The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 24, 2001
Filed:
Jan. 19, 1999
Bin Guo, Fremont, CA (US);
Dennis Lau, Fremont, CA (US);
Advanced Micro Devices, Inc., Sunnyvale, CA (US);
Abstract
An apparatus detects the loss of an asynchronous input signal and generates a reset signal that is synchronous to a system clock signal. The apparatus detects the loss of the input signal and generates a first output signal. The first output signal is delayed by a predetermined number of clock cycles, and a second output signal is generated to indicate a sustained loss of the input signal. A signal monitoring circuit is provided to confirm the loss of the input signal and generate a third output signal. The reset signal is generated only if the signal loss is both sustained and confirmed. Accordingly, the apparatus will not be unnecessarily reset as a result of noise that delays or accelerates the arrival of an edge of the asynchronous input signal. The apparatus may also be configured to monitor the loss of multiple asynchronous input signals in a multi-port channel by cascading a plurality of sub-circuits, each of which is configured to receive at least one input signal and independently generate a local reset signal. Hence, the apparatus is capable of performing a graceful recovery if any of the input signals are lost.