Linear address conversion

Details Linear address conversion Linear address conversion

1989-06-15

1991-09-10

Clark, David L.

Boots, shoes, and leggings

364518, 340799, G06F 1210, G06F 314, G09G 102

Patent

active

050479580

ABSTRACT:
A graphics subsystem (10) employs an image memory (12) that includes an on-screen part (44) and an off-screen part (46). The locations of the on-screen memory (44) are continually scanned to provide data to be displayed on a display device (16). The off-screen part (46) stores data that represent image segments that have been occluded by windowing. To transfer data between the on-screen part (44) and the off-screen part (46), an address generator (24) generates a sequence of two-dimensional addresses representing the two-dimensional positions of the pixels whose data are to be transferred. These addresses are converted to one-dimensional addresses by a simple circuit consisting of multiplexers (26 and 28), adders (30 and 32) and a multiplier (34).

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