This part is a kind of semiconductor called GD25Q16B.

Function of this product has Dual and Quad Serial Flash.

Manufacturers : GigaDevice

Image and pinout :

Some of the text within the PDF file :

Uniform Sector Dual and Quad Serial Flash GD25Q16B GD25Q16B DATASHEET 1 Uniform Sector Dual and Quad Serial Flash Contents GD25Q16B 1. FEATURES .4 2. GENERAL DESCRIPTION 5 3. MEMORY ORGANIZATION...7 4. DEVICE OPERATION 8 5. DATA PROTECTION... [ ... ]

GD25Q16B PDF Datasheet Download