This part is a kind of semiconductor called GD25Q20B.

Function of this product has Uniform sector 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 GD25Q40B/20B GD25Q40B/20B DATASHEET 1 Uniform Sector Dual and Quad Serial Flash Contents GD25Q40B/20B 1. FEATURES .4 2. GENERAL DESCRIPTION 5 3. MEMORY ORGANIZATION...7 4. DEVICE OPERATION 9 5. DATA PROTECTIO [ ... ]

GD25Q20B PDF Datasheet Download