Video graphics controller having locked and unlocked modes of op

Details Video graphics controller having locked and unlocked modes of op Video graphics controller having locked and unlocked modes of op

1997-11-14

1999-11-09

Lao, Lun-Yi

Computer graphics processing and selective visual display system

Computer graphic processing system

Interface

345132, 345507, 711219, G09G 500

Patent

active

059823976

ABSTRACT:
A video graphics controller (VGC) for communicating with a frame buffer memory and a display device includes a first-in, first-out (FIFO)-configured memory, a memory controller for communicating with the frame buffer memory and controlling the FIFO-configured memory, and read and write pointers for the FIFO-configured memory. A subtractor is coupled to the read and write pointers for generating a difference signal which is coupled to the memory controller, and the read pointer generates a read carrier signal which is provided to a lock detector along with an end-of-frame signal. The lock detector generates an output signal which is coupled to the memory controller in order to place the video graphics controller in a locked mode of operation if no read carry signal is generated during an inputting of an entire frame of information into the FIFO-configured memory, and in an unlocked mode of operation if a read carry signal is generated prior to the completion of the inputting of an entire frame of information.

REFERENCES:
patent: 4454507 (1984-06-01), Srinivasan et al.
patent: 4546451 (1985-10-01), Bruce
patent: 4706074 (1987-11-01), Muhich et al.
patent: 5097442 (1992-03-01), Ward et al.
patent: 5379399 (1995-01-01), Conway-Jones et al.
patent: 5471583 (1995-11-01), Au et al.
patent: 5473756 (1995-12-01), Traylor

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