Neither do I. But you should know what flash memory means =)
It's like a USB keystick, only it's not a USB keystick =) It's just the raw stuff that they're made out of, in a chip format. You trigger the I/O ines and you can read and write to it. It's 2mbit, which means 2 million bits, or about 250kilobytes of data. It is of no use to you without a micro controller or processor to access it.
All the rest of the information in that PDF is on the timings of the I/O pin toggling required to access it so you know how to trigger it and what to expect as an output when you do.