It carries 1161216 total RAM bits on-chip.
Logic density and memory — what 39600 LEs and 1.1 Mbit RAM mean on the board
The 2475 LABs/CLBs give the fitter room to route complex combinatorial paths without excessive LUT packing. 1161216 RAM bits handle typical block-RAM needs.
I/O and package — 328 pins in a 23x23 mm BGA
328 user I/O in a 484-BGA (23x23 mm body) gives you enough pins for a memory bus, a parallel LCD interface, and several serial links without multiplexing.
This part is intended for indoor, temperature-controlled equipment.