If you are a JUCO transfer that was a nonqualifier coming out of HS, you will need your AA degree to play D-I ball. If you transfer wihout the AA, you will have to sit one year after.
If you were a qualifyer (double check this) I believe you need to pass 12 credits for each semester of attendance to be an eligible D-I transfer.
The catch is, if you are a JUCO transfer that has taken the mimimum (12 credits) and decides to transfer after your 4th semester, you now have to worry about % of degree and how many of your JUCO credits are transferable to that D-I instituiton. Depending on your number of transferable credits, if it is too low by NCAA standards for % of degree, you could be ineligible.
I don't know the rules for D-II or III.
If transfering to a D-III to a D-I institution, you need a release (in some cases, even if you didn't play) and you need to be in good academic standing (eligible to play) at the D-III institution to be eligible at the D-I institution.