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:
Aug. 28, 2001
Filed:
Dec. 20, 1999
Masaru Sugimoto, Tokyo, JP;
Yasuhide Nakase, Hyogo, JP;
Tomohiro Nishimura, Hyogo, JP;
Teruhiko Funakura, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A waveform and timing generation circuit,, a skew circuit,, and a pin driver,are provided for each of a plurality of I/O terminals,corresponding respectively to a plurality of pins furnished on an LSI. A relay,and a loop control circuit,are provided to feed an output signal of the pin driver,back to an input side of the waveform and timing generation circuit,. A skew board,is used to adjust the skew circuit,, whereby the initial timing calibration is carried out. With the skew circuit,thus adjusted, oscillations are generated over the feedback path, and the number of resulting pulses is counted (to obtain pulse cycles). When the skew circuit,is adjusted so that the pulse count above matches the number of pulses generated during oscillations, a simplified form of timing calibration is implemented.