INFORMATION PROCESSOR, INFORMATION PROCESSING METHOD, PROGRAM FOR IMPLEMENTING THIS INFORMATION PROCESSING METHOD, MEDIUM FOR RECORDING THIS PROGRAM, DMA CONTROLLER, DMA TRANSFER METHOD, PROGRAM FOR IMPLEMENTING THIS DMA TRANSFER METHOD, AND MEDIUM FOR RECORDING THIS PROGRAM

摘要

PROBLEM TO BE SOLVED: To read descriptor information without requiring access to the storage part of an information transfer system that takes processing time and to increase processing speeds.;SOLUTION: A DMA transfer part of a network card 9 accesses a RAM and copies (transfers) the content of a descriptor number nic_tx into an area on the RAM designated by a register TX_DONE_ADR used for setting the head address of a transmission completion pointer storage area (815). When a transmission completion interrupt is input from an interrupt generating part, a transmission completion process thread determines a transmission completion pointer based on a transmission descriptor nic_desc related to the descriptor number nic_tx copied into the RAM. Thereafter, the transmission completion process thread performs a transmission completion process from a transmission head pointer to a transmission completion pointer in order.;COPYRIGHT: (C)2009,JPO&INPIT