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AWR1642: LVDS Clock rate

Part Number: AWR1642
Other Parts Discussed in Thread: AWR1243

Since the highest clock rate of AWR1642 is 450MHz, which means 900Mbps for DDR data transfer, why in section "5.10.4.1 LVDS Interface Timings" of the datasheet, there is a LVDS_CLK at the frequency of 900MHz? Following the above logic, the data rate would be 1.8GHz for a 900MHz clock. Which point do I get wrong?