Boots – shoes – and leggings
Patent
1990-05-14
1991-01-29
Anderson, Lawrence E.
Boots, shoes, and leggings
3642318, 36424292, 364229, G06F 938, G06F 1316
Patent
active
049891383
ABSTRACT:
Stages of a graphics data processing pipeline are interconnected by a common bus for conveying data and arbitration signals to and from each stage. Each data transmitting stage arbitrates for and acquires control of the bus when it has output data to transmit to an addressable storage location within a next stage. Each pipeline stage other than a first stage generates a BUSY bit indicating whether it is processing data or awaiting new input data from its preceding stage. When one pipeline stage has output data to transmit to a next pipeline stage, the transmitting stage periodically polls the receiving stage by acquiring control of the bus and placing on the bus a particular address associated with the next stage. Whenever the next stage detects the presence of the particular address on the bus, it places its BUSY bit on the data lines of the bus. When the sending stage determines from the state of the BUSY bit that the next stage is ready to receive input data, the sending stage acquires control of the bus and sends the input data thereon to the next stage.
REFERENCES:
patent: 4542455 (1985-09-01), Demeure
Anderson Lawrence E.
Dellett John P.
Tektronix Inc.
Winkelman John D.
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