US 11,704,255 B2
Semiconductor device with secure access key and associated methods and systems
Nathaniel J. Meier, Boise, ID (US); and Brenton P. Van Leeuwen, Meridian, ID (US)
Assigned to Micron Technology, Inc., Boise, ID (US)
Filed by Micron Technology, Inc., Boise, ID (US)
Filed on Nov. 19, 2021, as Appl. No. 17/530,461.
Application 17/530,461 is a continuation of application No. 16/677,478, filed on Nov. 7, 2019, granted, now 11,182,308.
Prior Publication US 2022/0129392 A1, Apr. 28, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G06F 12/14 (2006.01); G06F 3/06 (2006.01); G06F 21/62 (2013.01); H04L 9/32 (2006.01); G11C 11/4074 (2006.01); G11C 17/16 (2006.01); G06F 21/79 (2013.01)
CPC G06F 12/1433 (2013.01) [G06F 12/1466 (2013.01); G06F 21/79 (2013.01); G11C 11/4074 (2013.01); G11C 17/16 (2013.01); G06F 3/0622 (2013.01); G06F 3/0637 (2013.01); G06F 12/14 (2013.01); G06F 12/1458 (2013.01); G06F 2212/1052 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a memory array;
a fuse array configured to store a first access key;
peripheral circuitry coupled to the fuse array and the memory array, and configured to:
receive an access command corresponding to an access-controlled feature, wherein the access command includes a second access key;
retrieve, in response to receiving the access command, the first access key from the fuse array;
compare the first access key with the second access key; and
determine whether to permit or prohibit execution of the access command based on comparing the first access key with the second access key.