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:
Nov. 30, 1993
Filed:
Apr. 03, 1989
David L Simpson, West Columbia, SC (US);
NCR Corporation, Dayton, OH (US);
Abstract
The subject invention is a FIFO memory system and method for buffering data between two data busses. The system comprises a RAM memory, write and read pointer registers, an offset generator, a programmable offset register, and a comparator. The write pointer register stores the address of the next data element to be written into the RAM memory, and the read pointer register stores the address of the next data element to be read from the RAM memory. The offset generator compares the contents of the registers, and generates at an output thereof an offset signal representing the amount of memory space occupied. The programmable offset register provides a programmed offset signal. The comparator compares the offset signal and the programmed offset signal, and provides a ready signal when the offset signal is greater than or equal to the programmed offset signal.