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TMS320C6678: EDMA3 几个概念不是很理解

Part Number: TMS320C6678

关于提供的EDMA demo   edma_test.c中

/* Map the DMA Channel to PARAM Block 2. */
CSL_edma3MapDMAChannelToParamBlock (hModule, channelNum, 2);

/* Obtain a handle to parameter set 2 */
hParamPing = CSL_edma3GetParamHandle(hChannel, 2, &status);
if (hParamPing == NULL)
{
printf ("Error: EDMA Get Parameter Entry failed for 2.\n");
return -1;
}

按照注释是映射的PARAM Block  2中,可是阅读手册 edma  有64个通道,512个Param 参数集,没有发现块的概念,是先映射到block后,才能映射的参数集合?对这个概念不理解