Peripheral apparatus data-transmission apparatus and transmission method

The invention relates to a device and the method used for controlling data transmission, especially for the data transmission between peripheral equipment. The device includes two control units and one buffer unit which are integrated onto a same chip. When the data is just transmitted between peripheral equipment, a first control unit temporarily stores the data to be transmitted from a piece of first peripheral equipment into the buffer unit, and then a second control unit stores the data to be transmitted from the buffer unit into a piece of second peripheral equipment. The device and the method provided by the invention and used for controlling data transmission between peripheral equipment has a shorter data transmission route so as to avoid the problem of time delay caused by a long transmission route in the traditional method.