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nRF24LU1P operation without USB connection?

I'm trying to use the nRF24LU1P as a standalone 8051 with the nRF24 radio inside. I provide 5v on the USB connection but no host connection. I am trying to operate in PRX mode and just respond to packets over the air.

My code works if I open a connection from the USB side at least once. I can close that connection and it still works. However, if I have not at least opened it once then it does not respond, and the debug LED blinks tell me that it's not even executing that part of my code. This tells me that there's something that gets plumbed in the code to properly turn on the radio when the USB is connection is established. I am assuming it's something that happens as a result of an interupt.

If anyone is familiar with the things one has to do in order to get the chip to operate with the radio with no USB connection I'd love to know it.

MORE IMPORTANTLY: if you know this mode cannot possibly work please speak up - I can save some time and owe you a favor back.

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