Computer graphics processing and selective visual display system – Computer graphic processing system – Interface
Reexamination Certificate
2000-06-14
2004-05-11
Bella, Matthew C. (Department: 2676)
Computer graphics processing and selective visual display system
Computer graphic processing system
Interface
C345S538000
Reexamination Certificate
active
06734862
ABSTRACT:
BACKGROUND
The invention relates to memory controller hubs.
Microcomputer systems generally include one or more memory controller hubs that control and coordinate the transfer of data between the computer's system memory, central processing unit (CPU), and peripheral devices. Graphics applications may be supported by peripheral devices known as graphics controllers that require a memory controller hub to transfer data between the devices, the system memory, and the CPU.
A design concern associated with microcomputer systems is the quality of two-dimensional (2D), three-dimensional (3D), and video image (often collectively referred to below as “graphics”) processing. High-performance graphics processing requires processor-intensive calculations and the fast manipulation of large quantities of data. Several designs have been implemented to achieve high-performance graphics processing while also reducing the cost of the complete system and allowing for upgrades to the computer system's capability.
A computer system may include a graphics controller coupled to local memory for storing graphics data, so that the amount of data that must be transferred between the graphics controller and the system memory and/or the CPU is reduced. Increasing the amount of local memory available to the graphics controller improves graphics performance, but also increases the cost of the computer system, since local graphics memory is relatively expensive. Less local memory is required to achieve the same graphics performance, however, if a dedicated bus, e.g., an Accelerated Graphics Port (AGP), is used to couple the controller to the memory controller. An AGP allows the controller to treat portions of system memory as dedicated local graphics memory, which reduces the amount of local memory required and lowers overall system costs.
Computer system costs may also be reduced by eliminating the peripheral graphics controller and integrating its functionality into the memory controller hub. In such a configuration the memory controller hub is better described as a graphics/memory controller hub (GMCH), since it performs graphics processing functions in addition to memory control and transfer functions. Additionally, it includes one or more output ports to send graphics signals to external devices, such as cathode ray tubes (CRTs) and flat-panel monitors. Local graphics memory may then be eliminated.
REFERENCES:
patent: 5793996 (1998-08-01), Childers et al.
patent: 5941968 (1999-08-01), Mergard et al.
patent: 6069638 (2000-05-01), Porterfield
patent: 6097402 (2000-08-01), Case et al.
patent: 6148357 (2000-11-01), Gulick et al.
patent: 6208273 (2001-03-01), Dye et al.
patent: 6275240 (2001-08-01), Riffault
patent: 6304244 (2001-10-01), Hawkins et al.
patent: 6374317 (2002-04-01), Ajanovic et al.
patent: 6477623 (2002-11-01), Jeddeloh
patent: 6480200 (2002-11-01), Fisher et al.
patent: 6496193 (2002-12-01), Surfi et al.
patent: 6532019 (2003-03-01), Gulick et al.
patent: 6593932 (2003-07-01), Porterfield
patent: 0 766 177 (1997-04-01), None
patent: 0 902 355 (1999-03-01), None
patent: 0326275 (1999-06-01), None
patent: 436694 (2001-05-01), None
patent: WO 99/28893 (1999-06-01), None
patent: WO 99/34293 (1999-07-01), None
patent: WO 00/29934 (2000-05-01), None
VIA Technologies, Inc. Manual,VIA ProSavage™ PM133, http://www.via.com.tw/products/prodpm133.htm; Jan. 19, 2001.
VIA Technologies, Inc. Manual,VIA ProSavage™ PM601, http://www.via.com.tw/products/prodpm601.htm; Jan. 19, 2001.
VIA Technologies, Inc. Manual,VIA APOLLO MVP4, http://www.via.com.tw/products/prodpm601.htm; Jan. 19, 2001.
Blodgett Cass A.
Chapple James S.
Dever Tom E.
Langendorf Brian K.
Puffer David M.
Bella Matthew C.
Fish & Richardson P.C.
Singh Dalip K.
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