An interface circuit is described for interfacing a peripheral device and a microprocessor to enable data transference between a memory location within the peripheral device and a data bus of the microprocessor. In accordance with the type of bus control used by the microprocessor, the interface circuit...http://www.google.com.tw/patents/US5339395?utm_source=gb-gplus-share專利 US5339395 - Interface circuit for interfacing a peripheral device with a microprocessor operating in either a synchronous or an asynchronous mode
