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Re: Gryphon 68030 [message #798 is a reply to message #796] Sun, 12 June 2016 17:55 Go to previous messageGo to previous message
yoda is currently offline  yoda
Messages: 125
Registered: October 2015
Location: Cedar Rapids, IA
Senior Member
lynchaj wrote on Sun, 12 June 2016 19:40
Hi
When reviewing the PCB layout please pay special attention to the footprints especially the SMT components. There are three SMT components we are probably stuck with as there aren't any reasonable alternatives: ethernet, video, and video DRAM chips.

In particular the video chip is tiny. It is a 14mmx14mm QFP with 0.4mm pin spacing as best I can tell from the datasheet. Don't drink any coffee before soldering that one in!

The net effect of this is the board requires 0.006" trace width and 0.006 trace clearance to even attempt to route video chip. That is true angel hair fine tracing and it might be an issue with the board.

Andrew Lynch


Hi Andrew

The Video chip was not directly on the board. It was down as a breakout board that plugs in. You can go to Proto Advantage and they will solder to their adapter for 20 dollars as I recall and you can have them get the part from Digikey. I would highly recommend that way if you have any concerns on SMT soldering. The ethernet and dram was not too bad to had solder but the video is scary.
 
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