| CTRL_SPEC | PUF Control register
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| ENROLL_R | Field enroll reader - Begin Enroll operation
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| ENROLL_W | Field enroll writer - Begin Enroll operation
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| GENERATEKEY_R | Field GENERATEKEY reader - Begin Set Intrinsic Key operation
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| GENERATEKEY_W | Field GENERATEKEY writer - Begin Set Intrinsic Key operation
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| GETKEY_R | Field GETKEY reader - Begin Get Key operation
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| GETKEY_W | Field GETKEY writer - Begin Get Key operation
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| R | Register CTRL reader
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| SETKEY_R | Field SETKEY reader - Begin Set User Key operation
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| SETKEY_W | Field SETKEY writer - Begin Set User Key operation
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| START_R | Field start reader - Begin Start operation
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| START_W | Field start writer - Begin Start operation
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| W | Register CTRL writer
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| ZEROIZE_R | Field zeroize reader - Begin Zeroize operation for PUF and go to Error state
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| ZEROIZE_W | Field zeroize writer - Begin Zeroize operation for PUF and go to Error state
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