MAX®7000S和MAX 9000器件出厂时已空白。当空白器件上电时，所有I / O引脚都处于三态。对于支持ISP的器件，I / O引脚的状态非常重要，因为您可以将空白器件焊接到印刷电路板（PCB）上，然后在制造流程中对器件进行编程。通过三态I / O引脚，Altera确保空白器件的I / O引脚不会在PCB上产生冲突。
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