See
http://www.samsung.com/global/busine...ry_WEB_new.pdf to decode the ID (2555D5EC in your case) -- it reads backwards, so read as EC D5 55 (ignore the first two digits). Also see datasheet for additional information.
Result: your chip is Samsung (EC), 16Gb x 8, 3.3v. 2048+16 bytes, 256K page size.