This part is a kind of semiconductor called XCF04S.

Function of this product has (XCFxxS) Platform Flash In-System Programmable Configuration PROMs.

Manufacturers : Xilinx

Image and pinout :

Some of the text within the PDF file :

0 R Platform Flash In-System Programmable Configuration PROMs 0 DS123 (v2.1) November 18, 2003 0 Preliminary Product Specification Features • • • • • • • • • In-System Programmable PROMs for Configuration of Xilinx FPGAs Low-Power Advanced CMOS FLASH Process Endurance of 20,000 Program/Erase Cycles Operation over Full Industrial Temperature Range (–40°C to +85°C) Available in small footprint packages: VO20, VO48, and FS48 IEEE Standard 1149.1/1532 Boundary-Scan (JTAG) Support for Programming, Prototyping, and Testing JTAG Command Initiation of Standard FPGA Configuration Cascadable for Storing Longer or Multiple Bitstreams Dedicated Boundary-Scan (JTAG) I/O Power Supply (VCCJ) • • • I/O Pins Compatible with Voltage Levels Ranging From 1.5V to 3.3V Design S [ ... ]

XCF04S PDF Datasheet Download