Embedded USB HOST Module Design Based On SL811HST

With the development of computer technology， the request of a main engine’scomplexity of the central computer software, topology as well as the power of relativelyembedded system is high, however,simultaneously, the demand of main engine to the electricpower is reduced. In this paper, theoretical analysis are used to emphatically with the methodproposed to the main engine system’s improvement, by the most superiorperformance-to-price ratio, establishing USB main engine system in the scarce resources sawell as in embedded system of no-operation system. After improving the system carries onthe test, finally may discover, the performance of the improvement system has overcome theshortcoming traditional main engine system, meets the needs of community users today.Based on the rationale, may realize the embedded USB main engine applicationprocedure independence in the operating system, the equipment class agreement which USBand supports, uses the complexity of related transport protocols, regarding the computerstorage, the operating speed and so on has the quite high request, the key to establishe theembedded USB host system is, how can we solution monolithic integrated circuit’s limitedresources better and support complex USB between agreement contradiction.The realize of the development of embedded USB host system based on the monolithicintegrated circuit, has some technical difficulty, how does the specific application demandthrough monolithic integrated circuit’s limited resources processing, the specific USBequipment’s information how use cuts out the USB protocol processing, the USB main enginesystem function how realizes and so on. At present mainly has two kind of plans to solve thisproblem: First, the interior integrates USB essence MCU, the control module and takes it ason the chip the peripheral device part MCU micro controller, it including an integration’s USBphysics level, basic does not need any exterior primary device. The deficiency is the MCUchip which uses must be specific, thus has limited its application function realization, cannotsatisfy to applies the widespread embedded system design the demand, and needs the specialdevelopment kit, the development cost is high. Second,32MCU+RTOS. Because the highperformance processor/micro controller in this case may complete many tedious functions,including USB main engine function. The processor/micro controller performance is higher,its price is also higher, moreover requires the long time to its development, RTOS developsthe platform to be quite expensive, generally the enterprise realizes with difficulty, thedevelopment technology threshold is high, realizes the difficulty to be quite big. A kind of new plan is proposed in this topic, the plan has solved the two kind of plandeficiency above. We can directly use the MCU+USB master control chip, the former cancarry on the actuation to the latter, moreover also complete visit to Mass Storage kind of USBequipment. The merit of this plan is used8MCU, thus simplified the hardware circuit, reducethe periphery component togrther with the system cost. Through the execution hypothesizedsoftware module, CPU can directly drive ordinary I/O to realize the hardware peripheraldevice function.