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:
Jun. 01, 1976
Filed:
Dec. 20, 1974
William J Hurley, Poughkeepsie, NY (US);
Hans P Muhlfeld, Highland, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A large scale integrated (LSI) chip or semiconductor device includes a memory array and associated logic circuitry. The array is 'embedded' in the sense that it is not directly accessible, either in whole or in part, from the input and output terminals or pads of the device. To facilitate testing there is added to the device gating means to the memory array and wiring extending from primary access points of the device to the memory array bypassing and in parallel with the logic circuitry. The device further includes control means operatively associated with the gating means for switching the input to the array between the logic circuitry and the primary access points. In the latter condition direct access to the array is permitted, thereby facilitating testing.