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. 28, 1994
Filed:
Apr. 13, 1993
Applicant:
Inventor:
Jonathan L Fasig, Rochester, MN (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
395325 ; 364D / ; 3649295 ; 36493547 ; 3649501 ;
Abstract
Disclosed is a bus expansion unit for extending the bus of a computer system which has an asynchronous bus cycle. The bus expansion unit includes an asynchronous state machine which uses a delay line to determine some of its states. The bus expansion unit recognizes the address and bus status and holds or latches a select signal. In addition, the bus expansion unit delays the -CMD signal until the peripheral has the opportunity to place valid data on a bus channel. In addition, the bus expansion unit includes an arbitration circuit for the peripheral attached thereto.