Key gets updated when either the last word of the key data or the last word of "special key data y" is written. When writing to special key data the actual key is F((key data x) xor (key data y)) where F is some unkown function implemented in hardware.
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Key gets updated when either the last word of the key data or the last word of "special key data y" is written. When writing to special key data the actual key is F((key data x) xor (key data y)) where F is some unknown function implemented in hardware.