The SPEs access main storage with directmemoryaccess (DMA) commands that move data and instructions between main storage and a private local memory, called a local store or local storage (LS).
The first copy (see Figure 1) is performed by the directmemoryaccess (DMA) engine, which reads file contents from the disk and stores them into a kernel address space buffer.
The hardware chapter introduces the external memory module and video I/O module, programs video-driver for the DM642 by using CSL, discuss the applications of interrupt and directmemoryaccess (DMA).