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, 1999
Filed:
Oct. 22, 1997
Pidugu L Narayana, Starkville, MS (US);
Andrew L Hawkins, Starkville, MS (US);
Cypress Semiconductor Corp., San Jose, CA (US);
Abstract
The invention concerns an asynchronous state machine with a programmable tSKEW which may be used to generate a half-empty and half-full flags in a synchronous FIFO buffer. The present invention may reduce the delay associated in producing the half-full or half-empty flags from a typical eight gate delays, to as little as no gate delays. The reduction may be accomplished by using a first state machine which can make an internal flag go low, or active, and a second state machine which can make the internal flag go high, or inactive. The functioning of the first and second state machines may be controlled by a blocking logic. The output of each of the state machines may be stored in a latch. The output of the latch may be presented to an input of the blocking logic, which may be used by the blocking logic to control the activity of the state machines.