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. 22, 1989
Filed:
Jan. 25, 1988
Hans J Mattausch, Kirchheim, DE;
Siemens Aktiengesellschaft, Berlin and Munich, DE;
Abstract
In a dual port RAM having separate address controls, write/read paths and pre-loading circuits for each of the two input/output terminals, conflict situations are avoided when addressing a memory cell via the address controls of both input/outputs, through use of a clock circuit (20) which respectively alternately selects the address controls (8, 10, 9, 11) and the pre-loading circuits (16, 17) so that the address control (8, 10) for the first input/output (DEA1) and the pre-loading circuit (17) for the data lines (LP.sub.P2) allocated to the second input/output (DEA2) are activated during a first clock phase, and the address control (9, 11) of the second input/output (DEA2) and the data lines (LP.sub.P1) allocated to the first input/output (DEA1) are activated during a second clock phase.