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Embedded equipment and method for downloading program of programmable logic device in same
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An embedded device, programming logic technology, applied in program control devices, program loading/starting, instruments, etc., can solve problems such as power-off and unpacking of downloaded programs
Inactive Publication Date: 2014-11-05
WUHAN ZHONGXING SOFTWARE CO LTD
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[0006] The technical problem to be solved by the present invention is to provide an embedded device and a method for downloading a program of a programmable logic device therein, to solve problems such as power-off and unpacking of a programmable logic device in an existing embedded device when downloading a program, which is simple and convenient. Realize the download of programmable logic device
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Embodiment 1
[0040] Such as figure 2 As shown, use the 4 free pins in the serial port connector RJ45 as the download signal lines TCK, TMS, TDI and TDO of the programmable logic device, and use the signal ground GND used by the serial port as the signal ground GND for the download of the programmable logic device to realize It realizes the program download and upgrade of the programmable logic device directly on the serial port connector RJ45.
[0041] exist figure 2 In the application scenario of direct connection as shown, when you need to download the program of the programmable logic device, you only need to connect the corresponding signal line in the download cable to the five signal lines (TCK, TMS, TDI , TDO and GND) on it. The serial communication still uses the 4 pins in the original RJ45 (only three signals: TX, RX and GND).
[0042] When it is necessary to download the program of the programmable logic device, when the device is powered off, the Figure 4 Insert the cryst...
Embodiment 2
[0045] Such as image 3 As shown, use the 4 free pins in the serial port connector RJ45 as the download signal lines TCK, TMS, TDI and TDO of the programmable logic device, use the signal ground GND used by the serial port as the signal ground GND for the download of the programmable logic device, and at the same time A gate control circuit is added to the signal line between the serial port connector RJ45 and the programmable logic device, and the gate control circuit controls four switches S1, S2, S3, and S4.
[0046] The gate control circuit may be one of transistors, MOS tubes, electronic switches, relays or logic chips. The control signal DCL of the gate control circuit can be controlled by a programmable logic device, can also be controlled by a CPU, or can be controlled by other logic circuits. The gate control signal DCL controls the four switches S1, S2, S3, S4 to be closed or opened.
[0047] For example, when the control signal DCL of the gate control circuit is c...
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Abstract
The invention discloses embedded equipment and a method for downloading the program of a programmable logic device in the embedded equipment. The embedded equipment comprises a CPU (Central Processing Unit), a programmable logic device and an RJ45 serial interface connector, wherein a downloading signal line of the programmable logic device is connected with a spare pin of the RJ45 serial interface connector; and a signal ground GND of the programmable logic device is connected with a signal ground GND of the RJ45 serial interface connector. The downloading signal line of the programmable logic device is connected with the spare pin of the RJ45 serial interface connector in a direct connection manner or through a door control circuit. When the program of the programmable logic device in the embedded equipment needs to be downloaded and updated, a computer can realize the program downloading or updating of the programmable logic device through the RJ45 serial interface connector. With the adoption of the embedded equipment and the method, the program downloading of the programmable logic device can be realized under the situations of packing and power failure.
Description
technical field [0001] The invention relates to the technical field of embedded systems, in particular to an embedded device and a method for downloading a program of a programmable logic device in the embedded device. Background technique [0002] With the development of embedded system technology, most communication products include CPU (Central Processing Unit, Central Processing Unit) and programmable logic device EPLD (Erasable ProgrammableLogic Device, erasable and programmable logic device). In order for the CPU of the embedded device to communicate with the computer, or for the embedded system to accept the configuration of the computer, it needs to be connected to the computer through a serial port, and most of the connected interfaces choose the RJ45 interface. [0003] Such as figure 1 As shown in , the internal block diagram of the embedded system that currently selects RJ45 as the serial port communication is given. The RJ45 interface contains 8 connecting pin...
Claims
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Application Information
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