IOB的推荐工作条件列为-0.5V至+ 4.0V,并且是
没有相对于Vcco指定,这表明没有可能的钳位二极管
当存储体未通电时,下拉IO引脚。
钳位“二极管”的唯一情况
对于PCI IOStandard是活动的,这些只会在配置后打开。
所以
看起来,当没有供电和设备时,引脚应该是三态的
尚未配置。
输入漏电流的指定不参考Vcco,但是
您可能想要检查当Vcco为0时是否仍然适用10 uA限制。
- Gabor
- Gabor
以上来自于谷歌翻译
以下为原文
The recommended operating conditions for the IOB's is listed as -0.5V to +4.0V and is
not specified relative to Vcco, which indicates that there are no clamp diodes that might
pull down the IO pins when the bank is not powered. The only case where clamp "diodes"
are active is for the PCI IOStandard, and these will only turn on after configuration. So
it appears that the pins should be tristate when the bank is not powered and the device
is not yet configured. Input leakage current is specified without reference to Vcco, but
you probably want to check if the 10 uA limit still applies when Vcco is 0.
-- Gabor
-- Gabor