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. 12, 2006
Filed:
Sep. 11, 2003
Kazuya Ogawa, Tokyo, JP;
Seiichi Emoto, Tokyo, JP;
Kazuya Ogawa, Tokyo, JP;
Seiichi Emoto, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
A data transfer unit () is provided for use in a clock swapping system which controls data transfer with a data transmission permit signal (rwo) and data reception permit signal (rro). The data transfer unit () includes a data latch () which latches transfer data in time with a transmission enable signal (ewi) and from which the data is read in time with a reception enable signal (eri), a first FR-FF circuit () which delays the transmission enable signal (ewi) for at least one period of a transmission clock (ckw), and a third SR-FF circuitwhich delays the reception enable signal (eri) for a period of a reception clock (ckr). In the data transfer unit (), a signal latched by the first SR-FF circuit () is latched a series of two times in time with the reception clock (ckr) to generate the reception permit signal (rro) and a signal latched by the third SR-FF circuit () is latched a series of two times in time with the transmission clock (ckw) to generate the transmission permit signal (rwo). Thus, the data transfer unit () can always assure stable data transfer by eliminating influence of a metastable state, if any.