S24 in FIG. 12 , including the following steps.

Step S242: Send the SD CMD0 command to the SD card 20 via the number 2 pin.

Step S244: Send the SD CMD8 command to the SD card 20 via the number 2 pin.

Step S246: Determine whether a CMD8 PCIe response is received. More specifically, this step is to determine whether the "PCIe response" field in the CMD8 PCIe response indicates that the SD card 20 is an SD Express card. If the judgment result is yes, the control circuit 120 can determine that the SD card 20 is an SD Express card; otherwise, the SD card 20 is not an SD Express card.

For SD CMD0 command, SD CMD8 command and CMD8 PCIe response, please refer to page 81 of All Digital Card Specification Version 7.10.

FIG. 14 shows a flowchart of an embodiment of step S25 in FIG. 12 , including the following steps.

Step S252 : Send the SD ACMD41 command to the SD card 20 via the number 2 pin.

Step S254: Determine whether the SD card 20 is in ACMD41 UHS-II SD card status. More specifically, this step is to determine whether the “UHS-II status” field in the response from the SD card 20 indicates that the SD card 20 is a UHS-II SD card. If the judgment result is yes, the control circuit 120 can determine that the SD card 20 is a UHS-II SD card; otherwise, the SD card 20 is not a UHS-II SD card.

For SD ACMD41 commands and ACMD41 UHS-II SD card status, please refer to page 39 of All Digital Card Specification Version 7.10.

FIG. 15 shows a flowchart of an embodiment of step S26 in FIG. 12 , including the following steps.

Step S262: Judging whether the CMD8 command and the ACMD41 command are received from the SD card 20. If the judgment result is yes, the control circuit 120 can determine that the SD card 20 is a conventional SD card; otherwise, the SD card 20 is not a conventional SD card.

FIG. 16 shows a flow chart of another embodiment of the method for identifying the type of the memory card of the present invention. This process can be executed by the card reading device 11A, and includes the following steps.

Step S11: Perform a UHS-II SD card initialization procedure on the SD card 20 . Details of step S11 are shown in FIG. 4 .

Step S21: Determine whether the SD card 20 is a UHS-II SD card. If the judgment result is yes, go to step S31; otherwise, go to step S12. Details of step S21 are shown in FIG. 5 .

Step S31: continue with the UHS-II SD card initialization procedure (please refer to the Secure Digital Card Specification for details).

Step S12 : the control number 4 pin is substantially 0V and the control number 14 pin is substantially 0V.

Step S15: Carry out a traditional SD card initialization procedure on the SD card 20 . Details of step S15 are shown in FIG. 8 .

Step S24: Determine whether the SD card 20 is an SD Express card. If the judgment result is yes, go to step S32; otherwise, go to step S27. Details of step S24 are shown in FIG. 13 .

Step S32: continue with the SD Express card initialization procedure (please refer to the Secure Digital Card specification for details).

Step S27: Determine whether the SD card 20 is a conventional SD card. If the judgment result is yes, go to step S33; otherwise, go to step S34. The details of step S27 will be discussed below with reference to FIG. 17 .

Step S33: continue with the traditional SD card initialization procedure (please refer to the Secure Digital Card specification for details).

Step S34: Same as step S34 in FIG. 3 .

FIG. 17 shows a flowchart of an embodiment of step S27 in FIG. 16 , including the following steps.

Step S272 : Send the SD ACMD41 command to the SD card 20 via the number 2 pin.

Step S274: Determine whether the SD card 20 responds to the SD ACMD41 command. If the judgment result is yes, the control circuit 120 can determine that the SD card 20 is a conventional SD card; otherwise, the SD card 20 is not a conventional SD card.

To sum up, the present disclosure also provides four kinds of memory card type identification methods ( FIG. 3 , FIG. 10 , FIG. 12 and FIG. 16 ). The device or circuit in FIG. 1 can use any one of the four methods to determine the type of the SD card 20 .

Although the foregoing embodiments take traditional SD cards, SD Express cards and UHS-II SD cards as examples, this is not a limitation of the present invention, and those skilled in the art can appropriately apply the present invention to other types of SD cards according to the disclosure of the present invention. storage card.

Because those skilled in the art can understand the implementation details and changes of the disclosed method invention through the disclosure content of the disclosed device invention, therefore, in order to avoid redundant text, the disclosure requirements and implementability of the method invention will not be affected. Under the premise, repeated descriptions are omitted here. Please note that the shapes, sizes and proportions of the elements in the foregoing illustrations are only illustrative, and are for those skilled in the art to understand the present invention, and are not intended to limit the present invention. In addition, in some embodiments, the steps mentioned in the aforementioned flow charts may be adjusted in sequence according to actual operations, and may even be executed simultaneously or partly simultaneously.

