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. 16, 1976
Filed:
Nov. 13, 1974
Guenter F Krumbach, Huntington Beach, CA (US);
Communication Mfg. Co., Long Beach, CA (US);
Abstract
A first-in/first-out memory device has a shift register with a storage capacity of n stages in which data units can be stored, and a modulo-n address counter having one state representing each stage of the shift register. In one embodiment designed for fast data storage, a data unit is transferred to the input of the shift register, during a write mode, and the state of the address counter is advanced for each data unit so transferred; during a read mode, data units are recirculated from the output of the shift register to its input, the shift register is shifted n times, the state of the address counter is advanced n - 1 times, and the data unit appearing at the output of the shift register when the address counter state represents an empty shift register is retrieved. In another embodiment designed for fast data retrieval, a data unit is retrieved from the output of the shift register during a read mode and the state of the address counter is advanced for each data unit so transferred; during a write mode, data units are recirculated from the output of the shift register to its input, the shift register is shifted n times, the state of the address counter is advanced n - 1 times, and a data unit is stored in the input of the shift register when the address counter state represents a full shift register.