| This paper generalized the developing background and the advantages of USB. The hierarchical structure including physical interface, protocol, and transmission means of data etc are introduced briefly. The interface between Windows Operation System and the USB and the USB system architecture are described correspondingly.Based on the understanding of USB specification, the paper expounded the interface performance of the fingerprint gathering system with the USB interface chip, AN2131QC. By the means of the USB device, I have been elaborated the function, theory and realization of hardware on the system board in this paper. Meanwhile, the paper emphasized how to apply and development AN2131QC and CPLD in detail. Also it expounded the main points and implementing methods when develop device driver software in such PNP devices. |
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