US 11,768,987 B2
System for facilitating secure communication in system-on-chips
Sandeep Jain, Noida (IN); Kirk Taylor, Austin, TX (US); Vivek Sharma, New Delhi (IN); and Arpita Agarwal, Delhi (IN)
Assigned to NXP USA, INC., Austin, TX (US)
Filed by NXP USA, Inc., Austin, TX (US)
Filed on Apr. 1, 2020, as Appl. No. 16/836,945.
Prior Publication US 2021/0312115 A1, Oct. 7, 2021
Int. Cl. G06F 30/38 (2020.01); G06F 9/30 (2018.01); G06F 7/58 (2006.01); G06F 30/398 (2020.01)
CPC G06F 30/38 (2020.01) [G06F 7/58 (2013.01); G06F 9/30021 (2013.01); G06F 30/398 (2020.01)] 20 Claims
OG exemplary drawing
 
1. A protection system for facilitating secure communication of a critical signal from a first functional circuitry to a second functional circuitry, the protection system comprising:
a selection circuit that is coupled with the first functional circuitry, and is configured to receive the critical signal, a set of dynamic pattern bits, and a set of fixed reference bits, wherein the selection circuit is further configured to select and output based on a logic state of the critical signal, one of the set of dynamic pattern bits and the set of fixed reference bits as a set of selected bits; and
a comparison circuit that is coupled with the second functional circuitry, and is configured to receive the set of dynamic pattern bits and a set of intermediate bits that is derived from the set of selected bits, and output an output signal, wherein the comparison circuit is further configured to provide the output signal to the second functional circuitry when a logic state of the output signal matches the logic state of the critical signal, thereby facilitating secure communication of the critical signal.