Raster operation apparatus for executing a drawing arithmetic op

Details Raster operation apparatus for executing a drawing arithmetic op Raster operation apparatus for executing a drawing arithmetic op

1993-09-24

1995-12-26

Powell, Mark R.

395162, G06F 1200

Patent

active

054796059

ABSTRACT:
When windows are synthesized or the like in different frame memories or in the same frame memory, source data on the shifting side and destination data on the shift destination side are read out. After the source data was shifted so as to match the data positions, a bit arithmetic operation is executed between the shifted source data and the destination data. Four source data registers, two destination registers, and two bit operating sections are provided. The source data stored in a certain source register is shifted and a bit arithmetic operation is executed between the shifted source data and the destination data. In parallel with the bit arithmetic operation, the source data to be processed next is read out from the frame memory and stored into the source register. No idling state occurs in the memory access of the source data.

REFERENCES:
patent: 4752893 (1988-06-01), Guttag et al.
patent: 4845656 (1987-07-01), Nishibe et al.

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