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:
Feb. 10, 1998
Filed:
Oct. 26, 1994
William Gordon Dobson, Douglasville, GA (US);
Hayes Microcomputer Products, Inc., Norcross, GA (US);
Abstract
An improved input/output FIFO buffering device with expanded buffers for a universal asynchronous receiver/transmitter (UART) that includes scalable trigger levels for generation of an external service request is disclosed. Standard selectable trigger levels used in a type 16550 UART are provided as well as expanded scalable trigger levels to accommodate the larger buffers. The larger scalable trigger levels may be employed in a manner transparent to an application written for 16 byte buffers so as to physical accommodate higher data rates without requiring applications to know that more buffer space is used. A reinterruptable timer inhibits generation of an interrupt service request until a predetermined period of time after the most recent interrupt request has been serviced. The period of the timer is selectively programmable.