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我看了有些人的板在ddr2地址线加匹配电阻，数据线不加。有的人在数据线加匹配电阻地址线不加，到底应该在那里加的，是参考DDR芯片的手册还是参考TMS320C6748的手册来做？
按照数据手册来做。6.11.3.9 DDR2/mDDR Signal Terminationhttp://www.ti.com/lit/ds/symlink/tms320c6748.pdf
参考6748的手册来做
如果不加匹配电阻需要把DDR控制器设成weak drive模式
