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Discussing the Open Source FPGA Amiga Project
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 Post subject: Re: SPI mod
PostPosted: Fri Mar 16, 2012 5:44 pm 
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Joined: Thu Sep 24, 2009 8:07 am
Posts: 36
Yeehaw! :D Speeds now good. Chipset showing exact same numbers as on your screenshot bbond007. Drive reading on DH0: @ 1.999 MB/s something. I guess I could use some higher class SD card to improve that as well.

Thanks guys, my Minimig rocks even harder now.

[OFF TOPIC --- Now I should cram my Miggy with WHDLoad titles. I have a lot of original floppy games here, and tried to install from-internet-ADFs of them, but it looks like I'm going to have to create images of my own disks because what you get on the net are ADFs of cracked games, and WHDLoad doesn't handle that very good. It doesn't handle them at all, in fact: as to yet, all installs (10) I've tried have failed! :cry: ]


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 Post subject: Re: SPI mod
PostPosted: Sat Oct 17, 2015 12:45 am 
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Joined: Sun Feb 22, 2009 5:02 am
Posts: 175
I suppose this is as bridged as it can get? I have SPI enabled, but "only" get close to 1.7MB/sec with latest firmware and minimig core.


Attachments:
IMG_7824.jpg
IMG_7824.jpg [ 103.33 KiB | Viewed 1230 times ]

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 Post subject: Re: SPI mod
PostPosted: Sun Oct 18, 2015 11:14 am 
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Joined: Mon Dec 01, 2008 9:58 pm
Posts: 1568
Location: .de
I also made this kind of modification to my first Minimig board... because I did understood the mod-info wrong ;)
Its working but its not "the nice way".

Your data transfer rate is quite OK. Its speed depend on some variables like
- sd-card type (mmc are slower in general)
- FAT formatted block size
- fragmentation of the HDF at the FAT-site.

If you disable the SPI Mod (holding down MENU button while power-up or PGM_RESET), the data transfer rate should drop a lot.
As long as there is no problem in reading/writing sd-card data, this Mod can stay as it is.

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 Post subject: Re: SPI mod
PostPosted: Wed Oct 21, 2015 11:34 pm 
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Joined: Sun Feb 22, 2009 5:02 am
Posts: 175
It is still very unclear for me what constitutes "the right way" :)

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 Post subject: Re: SPI mod
PostPosted: Fri Oct 23, 2015 11:35 am 
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Joined: Tue Nov 09, 2010 3:10 pm
Posts: 316
Shouldn't the bridge be *across* R51 & R50, thereby connecting them (near the RAM chip)?

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 Post subject: Re: SPI mod
PostPosted: Sun Oct 25, 2015 11:17 am 
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Joined: Mon Dec 01, 2008 9:58 pm
Posts: 1568
Location: .de
Yes the correct fix should bypass the R51 resistor.
In this case both resistor are not present and the signal just "storm" the sd-card. It also works but as mentioned, it is not the proper (nice/right) way to do this fix.

When it is working without data transfer error (i.e. booting BetterWB HDF at CPU Turbo mode), it can stay this way.

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 Post subject: Re: SPI mod
PostPosted: Wed Oct 28, 2015 6:22 am 
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Joined: Thu Sep 24, 2009 8:07 am
Posts: 36
Fixed the image links to the shots of my mod on the previous page. If anyone needs to take a peek.


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