除了使用度娘,google,感觉goolge好点;
还有一下
altera.com
http://forums.xilinx.com
http://opencores.org/project,i2c_master_slave
http://www.eewiki.net/display/LOGIC/I2C+Master+(VHDL)
http://www.fpga4fun.com/I2C.html
不要忘记http://www.terasic.com/english/discuss.htm