Video graphics display memory swizzle logic and expansion circui

Details Video graphics display memory swizzle logic and expansion circui Video graphics display memory swizzle logic and expansion circui

1989-07-28

1993-08-03

Harkcom, Gary V.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

395164, 340799, G06F 1200

Patent

active

052336905

ABSTRACT:
A circuit controls the reordering of data as it is transferred to control a memory. The data to be reordered is presented such that the ordinate bit position within a data word is uniquely associated with a particular input to a data bus. The bus inputs, however, are connected to the VRAM in an arrangement contrary to the desired ordinate association with the compressed data word. A single swizzle logic circuit operates to allow graphic compressed data to be reordered for presentation to the block-write inputs of a VRAM regardless of the VRAM or pixel size. The circuit relies upon properly expanding the compressed data prior to the actual reordering of the ordinate positions of the data bits. A method for controlling the reordering of data also is described.

REFERENCES:
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K. Takuji, "Picture Enlarging Device", Matsushita Electric Ind. Co., Ltd., Patent Abstract of Japan, Sep., 5, 1988, Application No. JP860251124.

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