Although the embodiments of the present invention are as described above, these embodiments are not intended to limit the present invention, and those skilled in the art can make changes to the technical characteristics of the present invention according to the explicit or implicit contents of the present invention, all of which Changes may all belong to the scope of patent protection sought by the present invention. In other words, the scope of patent protection of the present invention must be defined by the claims in this specification.

Claims (10)

1. A memory card type identification method for identifying the type of a secure digital card whose pin number complies with a secure digital card specification established by a secure digital conference, the method comprising the steps of:

performing one of a second type of ultra-high speed secure digital card initialization procedure and a secure digital flash card initialization procedure on the secure digital card;

controlling a number 4 pin of the secure digital card to be substantially 0 volts;

a pin number 14 controlling the secure digital card is substantially 0 volts;

performing the second ultra-high speed secure digital card initialization procedure and the secure digital flash card initialization procedure on the secure digital card; and

and judging whether the secure digital card is a second ultra-high speed secure digital card or a secure digital express card.

2. The memory card type identification method as claimed in claim 1, wherein the step of performing the second type of ultra high speed secure digital card initialization procedure on the secure digital card comprises:

the number 4 pin controlling the secure digital card is substantially 3.3 volts; and

the pin number 14 controlling the secure digital card is substantially 1.8 volts.

3. The memory card type identification method of claim 1, wherein the step of determining whether the secure digital card is the second ultra-high-speed secure digital card comprises:

providing a first clock to a pin number 7 of the secure digital card;

providing a second clock to a pin number 8 of the secure digital card; and

providing signal stb.l to a pin number 11 and a pin number 12 of the secure digital card.

4. The memory card type identification method of claim 1, wherein the step of determining whether the secure digital card is the secure digital express card comprises:

providing a first clock to a pin number 7 of the secure digital card;

providing a second clock to a pin number 8 of the secure digital card;

controlling a number 1 pin of the secure digital card to be substantially a high voltage;

judging whether a pin number 9 of the secure digital card is substantially at a low voltage; and

when the pin number 9 of the secure digital card is substantially the low voltage, the secure digital card is determined to be the secure digital express card.

5. The memory card type identification method of claim 1, wherein when the secure digital card is not the second ultra-high speed secure digital card and is not the secure digital express card, the steps of:

the number 4 pin controlling the secure digital card is substantially 0 volts;

the number 14 pin controlling the secure digital card is substantially 0 volts;

carrying out a traditional secure digital card initialization program on the secure digital card; and

and judging whether the secure digital card is a traditional secure digital card or not.

6. The memory card type identification method of claim 5, wherein the step of determining whether the secure digital card is the legacy secure digital card further comprises:

transmitting a plurality of commands to the secure digital card; and

judging whether an expected response is received or not;

and when the expected response is received, judging that the secure digital card is the secure digital card.

7. A memory card type identification method for identifying the type of a secure digital card whose pin number complies with a secure digital card specification established by a secure digital conference, the method comprising the steps of:

carrying out a traditional secure digital card initialization program on the secure digital card; and

and judging whether the secure digital card is a secure digital express card, a second ultra-high speed secure digital card or a traditional secure digital card in sequence.

8. The memory card type identification method of claim 7, wherein the step of determining whether the secure digital card is the secure digital express card comprises:

sending an SD CMD0 command to the secure digital card; and

sending an SD CMD8 command to the secure digital card.

9. A memory card type identification method for identifying the type of a secure digital card whose pin number complies with a secure digital card specification established by a secure digital conference, the method comprising the steps of:

carrying out a second ultra-high speed security digital card initializing program on the security digital card;

judging whether the secure digital card is a second ultra-high speed secure digital card;

when the secure digital card is not the second ultra high speed secure digital card, controlling a number 4 pin of the secure digital card to be substantially 0 volts, controlling a number 14 pin of the secure digital card to be substantially 0 volts, and performing a conventional secure digital card initialization procedure on the secure digital card;

judging whether the secure digital card is a secure digital express card or not; and

when the secure digital card is not the secure digital express card, determining whether the secure digital card is a conventional secure digital card.

10. The memory card type identification method of claim 9, wherein the step of determining whether the secure digital card is the secure digital express card comprises:

an ACMD41 command is sent to the secure digital card.

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