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Techniques for Dynamic RAM Bandwidth Utilization

IP.com Disclosure Number: IPCOM000044676D
Original Publication Date: 1984-Dec-01
Included in the Prior Art Database: 2005-Feb-06

Publishing Venue

IBM

Related People

Authors:
Bowater, RJ Bresenham, JE Butler, ND Buttimer, MD [+details]

Abstract

This article discloses techniques for the efficient use of the limited bandwidth available for updating a raster scan display dynamic RAM (random-access memory). The RAM has to be updated and refreshed during video flyback so the time available is extremely short. The three techniques combined for efficient storage utilization are: only those memory chips required to be modified have their write enable inputs activated; bit planes are organized in two interleaves of 8 bits each; page mode is associated with 2-way interleave. High resolution raster (frame) buffer display systems usually operate in a 'single buffered' mode where a single RAM store is used for continuous video display, with updating of the store taking place in the video flyback (or blanking times).