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TMS320C5505: Confirm the Index Register on USB core

Guru 24520 points
Part Number: TMS320C5505

Hi TI Experts,

Please let me confirm the following question.
According to the User's guide, this device has the "indexed register" on USB core. It can be control the each endpoints by writing the Index Register. On the other hands, each endpoints the control and status register on CPU address. For example, Endpoint 1 is from 8511h to 851Eh and Endpoint 2 is from 8521h to 0852Eh.

So, if customer access the "PERI_TXCSR" regsiter on each endpoints, they could access with following two way.
1. Use the index register.
2. Direct access to each CPU address.
Is my understanding correct?

If yes, would you please teach me the benefit of "index register"?
My customer would like to know whether the above understading is correct and the reason why TI provide the index register.

If you have any questions, please let me know.
Best regards.
Kaka