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:
Oct. 31, 1989
Filed:
Oct. 29, 1986
William M Johnson, Leander, TX (US);
Charles G Wright, Round Rock, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
In a data processing system, particularly one implemented by a microprocessor, apparatus is provided for bypassing the main parallel information bus between the processor and main storage unit by a serial information bus for testing purposes. Serial test information is applied through the serial information bus to a storage control unit which interfaces the processor and storage unit. The control includes circuitry for converting the information from the serial bus into the parallel format of the data which is provided from the processor along the main parallel bus. The test information applied has the same commands and address structure as the information output from the central processor. As a result, when the serial test information is converted to parallel format, by the apparatus, it will be indistinguishable from parallel data applied directly from the processor along the parallel bus.