针对数控设备的限位保护功能有些欠缺，容易发生超程故障等问题，提出采用把所有限位保护电路改为负逻辑控制，并对这一方案进行了理论分析和实践。
As for the above-mentioned problems, the research puts forward to turn all circuit protection into negative logic control and has carried out theory analysis and practice.
当阈值电压为负且通过向控制栅极施加0V来尝试读取时，存储器元件将接通以指示正在存储逻辑1。
When the threshold voltage is negative and a read is attempted by applying 0 V to the control gate, the memory element will turn on to indicate logic one is being stored.
当阈值电压为负且通过向控制栅极施加0V来尝试读取时，存储器元件将接通以指示正在存储逻辑1。
When the threshold voltage is negative and a read is attempted by applying 0 V to the control gate, the memory element will turn on to indicate logic one is being stored.
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