Device problem(EP4CGX150DF27I7)

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hi:

I have buy some fpga devices , EP4CGX150DF27I7,the silkscreen of device surface as the following imae. I can`t understand the silkcreen represent what mean? or the devices are bad?

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That is a larger member of the cyclone 4 family of devices. As long as the parts are real, and not fake, they are good parts:

http://www.buyaltera.com/scripts/partsearch.dll?detail&name=ep4cgx150df27i7-nd

https://www.altera.com/content/dam/altera-www/global/en_us/pdfs/literature/hb/cyclone-iv/cyiv-51001.pdf

Pete