A DMA controller has both a receiving portion and a sending portion and may be used in a modem or other data transmission context. The DMA controller is intended to provide to or receive from data samples on a bus that may or may not be available. For the case when the bus is available, samples of data...http://www.google.fr/patents/US6792481?utm_source=gb-gplus-shareBrevet US6792481 - DMA controller
