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:
Jul. 14, 1998
Filed:
Nov. 03, 1995
Michael C Alexander, Austin, TX (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A system for data synchronization in a bus interface unit (12) controls the flow of data between data processor (10) operating at a higher clock rate and the address and data buses operating at a lower clock rate. The data synchronization system incorporates circuit paths operating in four different clock domains: core-rate, bus-rate, transfer-rate, and receive-rate. Circuits processing data solely at the higher clock rate of the data processor or the lower clock rate of the address and data buses operate in the core-rate or bus-rate domains, respectively. The transfer-rate domain is used to transfer data from the core-rate to the bus-rate. Conversely, the receive-rate domain is used to transfer data from the bus-rate to the core-rate. The data synchronization system provides a general solution to the problem unreliable half cycle data paths.