KR20070094397A - Apparatus and method for transmitting of data - Google Patents

Abstract

An apparatus and a method for transmitting data are provided to save time used in data communication, be easy to use, and reduce cost by enabling a user to transmit the data to a device through a USB(Universal Serial Bus) communication method in a user's PC(Personal Computer) and enabling a device terminal to selectively use a desired interfacing method. An apparatus for transmitting data(20) comprises the followings: a USB(Universal Serial Bus) communication interface unit(21) which performs USB communication with a PC(Personal Computer); a code extractor(23) which extracts an interface identification code included in inputted data; a first converter(24) which converts the data to transmit and receive the data to a first interface; a second converter(25) which converts the data to transmit and receive the data to a second interface; and a control unit(22) which controls to transmit and receive the data to an interface corresponding to the extracted identification code.

Description

Apparatus and method for transmitting of data

1 is a block diagram illustrating the concept of a data transmission apparatus of the present invention;

2 is a block diagram including the detailed configuration of the device of FIG.

3 is a detailed block diagram of the data transmission apparatus of FIG. 1;

4 is a block diagram of a device including a data transmission apparatus according to an embodiment of the present invention;

5 is a flowchart illustrating a data transmission method according to an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

10: PC 11: code insertion unit

20: data transmission device 21: USB interface unit

22: control unit 23: code extraction unit

24: first converter 25: second converter

30: device 31: CPU

311: JTAG controller 32: SRAM

33: ROM

The present invention relates to a data transmission apparatus and method for transmitting and receiving data between a PC and a device.

In general, as a new type of PC environment, such as a multimedia PC, a home network, and a communication environment centering on the PC, a peripheral device controlled by the PC is rapidly increasing.

       As a result, the current 1: 1 connection between PCs and peripheral devices has reached saturation in terms of scalability of peripheral devices. I came up with a connection plan.

   As a result, a universal serial bus (USB) for low and medium speed data transfer is used as a protocol for communication with various devices centering on a PC.

       That is, USB is applied to devices with low to medium speeds of 12 [Mbps] or less such as various modems, printers, joysticks, mice, keyboards, scanners, and the like.

       JTAG communication is used in addition to USB communication to communicate with these various devices. Originally, JTAG was a port for testing internal hardware of chips having complex circuits proposed by a group called Joint Test Access Group.

       In order to easily test the normal operation of such components and circuits, a dedicated emulator for debugging hardware has been introduced. Recently, a JTAG emulator has been widely used.

       This JTAG method is used for debugging by embedding standardized logic and test pins dedicated to the test in a large large scale integrated circuit (LSI) such as a complex programmable logic device (CPLD). JTAG type interface is basically controlled by 5 pins of TDI, TMS, TCK, TRST and TDO, and the test pins are connected one-to-one with FPCB (Flexible Printed Circuit Board) connected to the parts or circuit of the terminal to control the terminals (For example, MSM) is used for all tests, such as hardware checks and connections.

       A device that communicates with an existing PC has USB and JTAG communication methods and communicates with a PC through USB or with a PC through JTAG.

       However, in order to use the device through the USB method and the JTAG method, separate spaces for the USB interface and the JTAG interface must be allocated to the device, and the necessary software must be downloaded after the device is 'on' for normal operation. If you change the software, you must download the software using JTAG.

       Therefore, there is a problem in that it is cumbersome and has to have separate devices because data must be transmitted in different ways depending on the situation.

Accordingly, an object of the present invention is to adopt the USB communication between the PC and the device and to selectively use the interface for data transmission in the device to solve the above problems, so that both interfacing methods can be used in one device. A data transmission apparatus capable of transmitting data and a method thereof are provided.

The data transmission apparatus according to the present invention for achieving the above object is a data transmission apparatus for transmitting data between a PC and a device connected to the PC via a USB communication method and transmitting and receiving data through the first interface and the second interface; USB communication interface unit for performing USB communication with the PC; A code extracting unit for extracting an interface identification code included in the input data; A first converter for converting data to be transmitted and received with a first interface; A second converter converting data to be transmitted and received through a second interface; And a control unit for controlling to transmit and receive data through the interface corresponding to the extracted identification code.

