KR200330112Y1 - A Micro memory card - Google Patents

Abstract

The present invention is a type of micro-memory card with a wide range of uses, and has a specific common transfer interface. The common transfer interface is based on the USB standard. In addition to installing a USB interface lead, the data transfer lead is separately arranged to provide a USB interface. The D + and D- leads of the leads measure the system interface type into which the micro memory card is inserted for the initialization signal from the transmission system stage, and then switch to the corresponding working mode, which allows memory card systems of different specifications. The interface can proceed to transmit signals through this common transport interface and the micro memory card.

Description

Micro memory card

The present invention relates to a kind of redundantly recordable micro memory card, and more particularly to a redundant recordable micro memory card widely applied to a memory card system interface of various other standards.

In general, the development of small memory cards has a considerable market value, so each manufacturer has been competing with each other to produce its own specifications, hoping that the memory card specifications established by the company will be the main products of future memory cards. However, due to this phenomenon, currently available memory cards are not compatible with each other, and have different characteristics in interface, command book, data transfer agreement and control mode, etc. It caused a variety of confusion. This not only causes extreme inconvenience to consumers, but also increases the difficulty of developing new products for manufacturers such as information appliances, digital electronics, and computer peripherals.

In order to solve this problem, vendors have developed a type of switching device for a variety of memory cards, which features a single transmission through an integrated read / write insert groove that effectively matches a single memory card size, size and circuit. An interface, for example, a USB, IEEE1394, PCMCIA, CF interface, and a computer system stage are connected and used for data transfer. However, this device does not have a storage function, so it is only used for the switching connection for data transfer of a memory card, and cannot be directly used for a device such as a digital camera, PDA or IA.

Therefore, if there is a memory card that matches the interface specifications, transmission agreements and circuits of the existing various memory cards, it will be possible to connect and apply to computer systems and various devices without using expensive switching devices. In other words, how to overcome the difficulties and inconveniences of users who access and use computers with different standards and expensive switching devices of various memory cards has been a problem.

The main purpose of the present invention is to allow a wide range of micro-memory cards to be used for system interfaces, such as SD and MS series, in addition to self-developed system interfaces, currently available commercially available memory card system interfaces.

Another object of the present invention is to allow this wide range of micro-memory cards to be used in the USB system interface, the current standard peripheral interface.

In order to reach the above-mentioned purposes and functions, the micro-purpose memory card of the present invention has one common transmission interface, and the signal transmission as the common transmission interface between the memory card system interface and the micro memory card of different specifications is achieved. Proceed with the transfer. The establishment of the common transfer interface is a memory card established on the basis of the USB standard. The installation includes a USB interface lead, and at least one data transfer lead must be arranged separately.

In addition to being newly enacted at the transmission interface, the micro-memory card for a wide range of uses is also modified and improved. Among them, the internal arrangement of the micro memory card is a kind of flash memory. In that characteristic,

By using the D + and D-interface leads of the USB interface, several initialization signals transmitted from the memory card system interface are transmitted, and are connected to the interface measurement / switching circuit of the common transmission interface and automatically measure the potential change of the initialization signal. Determine the type of the memory card system interface in which the micro memory card exists, and switch the signal transmission line based on this, so that the microcontroller corresponds to the memory card system interface based on the measurement result of the interface measurement / switching circuit. Mode is supported, and at the same time it processes signals from different transmission lines based on this working mode.

By the above-described design, the micro memory card of the present invention not only supports other existing memory card system interfaces by electrical interface, instruction book, data transfer agreement inside the micro memory card, but also other conventional memory card systems in terms of the mechanism size of the interface. It is compatible with the interface, which makes it a versatile micro memory card.

Hereinafter, with reference to the drawings will be described in detail the configuration and other features of the subject innovation.

1 is a symbol, signal name, and attribute table of a USB / MS series / SD interface lead position.

Figure 2 is a lead position check table of the present invention micro memory card and other system interface standards

3 is a lead arrangement diagram of a USB interface.

Figure 4 is a lead arrangement of the micro memory card of the present invention.

