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:
Sep. 09, 2014
Filed:
Dec. 04, 2012
Altera Corporation, San Jose, CA (US);
Kazi Asaduzzaman, Fremont, CA (US);
Tim Tri Hoang, San Jose, CA (US);
Tin H. Lai, San Jose, CA (US);
Shou-Po Shih, Cupertino, CA (US);
Sergey Shumarayev, Los Altos Hills, CA (US);
Altera Corporation, San Jose, CA (US);
Abstract
An integrated circuit ('IC') may include clock and data recovery ('CDR') circuitry for recovering data information from an input serial data signal. The CDR circuitry may include a reference clock loop and a data loop. A retimed (recovered) data signal output by the CDR circuitry is monitored by other control circuitry on the IC for a communication change request contained in that signal. Responsive to such a request, the control circuitry can change an operating parameter of the CDR circuitry (e.g., a frequency division factor used in either of the above-mentioned loops). This can help the IC support communication protocols that employ auto-speed negotiation.