In addition, according to the present invention, the first interface is characterized in that the microprocessor interface.

In addition, according to the present invention, the second interface is characterized in that the JTAG interface.

In addition, according to the present invention, the second converter is characterized in that the JTAG host.

A data transmission method according to the present invention is a data transmission method for transmitting data between a PC and a device connected to a PC via a USB communication method and transmitting and receiving data through a first interface and a second interface, the data being transmitted from a PC. Extracting the included interface identification code; A second step of switching to an interface mode corresponding to the extracted identification code; And a third step of transmitting data through the first interface when the converted interface is the first interface and through the second interface when the second interface is the second interface.

In addition, according to the present invention, the first interface is characterized in that the microprocessor interface.

In addition, according to the present invention, the second interface is characterized in that the JTAG interface.

Hereinafter, with reference to the accompanying Figures 1 to 5 will be described in detail a preferred embodiment of the present invention.

1 is a block diagram illustrating the concept of a data transmission apparatus of the present invention.

Referring to FIG. 1, a PC 10 performing USB communication, a device 30 performing a microprocessor interface and a JTAG interface, and a data transmission device 20 existing between the PC 10 and the device 30. ). The data transmission device 20 communicates with the PC 10 via USB and the device 30 interfaces with two interfaces to transmit and receive data between the PC 10 and the device 30. The data transmission device 20 between the PC 10 and the device 30 receives data from the PC 10 via USB communication and transmits the data to the device 30 by selecting one of two interfaces. Can transmit That is, for this purpose, the code insertion unit 11 of the PC 10 inserts a command for selecting an interface of the device 30 into the data to be transmitted as an identification code. The data transmission device 20 decodes the identification code inserted into the data to be transmitted from the PC 10 to determine the data transmission to which interface to transmit the data through the corresponding interface.

Here, the configuration of the device 30 for transmitting and receiving data with two interfaces will be described with reference to FIG. 2.

2 is a block diagram including the detailed configuration of the device of FIG.

Referring to FIG. 2, the device 30 includes a JTAG controller 311 for a JTAG interface and controls each component through a CPU 31 for transmitting and receiving data and a microprocessor interface for microprocessor interface. SRAM 32, which is a storage means for transmitting and receiving data, and ROM 33, which is a storage means for transmitting and receiving data through the JTAG interface by the JTAG controller 311. The CPU 31 transmits data through the microprocessor interface to the SRAM 32 when data is received through the microprocessor interface. Thereafter, data from the PC 10 is directly stored in the SRAM 32 through the opened microprocessor interface.

When data is received through the JTAG interface, the CPU 31 activates the JTAG controller 311 and transmits the data to the ROM 33 via the JTAG interface. Similarly, data from the PC 10 is directly stored in the ROM 33 via the JTAG interface.

Therefore, when applied to the device 30 that requires the function to transfer data through the JTAG interface, it can be selectively used with the microprocessor interface as needed, and can normally transmit and receive data through the microprocessor interface.

The device 30 of FIG. 2 will be described in more detail with reference to the detailed block diagram of the data transmission apparatus 20 of FIG. 3.

3 is a detailed block diagram of the data transmission apparatus of FIG. 1.

Referring to FIG. 3, the data transmission device 20 may include a USB interface unit 21 for performing USB communication with the PC 10, and a code extraction unit 23 for extracting an interface identification code included in the input data. And a control unit 22 for selecting an interfacing method according to a command to the extracted code to control data transmission and reception through a corresponding interface, a first converter 24 for converting data to be transmitted and received through a microprocessor interface, and a JTAG. And a second converter 25 that converts data to and from the interface.

In FIG. 3, the USB interface unit 21 is connected to the PC 10 via a USB communication line to transmit and receive data from the PC 10 and output the received data to the controller 22. The control unit 22 transmits the received data to the code extracting unit 23, and when the command signal for selecting the interfacing method is extracted from the code extracting unit 23, the control unit 22 receives the first and second converters 24 and 25. ).

