BRIEF DESCRIPTION OF THE DRAWINGS
Other objects and further features of the present invention will become more apparent from the following detailed description when read in conjunction with the accompanying drawings:
FIG. 1 shows a general configuration of a file control system according to one embodiment of the present invention;
FIGS. 2 through 4 show a sequence diagram illustrating data transfer operation in the file control system shown in FIG. 1;
FIG. 5 shows a block diagram illustrating a function of a DMA controller included in each central module included in the file control system shown in FIG. 1;
FIG. 6 illustrates an example of a header format of a data transfer packet in the file control system of FIG. 1;
FIG. 7 shows a sequence diagram illustrating DMA transfer operation (regular occasion) executed by the DMA controller shown in FIG. 5;
FIGS. 8 through 10 show a sequence diagram illustrating DMA transfer operation (time out occasion) executed by the DMA controller shown in FIG. 5;
FIGS. 11 through 15 show flag assigning operation executed by the DMA controller of FIG. 5;
FIGS. 16 through 18 show a sequence diagram illustrating the flag assigning operation executed by the DMA controller of FIG. 5;
FIGS. 19 through 22 show flag assigning operation executed by the DMA controller of FIG. 5 when data reading requests are received successively; and
FIGS. 23 through 27 show a sequence diagram illustrating the flag assigning operation executed by the DMA controller of FIG. 5 when data reading requests are received successively.
Patent Application
20070220179
