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:
Aug. 10, 1993
Filed:
Nov. 26, 1990
Applicant:
Inventors:
John B McNesby, Mesa, AZ (US);
David C Crohn, Munich, DE;
Assignee:
Siemens Aktiengesellschaft, Berlin and Munich, DE;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ; G06F / ;
U.S. Cl.
CPC ...
371 62 ; 371 61 ; 371 571 ;
Abstract
A system for determining the presence or absence of data on one or more data lines including a flip-flop for each data line with the output of each flip-flop connected to a NAND gate. The NAND gate is connected through an OR gate to two output flip-flops in series. The logic of the system is such that the output of the second of the two output flip-flops provides a signal level which is high or low depending on whether data is present on all of the data lines or one or more lines has no data.