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EDMA3 channel in CSL structure CSL_Edma3ChannelAttr

Hello!

I am a beginner with C66x. My DSP is C6657.

I have a question about the structure CSL_Edma3ChannelAttr, which using in EDMA3 CSL function
CSL_edma3ChannelOpen (   
    CSL_Edma3ChannelObj*    pEdmaObj,
    CSL_InstNum             edmaNum,
    CSL_Edma3ChannelAttr*   pChAttr,
    CSL_Status*             pStatus

)

The structure CSL_Edma3ChannelAttr has two parameters: regionNum and chaNum.
What does mean the second parameter (chaNum) of this structure? Is this DMA channel?