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:
Oct. 27, 1987
Filed:
Aug. 26, 1986
Nobuhiko Yamagami, Tokyo, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
In a graphic display apparatus having a digital differential analyzer (DDA), a chrominance data stored in a register is written in an area of a bit map memory defined by coordinates generated from DDA by a write control circuit in response to ARDY signal. A first flip-flop is reset by a busy signal from the write control circuit and is set by a load signal. When the first flip-flop is in a reset state, a first gate produces PRDY signal requesting a microprocessor to load the chrominance data in the register in response to RDY signal indicating completion of a coordinate setting operation from DDA. When the first flip-flop is in a set state, a second gate generates CRDY signal in response to RDY signal. CRDY and RDY signals are supplied to a selector which selects one of them due to a second flip-flop for switching a line processing mode and a raster operation mode, and supplies the selected signal to the write control circuit to thereby perform write operation.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile