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TXS 的值无关紧要;请参阅 [常见问题解答]为什么 TXS01xx VIH/VIL 规格如此严格?
只需确保 FPGA 和时钟发生器具有兼容的电平。
(A4应保持开路;TXS 具有内部上拉电阻器。)