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默认情况下，器件的IO上有一个内部弱上拉或下拉电阻。可以使用欧姆定律从Vccio值和指定的Ipu / Ipd值（在MachXO2数据表中找到）计算粗略的等效电阻值。数据表指定电流值（Ipu / Ipd）而不是电阻值，因为内部电路是电流源，而不是物理电阻器。电流源的电压变化不像电阻器那样。因此，以欧姆为单位指定上拉/下拉的强度会产生误导和误差。