5 to 7 are flowcharts when system interfaces such as USB, MS series, SD, etc. transmit initialization signals, respectively.

8 is a circuit block diagram of a micro memory card according to the present invention;

<Explanation of symbols for main parts of drawing>

8: Micro memory card 81: Public transfer interface

82: interface measurement / switch circuit 821: measurement circuit

822: switching circuit 83: microcontroller

84: joining line 841: control signal joining line

842 ： Data merge line 85 ： Power switching / protection circuit

86: Flash memory 87: Buffer

The micro-purpose memory card of the present invention is the most widely used in the MS (Memory Stick) series (hereinafter referred to as MS), SD (Secure Digital (SD)) memory card, and peripheral devices which are most used on the market. Matching and designing the most common and basic USB interface, it supports memory card systems of different specifications.

Referring to FIG. 1, the code, signal names, and attribute tables of the USB / MS series / SD interface leads are shown. Although none of these interfaces have the same number of leads (USB interface is 4-lead interface / MS Series interface is 10-lead interface / SD interface is 9-lead interface), but as the table shows, In many ways the properties have the same lead position. For example, power leads (VCC / VDD), ground leads (VCC), four pairs of data transfer leads (D0-D3) and clock signals (CLK). GND), and the most basic D + and D-leads for data signal transmission. The micro-memory card of the present invention is based on the USB interface standard with the minimum number of leads, and again requires MS series / SD interface. The data transfer lead forms a common transmission interface, and memory card system interfaces of different standards (e.g., MS series / SD series interfaces) transmit signals to and from the micro memory card through the common transmission interface. Proceed.

Referring to FIG. 2, this is a comparison table of the micro-memory card read position standard and the other three types of system interface standard for the present invention. As can be seen in Figures 1 and 2 above, the MS series and SD interfaces can be connected to D0 by arranging four pairs of leads using the standard USB interface (see Figure 3) back into four pairs of leads, with proper placement and matching. , The data transfer lead positions D1, D2, and D3 (see FIG. 4), the micromemory card of the present invention supports the electrical interface required by the three types of interface systems described above.

Among them, the power plus pole lead (VCC) of the USB interface and the power plus pole (VCC / VDD) of the other interface are common, and the power minus pole (GND) of the USB interface and the power minus pole (VSS) of the other interface are common. Note that the INS insertion card in the sixth lead position of the MS series system interface measures the signal and supplies the system stage a signal measuring the system interface insertion of the micro memory card. For this reason, the micro memory card terminal may be directly connected to the negative terminal of the power supply and grounded. In the present invention, the sixth lead may be regarded as VSS and may be shared with other lead positions.

In addition to the common leads described above, the D + and D-lead positions of the USB interface can be changed to the multi-signal leads MF1 and MF2, which are capable of receiving signals of corresponding attributes based on different transfer agreements of the memory card system interface. send. In short, depending on what system interfaces are supported at the time, the signals are transmitted in signal modes with different properties, such as control signals or data signals. Taking the above three types of system interfaces as an example, if the micro-memory card of the present invention is inserted into the USB system interface, the MF1 switches and transmits the D + signal, and the MF2 switches and transmits the D- signal. When the micro memory card of the present invention is inserted into the MS series system interface, the MF1 switches to transmit the CLK signal, and the MF2 switches to transmit the BS signal. If the micro memory card of the present invention is inserted into the SD system interface, the MF1 Switches to transmit the CLK signal, and MF2 switches to transmit the CMD signal. Using these two leads, one can measure the type of system interface and send signals with different properties to different system interfaces.

Hereinafter, a method of measuring a system interface type with respect to the signals transmitted by the two reads MF1 and MF2 will be described. The measured signal is an initialization signal transmitted by the system interface to the micro memory card when the micro memory card is inserted into the system interface.

5 to 7, this is a flowchart when a system interface such as USB, MS series, SD, etc. transmits an initialization signal.

