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What is shadow register ?

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lx1019

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Hi , anyone could explain to me what shadow register is ?

Or tell me any reference to read. Any web page or book name.

Thanks!
 

The shadow register term appears also in retention flops.
The retention flops are type of flops which can save their info when power is switched off. To do that they have some ballon register or "shadow" register which has a constant power, and in power down mode that register remembers the flop data.
 

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