Distributed direct memory access provision within a data...

Details Distributed direct memory access provision within a data... Distributed direct memory access provision within a data...

2006-12-12

2010-10-26

Tsai, Henry W (Department: 2184)

Electrical computers and digital data processing systems: input/

Input/output data processing

Direct memory accessing

C710S038000, C710S305000

Reexamination Certificate

active

07822884

ABSTRACT:
An adaptor circuit20for peripheral devices14, 18is provided with a direct memory access manager38. This local direct memory access manager38is able to autonomously manage data transfers on behalf of its associated peripheral device14, 18. A computer program tools used to generate signal interconnects24is used to additionally specify whether a DMA capability is to be provided for a peripheral device14, 18, whereupon an adaptor circuit20, 22including a DMA manager38can be included within the signal interconnect. A DMA command signal is added to the interconnect signals being passed around the signal interconnect24and enables DMA command/configuration data to be distributed using the existing signal distribution infrastructure and addressed to the associated peripheral device14, 18of the target local DMA controller38. Existing software drivers can issue control information to a main central DMA controller6, which then passes this information on to a DMA Capable adaptor circuit20to manage the transfer concerned. Thus the present technique can be used without requiring software drivers to be rewritten.

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