Packet transmission and reception via a shared dma channel

Details Packet transmission and reception via a shared dma channel Packet transmission and reception via a shared dma channel

H - Electricity

04

L

340/81

H04L 5/14 (2006.01)

Patent

CA 1240752

PACKET TRANSMISSION AND RECEPTION VIA A SHARED DMA CHANNEL Abstract of the Disclosure A DMA channel is shared by transmit and receive ports via which data packets are transmitted and received using a bit oriented protocol such as HDLC. For the transmission of each packet, an abort signal of the protocol is initially transmitted, and the packet is transmitted when the DMA channel is free after a delay equal to the packet transmission turnaround time. In response to receipt of the abort signal, the DMA channel is reserved for reception of a packet within a time-out period. The DMA channel adopts a receive state in response to the abort signal either immediately if it is free, or at the end of transmission if a packet is currently being transmitted. - i -

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