| 摘要 |
<p>A direct memory access controller coupled to a system bus (36, 37, 38) of a system including a memory (2, 3), for controlling a data transfer by a direct memory access, includes a register (11) registering a code which designates one of a plurality of descriptor formats, each of which defines both the number and type of descriptors necessary for the data transfer by the direct memory access, a group of registers (19 - 23) for registering descriptors defined in one of the descriptor formats which is selected by the code registered in the register, a controller (16 - 18) for controlling the data transfer by the direct memory access in accordance with the descriptors defined in the selected one of the descriptor formats registered in the register (11).</p> |
