KR20060057794A - Apparatus and method for recognize insert of multi-media-card in portable terminal - Google Patents

Abstract

The present invention relates to an apparatus for recognizing the insertion of a memory card in a portable terminal, using an interrupt generator for generating an interrupt signal, a pull-up resistor included in the interrupt generator, and using the received interrupt signal. And a control unit for recognizing whether the memory card is inserted. Since the present invention recognizes that the memory card is inserted by receiving an interrupt signal, the burden on the controller is reduced compared to the polling method of periodically checking the insertion of the memory card.

Multimedia Cards, Polling, Interrupts, Pullup Resistors

Description

Apparatus and method for recognizing the insertion of a multimedia card in a portable terminal {APPARATUS AND METHOD FOR RECOGNIZE INSERT OF MULTI-MEDIA-CARD IN PORTABLE TERMINAL}             

1 is a diagram illustrating a configuration of an interface device to which a multimedia card is connected in a portable terminal according to the prior art; and

2 is a circuit diagram of a system for determining whether a multimedia card is inserted using a pull-up resistor in a portable terminal according to an exemplary embodiment of the present invention.

The present invention relates to an apparatus and method for recognizing insertion of a multimedia card (hereinafter referred to as MMC) in a portable terminal, and more particularly, to an apparatus and method for recognizing whether an MMC memory card is inserted using an interrupt method. It is about.

With the development of very large scale integration (VLSI) and computing technology, various types of small size terminals have been released to meet the trend of miniaturization of all products.

As the size of the terminal is reduced as described above, the interface method for connecting to the terminal is also becoming smaller. Therefore, as the interface schemes become smaller and smaller, various types of small cards have been produced. The MMC memory card is a kind of flash memory and has been developed in accordance with the trend of decreasing the size of the terminals.

1 shows a configuration of an interface device connected to a multimedia card in a portable terminal according to the prior art. With reference to FIG. 1, an operation for checking whether a multimedia card is inserted according to the prior art will be described. FIG. 1 uses an MMC memory card and a socket using 1 bit data (DATA0 of pin 7).

Referring to FIG. 1, an MMC memory card socket (MultiMediaCard-Socket) 100 is a space into which the MMC memory card is inserted. In the following description, the MMC memory card is inserted into the MMC memory card socket 100.

An MMCCMD (MultiMediaCard-COMMAND) bus 102 performs a function of exchanging commands between a controller (not shown) and the MMC memory card, and an MMCCLK (MultiMediaCard-CLOCK) bus 104 clocks the MMC memory card. It performs a function to supply (clock). In addition, an MMCDAT (MultiMediaCard-DATA) bus 106 performs a function of exchanging data between the controller and the MMC memory card.                         

Table 1 below shows the function of each pin of the MMC memory card using 8-bit data.

Pin No. Name Type Description One DAT3 I / O / PP Data 2 CMD I / O / PP / OD Command / Response 3 Vss1 S Supply voltage ground 4 VDD S Supply voltage ground 5 CLK I Clock 6 Vss2 S Supply voltage ground 7 DAT0 I / O / PP Data 8 DAT1 I / O / PP Data 9 DAT2 I / O / PP Data 10 DAT4 I / O / PP Data 11 DAT5 I / O / PP Data 12 DAT6 I / O / PP Data 13 DAT7 I / O / PP Data

S (supply): Power supply, I (input): Input, O (output): Output, PP (Push-Pull): Push-pull operation, OD (open drain): Open drain

Here, the number of pins in Table 1 and FIG. 1 is different because, as described above, bits of data used in FIG. 1 and Table 1 are different. When only the 7th pin DAT0 is used in the MMC memory card using the 8-bit data of Table 1, the same operation as the MMC memory card using the 1-bit data of FIG. 1 is performed.

1 and Table 1, when the MMC memory card is inserted, the pin 2 (CMD) of the MMC memory card is connected to the MMCCMD (MultiMediaCard-Command) (102) bus and the control unit of the portable terminal In order to control the MMC memory card, a function of transmitting and receiving a control signal and a response to the control signal is performed.                         

Pin 5 (CLK) of the MMC memory card is connected to the MultiMediaCard-Clock (MMCCLK) bus to supply a clock to the MMC memory card, and pin 7 (DAT0) of the MMC memory card is connected to the MMCDAT ( MultiMediaCard-Data) 104 is used to connect to the bus and use 1 bit of data.

A power is connected to pin 4 (V _DD ) of the MMC memory card to supply power to the entire MMC memory card 100, and pin 3 (Vss1) and pin 6 (of the MMC memory card 100) Vss2) is connected to ground.

A terminal using the MMC memory card according to the related art uses a polling technique to determine whether the MMC memory card is inserted. Here, the polling method inquires of a plurality of terminal apparatuses sequentially from the computer or the terminal control apparatus, etc., and instructs the terminal apparatus to start the transmission when there is a request. If there is no request, it is a transmission control method that inquires of the next terminal device whether or not there is a transmission request.

In the circuit configured as described above, the operation of the polling method for confirming the insertion of the MMC memory card is performed by applying a clock from the controller of the terminal to the MMC memory card through the MMCCLK 102 bus. The response from the memory card is checked to confirm whether the MMC memory card is inserted.

