According to the structure and related features of PLL in Xilinx Spartan-6, a method is proposed for configuring the pixel clock in the image transmission dynamically. The encoded value from different pixel clocks and the image data from the transmitting end are sent to the receiving end, and the corresponding pixel clock is recovered through PLL dynamic reconfiguration with on-line switchover of the image transmission formats in 1.4 μs. This de- sign features a simple interface, fast speed frequency conversion, hard real-time, high stability, instantaneity and flexibilit...