Here, when the identification coat extraction result is a command signal of the microprocessor interface, the first converter 24 transmits to the SRAM 32 of the data received from the PC 10 to transmit the data to the SRAM 32 through the microprocessor interface. Only data to be stored is extracted and transmitted to the CPU 31. The CPU 31 then stores the transferred data in the SRAM 32 and subsequently transfers the data through the same microprocessor interface. Therefore, high speed data transmission is possible.

On the other hand, when the identification code extraction result is a command signal of the JTAG interface, the second converter 25 serves as a JTAG host to transfer data to the ROM 33 through the JTAG interface and the JTAG controller 311 of the CPU 31. Will send a communication request. Accordingly, if there is a communication response from the JTAG controller 311, data is continuously transmitted through the JTAG interface.

4 is a block diagram of a device including a data transmission apparatus according to an embodiment of the present invention.

Referring to FIG. 4, the data transmission device 20 is located between the PC 10 and the device 30. For this purpose, the data transmission device 20 is mounted in the device 30 in the form of a chip. Since 4 is preferable, the following description will be given in the form of a chip mounted on the device.

That is, the data transfer apparatus 20 of the present invention is mounted in the device 30 in front of the CPU 31. The internal block of the data transmission device 20 is as described with reference to FIG. The PC 10 terminal is connected to the data transmission apparatus 20 so as to perform only USB communication, and allows two interface methods to be selectively used with the CPU 31 of the device 30. Description of the same as described with reference to FIG.

Thus, the data transmission apparatus according to the present invention has been described, and the data transmission method will be described with reference to FIG.

5 is a flowchart illustrating a data transmission method according to an embodiment of the present invention.

Referring to FIG. 5, the controller 22 receives data including a code for identifying an interfacing scheme from the PC 10 (S10). If data is received, the interface identification code is extracted from the received data (S20). When the extraction of the identification code is completed, it is determined whether the microprocessor interface code (S30). If it is determined that the microprocessor interface code, the microprocessor interface mode (S40). That is, the microprocessor interface mode herein refers to driving the first converter 24 to transfer data to the SRAM through the microprocessor interface.

On the other hand, if it is determined that the microprocessor interface code is not, switch to the JTAG interface mode (S50). In this case, the JTAG interface mode means driving the second converter 25 to transfer data to the ROM through the microprocessor interface.

In this way, when the interface is determined, data is transmitted through the corresponding interface (S60).

Therefore, in the present invention, the user transmits data to a device through a USB communication method to his PC, and the device-side can selectively use a desired interfacing method, thereby saving time used for data communication and being convenient to use. Provides cost savings.

Claims (7)

In the data transmission apparatus for transmitting data between a PC and a device connected to the PC via a USB communication method and transmitting and receiving data through the first interface and the second interface, A USB communication interface unit for performing USB communication with the PC; A code extracting unit for extracting an interface identification code included in the input data; A first converter for converting data to be transmitted and received with a first interface; A second converter converting data to be transmitted and received through a second interface; And And a control unit controlling to transmit and receive data through the interface corresponding to the extracted identification code. The method of claim 1, The first interface And a microprocessor interface. The method according to claim 1 or 2, The second interface A data transmission apparatus, characterized in that the JTAG interface. The method of claim 3, wherein The second converter A data transmission apparatus, characterized in that the JTAG host. In the data transmission method for transmitting data between a PC and a device connected to the PC via a USB communication method and transmitting and receiving data through the first interface and the second interface, Extracting an interface identification code included in data received from the PC; A second step of switching to an interface mode corresponding to the extracted identification code; And And a third step of transmitting data through the first interface when the switched interface is the first interface and through the second interface when the second interface is the second interface. The method of claim 5, The first interface And a microprocessor interface. The method according to claim 5 or 6, The second interface A data transmission method, characterized in that the JTAG interface.

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