is it ok to have a different frequency (other than 24MHz) at USB CLKIN pin at power up?

Hello, 

In our application, at power up, the clock device will provide around 80MHz clock to USB CLKIN pin instead of 24MHz. 

After power up, ADSP-SC587 will program the clock device to have 24MHz clock to provide to USB CLKIN pin. 

so, is it safe to provide a frequency other than 24MHz to USB CLKIN pin for a short duartion after power up?

Thanks and Regards

Tarang Jindal