Apparatus and method for the exchange of signal groups between a plurality of components in a digital signal processor having a direct memory access controller

摘要

As the digital signal processor 30 has become more flexible, the direct memory access controller 32 has assumed greater computational power to permit the core processing unit to perform its specialized processing without responding to signal transfer requests. Not only does the direct memory access controller 32 control the exchange of signal groups between the memory unit 16 and the core processing unit 12, but the direct memory access controller 32 is also responsible for the transfer of signal groups within the digital signal processor that originate from the serial port 37, and the interface unit 34 (the unit that implements the direct transfer of signal groups from the memory unit of one digital signal processor to a second signal processor). The direct memory access controller 32 has programmable channels 326 that permit the signal group source component to be coupled to the signal group destination component. The address unit 3251 of the direct memory access unit 32 must be able to accommodate a plurality of addressing modes. An arbitration unit 323 prevents conflict between the components. With respect to the host port interface unit 34, the exchange of the signal groups with the memory unit is performed by a direct transfer, the direct memory access controller preventing conflicting signal groups transfers.