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 Post subject: Re: CPS2 digital AV interface
PostPosted: Mon Feb 12, 2018 12:31 am 



Joined: 05 Aug 2017
Posts: 7
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I have a question regarding how to hand-solder the ground (41) underneath the FPGA. I placed solder in the hole exposed underneath the board, but I've a feeling this isn't how you are supposed to do it (see picture above).

I've a feeling this board isn't going to work due to my soldering skills, but it has been an education nonetheless.


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 Post subject: Re: CPS2 digital AV interface
PostPosted: Mon Feb 12, 2018 6:31 pm 


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Joined: 25 Dec 2013
Posts: 473
Location: Indiana
You should be able to get solder to flow down that large hole.

I'm not sure what tools you have, but I normally put solder paste on. Set the chip down and tack a few legs. And then use hot air or iron on the bottom side.


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 Post subject: Re: CPS2 digital AV interface
PostPosted: Sun Feb 18, 2018 9:10 am 


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Joined: 15 Dec 2012
Posts: 512
Location: Finland
mikejmoffitt wrote:
The main issue is for HDMI audio you have digital audio as well as analogue audio coming from the YM2610. It would maybe be easier to just reimplement the SSG portion of that chip in HDL and tap the bus, to avoid having to do ADC.
From a quick glance that'd require tapping quite many pins. A separate Neo-Geo specific daughterboard which would combine and encode audio into I2S could do the job until/unless someone forks/creates a dedicated Neo-Geo digital AV mod.


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 Post subject: Re: CPS2 digital AV interface
PostPosted: Sun Feb 18, 2018 9:14 am 


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Joined: 15 Dec 2012
Posts: 512
Location: Finland
xterc wrote:
I have a question regarding how to hand-solder the ground (41) underneath the FPGA. I placed solder in the hole exposed underneath the board, but I've a feeling this isn't how you are supposed to do it (see picture above).

I've a feeling this board isn't going to work due to my soldering skills, but it has been an education nonetheless.
Getting a good connection on the bottom pad is hard as its underneath area is part of a big ground plane, but it's crucial as without it the FPGA doesn't work reliably or at all.


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 Post subject: Re: CPS2 digital AV interface
PostPosted: Wed Mar 07, 2018 4:48 am 


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Joined: 19 Oct 2013
Posts: 254
Any update on the revised board?


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 Post subject: Re: CPS2 digital AV interface
PostPosted: Sat Mar 10, 2018 3:13 pm 


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Joined: 15 Dec 2012
Posts: 512
Location: Finland
cr4zymanz0r wrote:
Any update on the revised board?
Schematic was finished a few weeks ago, now I just have to complete the layout. There's also been a different ideas to help installation, one suggested by DewmanSNK on the previous page and one with a helper PCB around M5M RAM chips.


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 Post subject: Re: CPS2 digital AV interface
PostPosted: Wed Apr 04, 2018 9:51 pm 


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Joined: 15 Dec 2012
Posts: 512
Location: Finland
The PCB design is almost finished now. I took a couple mockup pictures to demonstrate the planned mounting method. It involves soldering a pair of HLE-105-02-G-DV-PE passthru sockets on top of M5M chips, and a pair of HLE-105-02-G-DV-PE-LCs on matching position on top of scanconverter PCB (which has cutouts for bottom sockets).That should provide easily detachable yet reliable installation method for the mod.


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 Post subject: Re: CPS2 digital AV interface
PostPosted: Thu Apr 05, 2018 8:17 am 


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Joined: 19 Oct 2013
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