The present invention relates to serial ATA control circuit, especially one kind of serial ATA control circuit capable of switching route. The main structure includes several serial ATA controllers, several port controlling circuits, several switching units and one switchnig unit controller. Each serial ATA controller includes at least one memory access controller and two transceivers, the port controlling circuit can be connected to the serial ATA unit, and the switching units are used to connect the port controlling circuits and the transceivers. By means of the control of the switching unit controller, the port controlling circuits and the transceivers can be switched in connection route to reach highest system data accessing utility. |