Browse Prior Art Database

Method to Increase Utility of Video Adapters

IP.com Disclosure Number: IPCOM000109546D
Original Publication Date: 1992-Sep-01
Included in the Prior Art Database: 2005-Mar-24
Document File: 2 page(s) / 87K

Publishing Venue

IBM

Related People

FitzGerald, RL: AUTHOR [+2]

Abstract

Described is a hardware implementation designed to increase the utility of video adapters, as applied to personal computers (PCs). The design utilizes group signals so as to provide the ability to use either dynamic random access memory (DRAM) or video random access memory (VRAM) devices in a subsystem.

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Method to Increase Utility of Video Adapters

       Described is a hardware implementation designed to
increase the utility of video adapters, as applied to personal
computers (PCs).  The design utilizes group signals so as to provide
the ability to use either dynamic random access memory (DRAM) or
video random access memory (VRAM) devices in a subsystem.

      In the design of video subsystems, the type of memory device
used to store the display image, either DRAM or VRAM, can restrict
the use of the subsystem to particular applications.  In prior art,
the subsystem was designed separately so as to use either DRAM for
low-cost or VRAM for high-performance applications.  The concept
described herein provides a means whereby the video subsystem can
support either type of device in a single subsystem.  This enables
the video subsystem to be used in more applications.

      Fig. 1 shows the logic block diagram of the DRAM configuration
and Fig. 2 shows the logic block diagram of the VRAM configuration.
Three groups of signal pins are used to control the storage memory
interface: one signal group consists of a single signal that
indicates which type of device was being used; a second group of
signals provides the common function between the DRAM and the VRAM
implementations.  These signals include address lines, data lines,
and some control lines.  A third group of signals are dual-function
signals where the specific function is determined by the type of
me...