According to FIG. 5, when the micro memory card is inserted into the USB system interface, the MF2 generates a change in the lead D- signal line belonging to the USB, that is, maintains a low potential, and the MF1 generates a change in the D + signal line belonging to the USB. That is, it rises to a high potential of about 100 ms, descends to a low potential of 10 ms, and then rises again to a high potential.

According to FIG. 6, when the micro memory card is inserted into the MS series system interface, the MF2 generates a change in the lead CLK signal line belonging to the MS series, that is, the system stage receives a vibration signal generated, and the MF1 receives the vibration signal generated from the MS series. A change in the BS signal line is generated, i.e., maintained at a low potential state.

According to Fig. 7, when the micro memory card is inserted into the SD series system interface, the MF2 generates a change in the lead CLK signal line belonging to the SD series, that is, the system stage receives the vibration signal generated, and the MF1 receives the SD series belonging to the SD series. A change in the CMD signal line is generated, that is, maintained at a high potential state.

As described above, the micro-purpose memory card proposed by the present invention has a newly defined MF1 lead (originally, a USB interface) when inserted into the system interface as a common transmission interface in its internal circuit. It accepts the initialization signal transmitted by the system based on the D + lead belonging to it and the MF2 lead (originally, the D- lead belonging to the USB interface), and simultaneously measures the change of the initialization signal, thereby inserting the micro memory card. Determine the type of system interface.

Referring to FIG. 8, this is a block diagram of an internal circuit of a micro memory card according to the present invention.

The wide range of micro memory cards 8 has at least one common transmission interface 81, one interface measuring / switching circuit 82, and a microcontroller 83, the internal arrangement of which is one flash memory. There are 86.

Among them, the common transmission interface 81 is established based on the USB standard, and the arrangement includes USB interface leads such as VCC, GND, MF1 (i.e., D +), and MF2 (i.e., D-). At least one data transfer lead D0, D1, D2, D3 is arranged. In addition, as shown in the above-described embodiment, the MF1 (i.e., D +) and MF2 (i.e., D-) interface leads are used to transmit the initialization signals transmitted from the memory card system interface of the external connection.

The interface measuring / switching circuit 82 is composed of a measuring circuit 821 and a switching circuit 822, and is connected to the MF1 and MF2 interface leads of the common transmission interface 81, which measures the initialization signal. The potential change is automatically measured to determine the type of the memory card system interface present in the micro memory card 8, and the switching circuit 822 switches the signal transmission line based on the measurement result.

The microcontroller 83 switches the operation mode corresponding thereto to support the memory card system interface based on the measurement result of the interface measurement / switch circuit 82. For example, it switches to SD work mode, MS series work mode or USB work mode, and processes the signals transmitted by different transmission lines based on these work modes.

In addition, one data confluence line 842 and one control signal confluence line 841 are also arranged in the micro-memory card 8 for the wide purpose, and are connected to the interface measurement / conversion circuit 82, At the same time, signals are transmitted to the microcontroller 83 through the buffer 87 to transmit signals of different attributes. For example, the data confluence line 842 carries the D + and D- signals of the USB system interface, and the D0-D3 signals of the MS series and SD series system interfaces, and the control signal confluence line 841 is the MS series and SD series. Transmit signals such as CLK, BS, and CMD on the interface.

In the above-described three types of system interfaces, the measurement circuit 821 switches the switching circuit 822 to the transmission line when the power supply of the system stage is activated, and the initialization signal transmitted by the MF2 is a low potential signal. To switch to the data confluence line 842 and transmit the measurement result to the microcontroller 83, whereby the microcontroller 83 switches to the USB working mode.

If the initialization signal transmitted by the MF1 is a high potential signal when the system stage power is operated, the measuring circuit 821 commands the switching circuit 822 to switch to the transmission line and sends it to the control signal joining line 841. At the same time, the results are sent to the microcontroller 83, whereby the microcontroller 83 switches to the SD working mode.

If the initialization signal transmitted by the MF1 is a low potential signal when the system stage power is activated, the measuring circuit 821 commands the switching circuit 822 to switch to the transmission line and sends it to the control signal joining line 841. At the same time, the results are sent to the microcontroller 83, whereby the microcontroller 83 switches to the MS working mode.

