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On The Fly Rearrangement of Area Formatted Data for Display Refresh

IP.com Disclosure Number: IPCOM000086147D
Original Publication Date: 1976-Jul-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Overhouse, LE: AUTHOR

Abstract

To maintain high-data rates to large displays with high resolution, information sent to the display must be organized in line format, that is, arranged so that the maximum bandwidth is obtained along horizontal lines. However, it is often the case that the best cost performance is obtained when the data is arranged in storage as a small area of X by Y bits (area format). Having data stored in area format while supplying data to a display which requires line format is incompatible. The incompatibilities of area and line format are resolved by this apparatus.

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On The Fly Rearrangement of Area Formatted Data for Display Refresh

To maintain high-data rates to large displays with high resolution, information sent to the display must be organized in line format, that is, arranged so that the maximum bandwidth is obtained along horizontal lines. However, it is often the case that the best cost performance is obtained when the data is arranged in storage as a small area of X by Y bits (area format). Having data stored in area format while supplying data to a display which requires line format is incompatible. The incompatibilities of area and line format are resolved by this apparatus.

Data is maintained in area format for processing while an on-the-fly process rearranges area format data into line format, and provides the necessary bandwidth for refreshing the display. Rearrangement is a continuous process and operates concurrently with the processing of area formatted data.

As shown in the diagram, data is sent to the consolidation logic 20 from several sources 12, 14, 16 where it is logically combined and forwarded to rearrangement buffers 22, 24. Each of the sources supply area formatted data from the same portion of the image 10 in synchronism. The rate at which data must be supplied is equal to that required to refresh the display.

The area words are placed in consecutive locations of the rearrangement buffer 1. When the first buffer 22 is full, the area words are sent to the second buffer 24. While the second buffer i...