Title: Built my CPLD breakout board
Post by: Segfault on May 12, 2011, 09:03:26 pm
Post by: Segfault on May 12, 2011, 09:03:26 pm
I was able to put my dev board together and it seems to work. I am attaching the pic of my build. I picked up a book on VHLD and hopefully I'll get rolling with this.
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Title: Re: Built my CPLD breakout board
Post by: ian on May 16, 2011, 07:53:09 am
Post by: ian on May 16, 2011, 07:53:09 am
Nice build, thanks for posting. Another Free PCB code is on the way :)
Title: Re: Built my CPLD breakout board
Post by: Segfault on May 16, 2011, 01:41:24 pm
Post by: Segfault on May 16, 2011, 01:41:24 pm
Thanks!
Title: Re: Built my CPLD breakout board
Post by: bearmos on May 16, 2011, 02:40:53 pm
Post by: bearmos on May 16, 2011, 02:40:53 pm
Congrats on the build, Segfault!
You might wan to take a look at U1's row close to C3 and make sure the pins are making full contact with the pads and have nice fillets (you can poke at them with a dental pick gently and see if they move, ideally they won't). It's a bit hard to see the fillets from the photo.
Note, this is merely a friendly suggestion:)!
You might wan to take a look at U1's row close to C3 and make sure the pins are making full contact with the pads and have nice fillets (you can poke at them with a dental pick gently and see if they move, ideally they won't). It's a bit hard to see the fillets from the photo.
Note, this is merely a friendly suggestion:)!
Title: Re: Built my CPLD breakout board
Post by: Segfault on May 17, 2011, 12:54:22 am
Post by: Segfault on May 17, 2011, 12:54:22 am
Thanks for the tip. I did as you suggested and found one pin that wasn't making good contact. I'll have to touch it up later. I did this without flux (never again) and remember having a solder bridge that I had to clean up there. I guess I took a little too much away.
Title: Re: Built my CPLD breakout board
Post by: bearmos on May 17, 2011, 12:54:49 pm
Post by: bearmos on May 17, 2011, 12:54:49 pm
Excellent, I'm glad that helped. I know if it were me, that one pin would have caused an intermittent issue, causing hours of frustration and troubleshooting :). I'd wind up combing through code and schematics for quite a while before finding it.
Also, there's a flux discussion over here (http://http://dangerousprototypes.com/forum/viewtopic.php?f=2&t=2302&p=21871&hilit=Things+that+disappoint+me#p21867)
Something I've found really helpful in controlling the amount of solder on the joints is a nice thin solder, .015" diameter or less; it's amazing how much easier it is to use. I found a small quantity at a local Radio Shack a while back, but you can also get it at any online store, like mouser (http://http://www.mouser.com/Tools-Supplies/Solder-Fluxes-Accessories/_/N-wp6hZscv7?P=1z0jnibZ1z0jntf&Keyword=solder&FS=True)
Also, there's a flux discussion over here (http://http://dangerousprototypes.com/forum/viewtopic.php?f=2&t=2302&p=21871&hilit=Things+that+disappoint+me#p21867)
Something I've found really helpful in controlling the amount of solder on the joints is a nice thin solder, .015" diameter or less; it's amazing how much easier it is to use. I found a small quantity at a local Radio Shack a while back, but you can also get it at any online store, like mouser (http://http://www.mouser.com/Tools-Supplies/Solder-Fluxes-Accessories/_/N-wp6hZscv7?P=1z0jnibZ1z0jntf&Keyword=solder&FS=True)