Part Number : SM3257EN
Function :High Speed USB2.0 Flash Memory Controller / Available in LQFP/TQFP 64/48pin and QFN 40pin
Manufacturer : Unspecified
Pinout : 
Description
The SM3257EN is a feature-enhanced USB2.0 Flash Disk controller with high compatibility and best
performance designed to support MLC and TLC NAND flash. The controller also supports high speed
ONFI 2.x and Toggle mode NAND. Compliant with USB version2.0 specification and USB Mass Storage Class version 1.0 specification, the SM3257EN provides write protect, PC boot-up from USB2.0 Flash
Disk, password protection, secured partitioning functions, etc.
Reference Site : http://flash-extractor.com/forum/viewtopic.php?t=5616
Datasheet PDF Download
Other datasheets in the file : SM3257EN