This part is a kind of semiconductor called EPCQ256.

Function of this product has Quad-Serial Configuration (EPCQ) Devices.

Manufacturers : Altera Corporation

Image and pinout :

Some of the text within the PDF file :

Quad-Serial Configuration (EPCQ) Devices Datasheet CF52012-3.0 Datasheet This datasheet describes quad-serial configuration (EPCQ) devices. Supported Devices Table 1 lists the supported Altera EPCQ devices. Table 1. Altera EPCQ Devices Device EPCQ16 EPCQ32 EPCQ64 EPCQ128 EPCQ256 Memory Size (bits) 16,777,216 33,554,432 67,108,864 134,217,728 268,435,456 On-Chip Decompression Support No No No No No ISP Support Yes Yes Yes Yes Yes Cascading Support No No No No No Reprogrammable Yes Yes Yes Yes Yes Recommended Operating Voltage (V) 3.3 3.3 3.3 3.3 3.3 Features EPCQ devices offer the following features: ■ Serial or quad-serial FPGA configuration in devices that support active serial (AS) x1 or AS x4 configuration schemes Low cost, low pin count, and non-volatile memory 2.7-V to 3.6-V [ ... ]

EPCQ256 PDF Datasheet Download