Hang in there Josh, I had this with one of mine. Turned out to be "solder balls" that formed from the solder paste I was using under the CPLD. I couldn't see them till I pulled the chip. I'd recommend visually inspecting everything with high magnification - use your phone or digital camera if nothing else - and then test each neighboring pin with a meter for bridges. If that's all clear test the programming headers back to the appropriate CPLD pins for continuity.
As a good friend always reminds me - "success lies on the far side of failure" so fail quickly and fail often if you want to get ahead. Brian On Sun, Oct 22, 2017 at 5:01 PM, Josh Malone <josh.mal...@gmail.com> wrote: > Built my first functional REX on the castellated PCB. Programs and tests > okay. > > But, I've also built me second non-functional REX, too. So far I'm > 3-out-of-5 for successful builds. Not sure I'm really up to this. :( > > Maybe I can figure out what's wrong w/ this board. Impact says it > finds lots of unknown devices on the chain and barfs. Reflowed the > CPLD pins but it didn't help. Bugger. > > At least I have one functional REX for my 102, so, yay! > > -Josh > > On Fri, Oct 20, 2017 at 10:05 PM, Brian White <bw.al...@gmail.com> wrote: > > That would be awesome of course! > > > > On Oct 20, 2017 12:35 PM, "Stephen Adolph" <twospru...@gmail.com> wrote: > >> > >> good to hear the castellated board is working. > >> I revised the REX PCB design to (1) remove unneeded parts (2) use ground > >> and power planes and (3) provide a pad to bridge 3.3V onto PORT_EN with > a > >> solder bridge. I don't myself plan to test the board but I can post it > for > >> others to test. > >> Steve > >> > >> On Fri, Oct 20, 2017 at 12:23 PM, Josh Malone <josh.mal...@gmail.com> > >> wrote: > >>> > >>> My parts should arrive tomorrow. How to take a stab at try two soon. > >>> thanks to everyone for all the help. > >>> > >>> On Oct 20, 2017 11:38 AM, "Brian Brindle" <bbrin...@gmail.com> wrote: > >>>> > >>>> Reflow of the board seemed to fix it. Guess I need to play around with > >>>> my methods a little. Working as expected right now. > >>>> > >>>> On Oct 20, 2017 8:31 AM, "Brian White" <bw.al...@gmail.com> wrote: > >>>>> > >>>>> Yeah that looks good. > >>>>> > >>>>> On Oct 20, 2017 6:32 AM, "Brian Brindle" <bbrin...@gmail.com> wrote: > >>>>>> > >>>>>> I'm using some AM29F800BB-90EF I had. Waiting on the AM29F800BB-7EK > >>>>>> from China still. Should be here today. > >>>>>> > >>>>>> > >>>>>> On Oct 19, 2017 8:47 PM, "Brian White" <bw.al...@gmail.com> wrote: > >>>>>>> > >>>>>>> What exact flash part number do you have? > >>>>>>> > >>>>>>> > >>>>>>> On Thu, Oct 19, 2017 at 1:22 PM, Brian Brindle <bbrin...@gmail.com > > > >>>>>>> wrote: > >>>>>>>> > >>>>>>>> I have one put together that programmed up OK but am having issues > >>>>>>>> getting the REX software on it. It erases all the blocks just > fine but hangs > >>>>>>>> when re-loading to block 0. Probably something up with the flash.. > >>>>>>>> > >>>>>>>> I'll report back when I have more info. > >>>>>>>> > >>>>>>>> Brian > >>>>>>>> > >>>>>>>> > >>>>>>>> On Thu, Oct 19, 2017 at 7:25 AM, Stephen Adolph > >>>>>>>> <twospru...@gmail.com> wrote: > >>>>>>>>> > >>>>>>>>> Has anyone made a REX successfully with that modified PCB yet? > >>>>>>>>> I would like to know if that artwork is good or bad. > >>>>>>>>> > >>>>>>>>> ..Steve > >>>>>>>> > >>>>>>>> > >>>>>>> > >> > > >
