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TMS320C6657: EDMA的ping-pong传输部分代码疑问

Part Number: TMS320C6657

您好:

在看到之前的帖子里有人提出疑问:

EDMA在进行pingpong 时link - 处理器论坛 - 处理器 - E2ETm 设计支持 (ti.com)

请问这段代码怎么理解

 /* Interrupt enable (Bits 0-1)  for the global region interrupts */

  regionIntr.region = CSL_EDMA3_REGION_GLOBAL;

  regionIntr.intr   = 0x3;

  regionIntr.intrh  = 0x0000;

实际上,我在调试TI例程edma_ping_pong_xfer_gbl_region函数的时候,也产生了这个疑问,求解答,急!!