C5515

Sorry, I could not understand your question completely. Do you mean that the IOs of DSP is driven by an external device? or, DSP is driving the external devices?

Obviously, if DSP is powered down, it cannot drive the IOs.

Also, the external device should have no effect on the on-power-DSP. (unless the extremely high voltage, it could damage the device)

Hope this will answer your questions.

Regards

Wen

Hi Wen

We've meant the case when an external driver will drive the MMC bus and all power supplies of DSP will be powered down.

The data sheet only descibes the case when the core power is down and IO power  is "ON". Therefore we've asked when all power supplies are down.

What do you mean "on-power-DSP"?

Could you clarify?

Michael

Hi Wen,

Please answer Michael question, from the 12/4,  your prompt reply is highly necessary.

Thanks,

Yaron

It is not recommended to apply a voltage on signal pins when the associated power to that I/O signal is not present.  This can cause excessive current draw and possible damage.

Thanks! Brandon.

Did this answer your question?

And sorry for the confusion, the on-power-DSP means a properly powered DSP in the system.

regards

Wen