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. 18, 2007
Filed:
Jul. 17, 2006
Hiroyuki Suto, Kawasaki, JP;
Masahide Kanegae, Kawasaki, JP;
Osamu Kawashima, Kawasaki, JP;
Michihiko Umeda, Kawasaki, JP;
Hiroyuki Suto, Kawasaki, JP;
Masahide Kanegae, Kawasaki, JP;
Osamu Kawashima, Kawasaki, JP;
Michihiko Umeda, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
In an electronic device having an interface circuit which operates using a fast clock source, frequency deviation of the clock source is inspected in the mounted state. The clock pulses of the fast clock source are counted in synchronization with an electronic device serving as reference, and the result is checked; or, alignment data of transfer data and overflow/underflow of the FIFO buffer are utilized; or, the count values of an internal counter and a fast clock counter are utilized, to check for frequency deviation of the fast clock source. In the state of being mounted in the device, tests can be performed of the clock sources of all units.