| 摘要 |
PURPOSE:To add commands with a single and simple procedure independently of the state of a channel to a chained DMA command by providing a final pointer pointing a final discriptor to the channel. CONSTITUTION:The final pointer pointing final discriptors 4-1, 2 is provided to the channel, a new discriptor to be added is prepared, and when processing commanded by a chained discriptor is executed upon the receipt of a notified chain restart command, the chain restart command is neglected, the new discriptor is processed, and when the processing is waiting for the position of the discriptor pointed by the final point register 5, after chain bits 2-1-3 provided in the final discriptor pointed in the final point register are on '1' level, the processing commanded by the discriptor provided newly is controlled for the execution.
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