In this way, the microcontroller 83 processes the signal transmitted from the system end according to the different instruction book, data transfer agreement and control mode based on this working mode.

According to the design of the above-described embodiment, the type of system interface is automatically measured by the interface measurement / switch circuit 82, and then transmitted to the microcontroller 83 by the measurement result. However, by changing the program number inside the microcontroller 83, the above-described interface measurement / switch circuit 82 is also used for the measurement of whether the initialization signal is input and the transmission line of the switching signal. In addition, the microcontroller 83 receives and discriminates the potential change of the initialization signal, determines the type of the memory card system interface in which the micro memory card 8 exists, and corresponds to the corresponding working mode supported by the memory card system interface. In this operation mode, the signal is transmitted from different transmission lines, and the circuit is applied more smoothly.

In addition to the circuit arrangement described above, the micro memory card 8 includes a power switching / protection circuit 85, which is a power supply lead VCC and GND belonging to the original USB interface, thereby providing power transmitted by different system interfaces. It is converted into a power supply voltage applied to the internal circuit of the micro memory card 8 and used for stabilization and protection of the voltage.

The foregoing description is provided as an example of a preferred embodiment of the present invention and is merely illustrative of the inventive objects, features and effects of the present invention, and is best understood by those skilled in the art based on the principles described above. Since various changes and changes can be made without departing from the spirit and scope, it is to be understood that all changes and changes belonging to the spirit and scope of the new concept of the present invention are within the scope of the present invention.

Claims (5)

It has a specific common transmission interface 81, which is based on the USB standard, and in addition to installing USB interface leads (D + and D-), arranges data transmission leads separately. The memory card system interface of the different standard through the common transmission interface 81 and the micro memory card (8) to transmit the signal through the micro memory card. 2. The micro memory card of claim 1 wherein the memory card system interface comprises a USB and SD, MS series or other memory card system interface of different specifications. It has a specific common transmission interface 81, one side of which is connected with the internal circuitry of the micro memory card 8, and the other side, in combination with a switched connection interface of a predetermined standard, for the micro memory card. (8) can also be used for a memory card system interface of any specification, wherein the interface specification of the common transfer interface 81 is based on the USB specification, and the installation of USB interface leads (D + and D-) is provided. In addition, a micro memory card for separately placing data transfer leads (D0-D3). A micro memory card in which one flash memory 86 is disposed therein, One common transmission interface 81 is established based on the USB standard, and at least one data transmission lead D0-D3 is disposed in addition to the USB interface leads D + and D-, and the USB interface is arranged. The D + and D-interface leads of the M3 will transmit initialization signals from the memory card system interface of the external connection. One interface measuring / switching circuit 82 is composed of a measuring circuit 821 and a switching circuit 822, and is connected to the common transmission interface 81, which measures the potential change of the initialization signal. Automatic measurement, thereby determining the type of memory card system interface present in the micro memory card 8, and the switching circuit 822 switches the signal transmission line based on the measurement result, One microcontroller 83 switches to a working mode corresponding to the memory card system interface based on the measurement result of the interface measuring / switching circuit 82, and different transmission lines are based on these working modes. A micro memory card that processes the signals it transmits. A micro memory card in which one flash memory 86 is disposed therein, One common transmission interface 81 is established on the basis of the USB standard, and at least one data transmission lead D0-D3 is disposed in addition to the USB interface leads D + and D-. The D + and D- interface leads of the module transmit the initialization signals sent from the memory card system interface of the external connection. One interface measuring / switching circuit 82 is composed of a measuring circuit 821 and a switching circuit 822. The interface measuring / switching circuit 82 is connected to the common transmission interface 81. The measuring circuit 821 determines whether an input signal is inputted. Measurement, the switching circuit 822 is used to switch the transmission line of the signal, One microcontroller 83 is connected to the interface measuring / switching circuit 82 to receive and determine the potential change of the initialization signal and to switch to the working mode corresponding to the micro memory card system interface, and at the same time based on this working mode. A micro memory card that processes signals transmitted by different transmission lines.