Honored Contributor
Honored ContributorI contacted sevral companys but there is only one company (in my contry) who could solder BGA and test with x-Ray, but they are asking 400-700euros (for Quantities 1-100 and in local forum gays sayed that in mobile phone repair servic they solder these BGA packages for mobile phones so maby they will solder few FPGAs for 20$ http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/smile.gif if not then there is alternative it is (Home) electrical owen were could be solderes SMD parts. There are few links were is described how to do this soldering in home http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/smile.gif and after soldering I will make testing.
Is there some cheap companys that can make PCB and asemble it ?? i found good desciption about FPGA ground design in xilinx page and they have example of how to chose capacitors and they Quantity and I recalculated for my ep2c20f256 and here are results i got : For VCC INT 1.2V (VCC int has 9 pins and VCC IO 20 pins = 29 VCC pins) 680uF Q=1 2.2uF Q=4 0805 0.47uF Q=8 0603 0.047 Q=16 0402 totaly there is 29 caps for each voltage level so I will doble number off all caps for 2 voltage levels and will have 58 caps. Once again I am thinking that it would be mutch esear to buy this cheap FPGA bor for 175$ but in future If I will develop some good application I will have to designe this PCB anyway, and will have to buy expensive Lattice Fpga 72$ is olmost twice as mutch comared to ep2cC20 42$ I will redesigne my PCB http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/mad.gif becose there is too litle place for cap vias and only way is use 6 layers insted of 4.
