Line buffer apparatus with an extendible command

Details Line buffer apparatus with an extendible command Line buffer apparatus with an extendible command

1996-11-19

1998-07-14

Tung, Kee M.

Computer graphics processing and selective visual display system

Display peripheral interface input device

Light pen for fluid matrix display panel

345507, G09G 500

Patent

active

057811822

ABSTRACT:
A line buffer apparatus with an extendible command queue length, includes a first level command queue for receiving commands from a computer; a line buffer for temporarily receiving video data or a command queue, the line buffer including a data input port and a data output port; a first multiplexer and a second multiplexer respectively connected to the data input port and the data output port of the line buffer for operatively enabling the line buffer to receive command data coming from a first level command queue or video data coming from a memory, and to output data into a graphic engine or a two dimensional operating device; a controller for controlling the two multiplexers to selectively connect the line buffer between the first level command queue and the graphic engine so as to treat the line buffer as a second level command queue when the line buffer does not temporarily store video, thereby flexibly extending the command queue length of an video window accelerator.

REFERENCES:
patent: 5023776 (1991-06-01), Gregor

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