Usb Clock with IMO

[psoc_student]

Hello, I am making a custom board using CY8C6136.

While looking at the TRM documentation, you should use Clock with a 0.25% error rate in USB Device mode and there was also a way to use IMO below.

If so, does it mean that the error rate is about 0.25% when using USB using IMO?

I wonder what the error rate is when operating USB using IMO. Also, if the error rate is very high, I would like to know how to adjust it.

Thankyou for your apply

[Len_CONSULTRON · Accepted solution]

psoc_student,

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... If so, does it mean that the error rate is about 0.25% when using USB using IMO?

...

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Yes.  If you configure the IMO as the internal source clock AND configure the internal USB, the IMO clock will lock onto the USB clock from the host USB and in effect keep the IMO clock to +/- 0.25 % accuracy.

[psoc_student]

Hello @Len_CONSULTRON 

Then, is it okay to operate the USB device mode only with IMO + PLL?

[Len_CONSULTRON]

I don't see why you couldn't.