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US 6,661,421 B1Granted
Methods for operation of semiconductor memory
AssigneeMitsubishi Electric & Electronics USA, Inc.
InventorElizabeth J. Schlapp
Life of this patent
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Abstract
Methods for operating a frame buffer memory device are disclosed which provide for accelerated rendering of two-dimensional and three-dimensional images in a computer graphics system One disclosed operation is a method for compressing data to be transmitted from a controller to the memory device and then decompressing the data within the memory device once it has been transmitted and received.
Claims3
A method for compressing pixel data transmitted from a controller to a memory, the method comprising the steps of:
- storing in both the controller and the memory old pixel data corresponding to a plurality of old pixels, which old pixel data comprises a set of old pixel components for each old pixel represented by the old pixel data;
- calculating, in the controller, new pixel data for a plurality of new pixels, which new pixel data comprises a set of new pixel components for each new pixel represented by the new pixel data;
- calculating, in the controller, the differences between certain pixel components of the new pixel data and certain pixel components of the old pixel data;
- calculating, in the controller, the differences of the previously calculated differences between certain pixel components of the new pixel data and certain pixel components of the old pixel data;
- determining, in the controller, a compression format based on the calculated differences and the calculated differences of the differences;
- compressing the new pixel data by formatting the calculated differences and the calculated differences of the differences into the determined compression format in the controller;
- transmitting the compressed new pixel data from the controller to the memory;
- and
- decompressing the new pixel information within the memory.
6 more elements
Dependencies are inferred from the claim text.