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TMS320C6678: DDR_TERM参数如何计算

Part Number: TMS320C6678


我们硬件上边接在PTV15脚上的电阻是1%的44.2Ω,我在其中几块板上配置DDR_TERM为RZQ/6没问题,但是有一块不行,配成RZQ/4就都OK了。想请问大神这个DDR_TERM参数具体该如何配置?怎么根据硬件计算这个参数?