Lsi Logic Corporation

Mark D Richards

David Neil Pether

A circuit for reducing the number of bits in a K bit value from K to N bits. The circuit generally comprises a first summing circuit, a control circuit, an error feedback circuit, a second summing circuit, and a processor. The first summing circuit may add an error offset value and the N&plus;m MSB's of the K bit value to produce a result data value. The control circuit may generate a dither offset value. The error feedback circuit may receive m LSBs of the result data value and generate an error value in dependence on the m LSBs. The second summing circuit may add the dither offset value and the error value to provide the error offset value. The processor may selectively control generation of the dither offset value and the error value.

Bit reduction using dither, rounding and error feedback

A method of transferring a block of graphics data for display on a screen along a data bus between a processing block and a plurality of addresses in memory comprising the steps of (A) generating a first and a second X and Y coordinate value for each of one or more portions of data to be transferred, (B) calculating a respective address in memory of the plurality of addresses corresponding to each of the first and second coordinate values, (C) accessing the addresses to effect the data transfer, (D) determining if a plurality of bus criteria are met and (E) enabling or inhibiting transfer of the block of data in a data burst in response to the plurality of criterias being met.

Growing community of inventors

Reading, United Kingdom

Mark D Richards