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TMS320C6748 DDR2阻抗匹配问题

Other Parts Discussed in Thread: OMAP-L138, TMS320C6748

  从OMAP-L138_C6748 LC Dev Kit Ver A6 .pdf这个原理图看到TMS320C6748在和DDR2的连接上:数据及地址/时钟线上串接了10欧电阻,控制信号线串接了22欧电阻,这个匹配电阻是如何确定的,是和DDR2内部终结电阻为75欧还是50欧时相匹配的?