US Patent No. 10,565,048

LOGIC BUFFER FOR HITLESS SINGLE EVENT UPSET HANDLING


Patent No. 10,565,048
Issue Date February 18, 2020
Title Logic Buffer For Hitless Single Event Upset Handling
Inventorship David Anthony Cananzi, Sunnyvale, CA (US)
Elliott B. Van Hartingsveldt, Sunnyvale, CA (US)
Michael Romain, Mountain View, CA (US)
Assignee Arista Networks, Inc., Santa Clara, CA (US)

Claim of US Patent No. 10,565,048

1. A method for handling a single event upset (SEU), the method comprising:receiving, from a monitored device, a first data at a first input of an initial state change device;
detecting, based on receiving the first data, a first state change;
asserting, based on detecting the first state change, an initial state change device enable signal;
transferring the first data from the first input to a first output of the initial state change device, wherein the first output is operatively connected to a second input of a state hold device;
triggering, based on detecting the first state change, a delay counter to count a delay period;
making, by a validation engine, a first determination that the delay period counted by the delay counter has expired without receipt of an error detection signal; and
based on the first determination, asserting a state hold device enable signal to allow the first data to pass from the second input to a second output of the state hold device.