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:
May. 12, 1987
Filed:
Jul. 23, 1984
Robert C Thaden, Houston, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A video memory and display (CRT) controller circuit on a single semiconductor substrate controls a DRAM (dynamic random access memory) used as a video memory and a CRT display. The video memory and display controller is normally a part of a video system which includes a data processor, video memory and a CRT display. The video memory and display controller includes a row address latch for storing a row address, a column address latch for storing a column address, display address logic which generates row and column addresses for display update ad refresh logic which generates row addresses for the required periodic DRAM refresh. A multiplexer provides the application of the proper address to the address bus of the DRAM. The display controller circuit is responsive to the data processor data bus for generating display control signals for control of the CRT display.