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. 21, 1997
Filed:
Jun. 07, 1995
Applicant:
Inventors:
John J Carey, Raleigh, NC (US);
Fred Parnell, Raleigh, NC (US);
Jeffrey Buchanan Williams, Cary, NC (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02H / ;
U.S. Cl.
CPC ...
361118 ; 361119 ; 361115 ;
Abstract
A circuit senses an insertion of an adapter card into a connector coupled to a processor by an MCA bus and signals control logic, which forces all other adapter cards coupled to the MCA bus off of the bus with a preempt signal, driving the bus into an arbitration mode. This may be done while the system is powered. An analog switch divides the preempt signal into one that goes to the adapter cards and a second one that is sent to the processor so that it can perform memory refresh cycles.