Computer graphics processing and selective visual display system – Computer graphic processing system – Plural graphics processors
Patent
1995-05-15
1999-01-12
Hjerpe, Richard A.
Computer graphics processing and selective visual display system
Computer graphic processing system
Plural graphics processors
395842, 39520042, G09G 500
Patent
active
058596496
ABSTRACT:
A data processing system (20) has a display controller (28) that uses bus arbitration and data bursting to supply display data for refreshing an LCD screen (49), utilizing a system memory (30) instead of a separate video RAM. A screen DMA (58) fills a line buffer (60) with display data from the system memory (30) in bursts of a predetermined number of words. The screen DMA (58) receives a faster clocking signal than is used by the CPU (22). This allows the screen DMA (58) to run faster than the CPU (22) to reduce bandwidth needed to retrieve the display data. In addition, if the CPU (22) clock frequency is changed for power management purposes, the LCD screen (49) is not affected since it uses a different clock. By using the system memory (30) for storing display data, pin count, packaging costs, and board space are reduced.
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Chu Andrew
Yiu Hing Leung
Zoerner Glen
Hill Daniel D.
Hjerpe Richard A.
Motorola Inc.
Osorio Ricardo
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