it's debug code on an FPGA chip
Self-promotional jingoistic hype - the discovery of debug code is not an intentional back door, nor was it placed by the chinese...
http://erratasec.blogspot.ca/2012/05/bogus-story-no-chinese-backdoor-in.html
While they did find a backdoor in a popular FPGA chip, there is no evidence the Chinese put it there, or even that it was intentionally malicious.