USB-based data interception system and method
A USB interface and data technology, applied in the field of electronics and communication, can solve the problems of not working normally, lack of portability and versatility
Active Publication Date: 2021-03-26
KUNMING UNIV OF SCI & TECH
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Problems solved by technology
However, the monitoring and collection of real-time sending and receiving data of the USB interface realized by software on the computer does not have good portability and versatility, and different computers need to be configured and debugged multiple times; and without the assistance of the host computer software, won't work properly
At present, there is no real-time monitoring and collection of data in two directions on the USB 2.0 bus, and processing and combining them into a USB transaction and sending it to the backplane circuit for use by the backplane circuit
Method used
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Embodiment 1
[0053] Embodiment 1: as Figure 1-4 As shown, a data interception system based on USB includes an FPGA module 1, a USB interface chip module 2, an IO expansion port module 3, a USB interface A11, and a USB interface B12;
[0054] Described USB interface chip module 2 connects main equipment 9 and slave equipment 10 non-invasively through the USB bus of USB interface A11, USB interface B12; USB interface chip module 2 is also connected with FPGA module 1, and FPGA module 1 comprises ULPI interface module 4. Packet decomposition module 5, transaction combination module 6, transmission module 7, clock module 8; clock module 8 is respectively connected with USB interface chip module 2, ULPI interface module 4, packet decomposition module 5, transaction combination module 6, transmission module 7 connection; the IO expansion port module 3 is connected to the transmission module 7 of the FPGA module 1; the IO expansion port module 3 is docked with the backplane circuit.
[0055] As...
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The invention relates to a USB-based data interception system and method, and belongs to the technical field of electronics and communication. According to the invention, under the condition of not interfering the data flow between the original USB master and slave devices, the signal on the USB data differential line is directly extracted from the USB bus intermediate lead connected with the master and slave devices; the differential signal is received through a special USB2.0 PHY chip, the differential signal is restored into a level signal, further the level signal is converted into parallel data, and the parallel data is sent into an FPGA; a specially designed FPGA internal logic circuit analyzes and processes a data packet, and unpacked and integrated master and slave device transmission data is output through an 8-bit parallel bus. According to the invention, signals are intercepted in a non-invasive manner through the USB PHY, the FPGA processes data packets, and data transmitted between the USB master device and the USB slave device can be directly output through the parallel IO port without other special devices (such as a PC).
Description
technical field [0001] The invention relates to a system and method for intercepting data based on USB, which belongs to the technical field of electronics and communication, and in particular provides a method for real-time processing of intercepted image data based on a single-chip microcomputer, CPLD or FPGA backplane. Background technique [0002] With the continuous development and popularization of digital products, the data exchange between devices has become more frequent and high-speed, and the USB protocol has become one of the mainstream protocols for data transmission between various devices. Devices that support the USB protocol are not only very common in our daily life, but also very common in scientific research, for example: various external detection devices, instruments, telescopes, various signal analyzers, etc. standard interface. The USB bus is one of the common external bus standards, and is used for data exchange and communication between the host co...
Claims
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IPC IPC(8): G06F13/42
CPCG06F13/4286G06F13/4291G06F2213/0042Y02D10/00
Inventor 李彬华苗旺金建辉何春
Owner KUNMING UNIV OF SCI & TECH