DM8168使用colorbar验证DVO2输出，即VOUT[0]输出，将0x4810A000设置为0x4401B05A，bit15置1，bit3-0为1010，即显示模式为1080I，
但是测试VOUT[0]_CLK引脚输出时钟为148.5MHz，这是什么原因？
我想让VOUT[0]_CLK输出时钟为74MHz，请问需要怎么配置？需要配置哪些寄存器？
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