If you have an application which uses a large look-up table and you are running out of space to put it in,try converting the table to its equivelent logic so you replace the ram block with some logic in the code,I use espresso to convert the LUT to logic function which is implemented as a sum_of products function.
You have to remember to turn off the compilers optimisation routines for that block when you compile the code.
there you go Jezwolds tip number 532661 of a series of ...erm loads.