High speed equipment must be a control chip to support high-speed transmission to complete most of the tasks of high-speed transmission. Generally speaking, there are two control chip USB, one is MCU (microcontroller) integrated in the chip inside the product, the other is a single chip to achieve the function of the USB interface. Taking into account the high-speed transmission of USB2.0, if the use of USB interface functions only chip, must be applied to a processor, if the use of single-chip microcomputer, it may not reach the transmission rate of DSP, if the use of high-speed microprocessor USB2.0, although it can meet the requirements of speed, but will increase the cost of the. 　　　　　Considering the factors, the choice of the built - in 8051, and the dynamic load of the firmware of the FX2 EZ-USB (Cy7c68013). Semiconductor EZ-USB FX2 Cypress is the world's first integrated USB2.0 microprocessor, which integrates USB2.0 transceiver, SIE (serial interface engine), enhanced 8051 microcontroller and programmable peripheral interface. FX2 this unique structure can make the data transmission rate of 56Mbytes/s, that is, the maximum bandwidth of USB2.0. In FX2, the smart SIE can handle many USB1.1 and USB2.0 protocols, thus reducing the development time and ensuring the compatibility of USB.