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TMS320C5517: MCBSP Interface Compatibility I2S Uses DMA to Transfer Data Problems

Part Number: TMS320C5517

Dear TI:

The problems we are currently experiencing are:
I2S slave mode gets data from DRR to i2sDmaREFBuff. The simulation view has data. When the single step is executed, the data also changes. From here, I can think that the data in DRR is correctly obtained.
I2S main mode I need to transfer the data in i2sDmaREFBuff to DXR to send out, but I step through the view to see the DXR register value remains unchanged, the corresponding view DMA3 DMACH0 register value has not changed;

See the previous case for details.

e2e.ti.com/.../2596791

Please help analyze it!
Thanks!