Interface device having variable data transfer mode and operation method thereof

摘要

An interface device according to the present invention interfaces with a host by an m-bit unit. A flag signal generator circuit generates a mode flag signal indicating whether a data transfer mode of the interface device is a multi-transfer mode. A control circuit operates responsive to information indicating whether an address from the host is a data width aligned address and whether the address thus transmitted belongs to a data width aligned address range. The control circuit causes m-bit data from the host to be continuously stored in a first-in first-out memory. Data continuously stored in the memory is at once transmitted to a high-speed bus connected to the interface device.