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:
Dec. 06, 1994
Filed:
Aug. 09, 1993
Kumar Chinnaswamy, Milford, MA (US);
Michael A Gagliardo, Shrewsbury, MA (US);
John J Lynch, Wayland, MA (US);
James E Tessari, Arlington, MA (US);
Digital Equipment Corporation, Maynard, MA (US);
Abstract
Methods and apparatus for reducing memory read latency for selected data requested by one central processing unit (CPU) and retrieved from another CPU through a system control unit (SCU) with special data transfer cycles. The special data transfer cycles include a first dual operation mode which confirms that the transferred data is the most current and then concurrently write the CPU transferred data into the SCU main memory while transferring it directly to the requesting CPU, and a second dual operation mode which confirms that only a portion of the transferred data is the most current and then concurrently write the portion of the transferred data that is most current in the SCU memory and read the written data for transfer to the requesting CPU.