由于在USB 系統(tǒng)中，USB 設(shè)備之間的數(shù)據(jù)交換必須通過(guò)主機(jī)。而扮演主機(jī)角色的一
般為個(gè)人電腦。由于個(gè)人電腦的攜帶不便造成USB 設(shè)備間數(shù)據(jù)交換的不便。本文主要設(shè)計(jì)并實(shí)現(xiàn)一個(gè)可集成在便攜、移動(dòng)產(chǎn)品上的USB 控制器。它可以通過(guò)OPB 總線接口集成到一個(gè)嵌入式系統(tǒng)中，并能與USB 設(shè)備進(jìn)行正常的通訊。本文主要設(shè)計(jì)并實(shí)現(xiàn)了USB 控制器，詳細(xì)介紹了總線接口、邏輯控制部分、物理接口、數(shù)據(jù)的存取等部分。
關(guān)鍵字: USB；控制器；OPB；接口
Abstract: In the USB system, it always uses the master machine to realize the data exchange
between USB equipment. Mostly, the PC is used as this master machine. Consequently, the data exchange between USB equipment is not convenient. This paper designed and implemented a USB host controller soft core that can be used in mobile devices. The USB host controller core can be integrated in an embedded system through OPB interface，and can communicate with USB device successfully. The logic design and realization of the USB host controller is introduced next, including OPB BUS interfaces, logic control, and physical interface, read and write data, etc.
Keywords: USB; Controller; OPB; Interface