各种 mv power cell
1. retention register :
VDDB 是 backup power,当primary power shutoff 时
backup 会继续供电,将 reg 当前状态保存下来
2. isolation cell
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1. retention register :
VDDB 是 backup power,当primary power shutoff 时
backup 会继续供电,将 reg 当前状态保存下来
2. isolation cell
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