This part is a kind of semiconductor called GD25Q20.

Function of this product has Dual and Quad SPI Flash.

Manufacturers : GigaDevice

Image and pinout :

Some of the text within the PDF file :

Uniform Sector Dual and Quad SPI Flash GD25Q40/20/10/512 FEATURES ◆ 4M/2M/1M/512K-bit Serial Flash -512/256/128/64K-byte -256 bytes per programmable page ◆ Standard, Dual, Quad SPI -Standard SPI: SCLK, CS#, SI, SO, WP#, HOLD# -Dual SPI:SCLK, CS#, IO0, IO1, WP#, HOLD# -Quad SPI:SCLK, CS#, IO0, IO1, IO2, IO3 ◆ High Speed Clock Frequency -120MHz for fast read with 30PF load -Dual I/O Data transfer up to 240Mbits/s -Quad I/O Data transfer up to 480Mbits/s ◆ Program/Erase Speed -Page Program time:0.7ms typical -Sector Erase time:150ms typical -Block Erase time:0.3.5s typical -Chip Erase time:321.5s typical ◆ Flexible Architecture -Sector of 4K-byte -Block of 32/64K-byte ◆ Low Power Consumption -20mA maximum active current -5uA maximum power down current ◆ Software/Hardware W [ ... ]

GD25Q20 PDF Datasheet Download