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AD9163 SERDES PLL locked, but DLL unlocked

Hello, I am debugging on AD9163 of the custom board.

The DAC device clock is 4.8G and jesd204b is 8 lane with 4G lane rate.

Other configration was as followed:

0x110=0x84    // 8lane and 6 interpolar

0x230=0x0     //lane rate less than 6G

0x289=0x01   //ref clk div by 2

0x084=0x00   // pll ref clk rate 1x

After the start up sequence, the 0x092 was 0x0(dll unlocked), the 0x281 was 0x0B(pll locked). 

Has some one know the source of this issue?