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请问在使用ddr3 和srio接口时,其外部时钟(ddr3clk和sriosgmiiclk)是必须的吗,考虑到其内部有专门的sysclk与之对应。
另外ddr3接口有一个差分时钟输出,它是跟哪个频率对应的,参考时钟还是内部的sysclk