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International Business Machines Corporation

Lisa L Fischer

Stephen Dale Hanna

David E Finlay

Pipelined image data transfer which tessellates and quads the data while transferring. The output data from the transfer can be selectively in quad or linear format. Such tessellating and formatting is performed in-line using alternate buffers for pipelining so that there is effectively no delay for performing the operations. The operations are performed by unique input and output buffer and image storage addressing.

Tessellating and quadding pels during image transfer

Bus master for use in computer system includes logic for determining the number of words remaining to be transferred in a DMA operation to supply signals to permit arbitration to start for the next DMA request, thereby avoiding an idle cycle. A timeout state machine is also included to prevent the bus master state machine from hanging in a state with no exit. Errors can be masked to permit analysis of system problems.

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Boulder, CO, United States of America

Lisa L Fischer