Computer system with efficient DRAM access

Details Computer system with efficient DRAM access Computer system with efficient DRAM access

1995-06-07

1998-06-16

Tung, Kee M.

Computer graphics processing and selective visual display system

Computer graphic processing system

Interface

345501, 345507, G06F 1316

Patent

active

057678669

ABSTRACT:
A computer system includes one or more display devices, such as a cathode ray tube (CRT) or liquid crystal display (LCD) for providing a visible display to a user of the computer system. The computer system includes a video display controller (VDC) with a graphics generator. This VDC receives image information, such as text or graphics generated by a processor (CPU) or retrieved by the CPU from another facility (such as a CD-ROM) of the computer system, and provides signals driving one or both of the CRT or LCD displays. The VDC includes a sequencer and controller (SEQC) for a dynamic random access memory (DRAM) which is interfaced with the VDC. The SEQC arbitrates requests from various devices of the computer system for access to the DRAM, and facilitates these access according to a multi-tiered priority scheme. Accordingly, more efficient access to the DRAM is insured for the various devices of the computer system, and utilization of the DRAM, as well as the time of devices which are sometimes required to wait for access to the DRAM is improved.

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patent: 5349449 (1994-09-01), Omi et al.
patent: 5450542 (1995-09-01), Lehman et al.

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