My advisor and I have decided to present some resent research results in a well-known conference, selected based on our discussions. Now the aforementioned joint paper has been accepted and the clock's ticking to consider the payment of the registration. We have never talked about the financial aspect of this process. The cost associated with registration and transportation is quite high, but my advisor has not yet told me anything about any plan to take that into account and there are just a couple of days left until the payment deadline. I am wondering if he assumes that I myself must pay the fee, but I cannot afford the whole cost . If he expects me to pay all of that registration fee, I have to get over finalizing the registration and the conference, at all. In my perspective, the 50-50 code of ethics sounds fair enough.
Is it ethical to talk about such a thing with the advisor?
If so, how would I supposed to explain and handle the case?