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:
Sep. 26, 2000
Filed:
Dec. 19, 1995
Digital Equipment Corporation, Maynard, MA (US);
Abstract
A duplicate cache tag store, accessible to a graphics processor and to devices connected to the I/O bus without creating traffic on the system bus. Any entry into, or displacement from, the CPU cache tag store is also entered into, or displaced from, the second cache tag store. The disclosure further describes a computer graphics system, having a graphics processor capable of reading from or writing to main memory, including virtual memory, without any action by the CPU; having a FIFO command buffer in main memory for temporary storage of graphics commands; having a residue buffer for the temporary storage of memory transmissions not immediately usable by the graphics processor; having a 'short circuit' feature for routing graphics commands to the command processor in the minimum number of steps; having a cursor control system capable of storing cursor pattern information in, and retrieving cursor pattern information from, main memory; having a cursor bus that is reconfigurable to carry information other than cursor information; and having a frame buffer module that contains no timing or cursor control circuitry.