Computer graphics processing and selective visual display system – Display driving control circuitry – Controlling the condition of display elements
Patent
1994-11-10
1998-02-03
Powell, Mark R.
Computer graphics processing and selective visual display system
Display driving control circuitry
Controlling the condition of display elements
395501, 395509, 395512, 395519, 395526, 395376, 345202, 345203, G06T 160, G06F 1576
Patent
active
057154376
ABSTRACT:
A CPU introduces software commands to a first limited capacity memory (e.g. FIFO), on an integrated circuit chip. Data (e.g. graphics) from a first portion of a second memory (off chip) is processed in accordance with such commands. A second portion (e.g. FIFO) of the second memory may also store commands normally passing from the CPU through the first memory. When the first memory becomes full, the commands may pass from the CPU through the second portion of the second memory (which may have a storage capacity considerably greater than that of the first memory) and then through the first memory. The commands may continue to flow in this auxiliary path until the second portion of the second memory becomes empty. A third memory of a limited capacity on the chip may pass the commands from the CPU to the first memory in the normal operation or to the second portion of the second memory when the first memory becomes full. The CPU may also pass commands to other peripheral equipment while a ready line is high. When low, the ready line prevents commands from passing to the peripheral equipment while the third memory is full. However, a command may pass from the third memory to the first or second memory to make the ready line high. A counter indicates the number of commands in the first and third memories and the second portion of the second memory. Software occasionally interrogates the counter to update in the software the number of commands in the counter.
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Asal Michael D.
Baker David C.
Brooktree Corporation
Cray William C.
Oh Susie H.
Powell Mark R.
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