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:
Dec. 01, 1998
Filed:
Oct. 24, 1997
Mamoru Nagamoto, Tokyo, JP;
NEC Corportion, , JP;
Abstract
In a main signal memory supervisory control system which comprises a parity generator, a parity detector, a write address counter and a read address counter, a state management section, a down counter, and a change point detector are arranged as memory supervising means. In this memory supervisory, a state management section receives address generation notifications from the write address counter and the read address counter to calculate and outputs the data accumulation amount of the main signal memory, a down counter subtracts a counter by the read address, sets a predetermined value of a data amount in advance, outputs a change notification when a counter value changes from numerical value '1' to numerical value '0', and loads the predetermined value on the counter, and a change point detector sends an odd-even switching signal of a parity when the change point detector receives the change notification. As a result, an odd-even alternative switching operation for a supervisory parity can be performed even in a memory write system such as an ATM communication system using only effective data, so that supervisory performance for the main signal memory can be improved.