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DSP C6678 各电源模块对地电阻



自己用6678做的数据采集处理板,

DSP C6678 核电压 CVDD(0.95~1.05)未加电的时候对地电阻为12.6欧姆

  DVCC1V  对地电阻为26.7欧姆,  1.5V DDR模块和 1.8V IO模块对地电阻很大,

请问一下这是正常的吗? 感觉 1V的电压对地电阻有点奇怪,正常的各模块对地电阻应该是多少?