As described above, when checking whether the MMC memory card is inserted using a polling technique, the controller needs to continuously check whether the MMC memory card is inserted at a predetermined period, thereby increasing the burden on the operation of the controller. have.

Accordingly, an object of the present invention is to provide an apparatus and method for recognizing whether a memory card is inserted in hardware in a portable terminal using a memory card.

Another object of the present invention is to provide an apparatus and method for recognizing whether a memory card is inserted using an interrupt method in a portable terminal using a memory card.

Another object of the present invention is to provide an apparatus and method for recognizing whether the memory card is inserted using a pull-up resistor in a portable terminal using the memory card.

In the present invention for achieving the above object, the apparatus for recognizing the insertion of the memory card in the portable terminal, the interrupt generator for generating an interrupt signal into which the memory card is inserted, and receives the generated interrupt signal is applied to the memory And a control unit for recognizing the insertion of the card.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, a description will be given of a technique for recognizing whether a memory card is inserted in an interrupt method in a portable terminal using a memory card.

The memory card is a smart media card (SMS: Smart Media Card), multimedia card (MMC: Multi Media Card), Compact Flash (CF: Compact Flash), Secure Digital (SD: Secure Digital), Memory Stick (MS: Memory Stick) and the like, hereinafter, it is assumed that the MMC is used.

2 illustrates a circuit of a system for determining whether a multimedia card is inserted by using an interrupt method in a portable terminal according to an exemplary embodiment of the present invention. In the following description, the portable terminal includes a hybrid wireless terminal (PDA) using an MMC memory card, a personal communication system (PCS), an MP3 player (MPEG Audio Layer-3 Player), a digital camera ( Digital Camera), electronic notebook, etc. are included.

Referring to FIG. 2, the MMC memory card socket (MultiMediaCard-Socket) 100 is a space into which the MMC memory card is inserted. In the following description, an MMC memory card is inserted.

The interrupt generator 201 includes the power supply VDIG and the pull-up resistor, and generates an interrupt signal for recognizing whether the memory card is inserted into the control unit (not shown). to provide.

The pull-up resistor is used to make a high signal when a certain point is normally in a floating state. Here, the floating state indicates a state in which the high logic signal and the low signal are not high in the digital logic circuit. For example, using a pull-up resistor, a push-pull switch is connected to one side of the floating wire, and when the wire is pressed, the switch becomes a logic signal low signal. If you want to make a switch that becomes a high signal when you release it, if you do not press the switch, that is, in the normal state between the power supply (+) side and the conductor using a resistor so that the conductor becomes a high signal. When connected to the wire can be a high signal. The resistor used at this time is called a pull-up resistor. In particular, according to the present invention, when the MMC memory card is inserted into the MMC memory card socket 100, it provides a low signal to the control unit to perform a function of notifying whether the MMC memory card is inserted.

An MMCDETECT (MultiMediaCard-DETECT) bus 203 is connected to the sixth pin and the interrupt generator 201 to output an interrupt signal generated by the interrupt generator 201 to a general purpose input (GPIO) of the controller. Output) function is provided.

Pin 2 of the MMC memory card is first connected to the MMCCMD 102 bus to receive a command from the controller and send a response. Pin 5 is connected to the MMCCLK 104 bus to apply a clock to the MMC memory card.

Pin 7 is connected to the MMCDAT 106 bus to exchange data. Pin 4 is also connected to a power supply (VMMC) to supply power to the entire MMC memory card. Pin 3 is connected to ground.

Pin 6 is connected to a controller (not shown) via the MMCDETECT (MultiMediaCard-DETECT) 203 bus. As shown in the drawing, a pull-up resistor is connected between the MMCDETECT 203 bus and a power supply VDIG, and a high signal or a low signal is supplied to the controller depending on whether a memory card is inserted. To provide. For example, when the memory card is connected, the low signal is provided to the controller because the sixth pin is shorted to the ground GND. If the memory card is not connected, the sixth pin is provided. Since it is open, it provides a high signal to the controller. In other words, the controller detects a signal input through the MMCDETECT bus 203 and checks whether a memory card is inserted.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

 As described above, the present invention has an advantage that the burden on the controller can be reduced by recognizing whether the memory card is inserted using the interrupt technique in the portable terminal. In other words, by adding a pull-up resistor to a predetermined pin of the memory card to generate an interrupt signal, a conventional polling technique for checking whether the MMC memory card is inserted periodically reduces the burden on the controller using the generated interrupt signal. There is this.

Claims (4)

An apparatus for recognizing insertion of a memory card in a portable terminal, An interrupt generator for generating an interrupt signal when the memory card is inserted; And a controller for recognizing the insertion of the memory card by the interrupt signal. The method of claim 1, The memory card is a smart media card (SMS: Smart Media Card), multimedia card (MMC: Multi Media Card), Compact Flash (CF: Compact Flash), Secure Digital (SD: Secure Digital), Memory Stick (MS: Memory Stick), characterized in that any one device The method of claim 1, The interrupt generator, And a pull-up resistor connected between a predetermined pin of a socket to which the memory card is attached and a predetermined bus and a control unit, and a power supply unit. The method of claim 3, wherein The interrupt generator, When the memory card is inserted, the predetermined pin is shorted to a ground in the memory card to provide a low signal to the controller. If the memory card is not inserted, the predetermined pin is opened. in the open state, wherein the pull-up resistor provides a high signal to the control unit.

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