GLS27SF020 for snes cart??

[brunog]

Hey everyone,

I was looking on mouser.com and found GLS27SF020-70-3C-PHE and GLS27SF010-70-3C-PHE. Can someone please tell me if these will work in an snes cart? Unfortunately I don't know very much about eprom flashing but I will be getting a Willem Programmer in the mail in a few days so I can start playing around.

Can someone tell me if that flash will even work on a Willem? If not, can someone please recommend a flash that will work for snes carts and Willem Programmers. Most of the eproms people have been recommending aren't in production any more.

Thanks in advance for any sort of info.

[lidnariq]

The GLS27SF020 and '010 could work, but they are only 256 KiB and 128 KiB in size, respectively; this should be fine if you're making a test cart or want to flash some homebrew, but is probably too small for less legal purposes.

[brunog]

It says 128kbit x8 and 256kbit x 8 so 1mb and 2mb. They should be fine for repro/ homebrew carts for my personal use right? Just wanted to know if they are the right type of chip and if Willem programmer could flash them.

I thought they might work well because they come in a pdip32 and are 5v so no voltage translation?

[lidnariq]

Yeah, they'll work fine. Might need a tiny bit of rewiring on any PCB that started with a 32-pin ROM, but that's it.

As to whether the Willem supports them? Best to look in the Willem documentation. (If it doesn't, the SST39SF010A/020A/040 should be fine instead)

There's several 32KiB and 64KiB free-or-open-source images, but everything licensed is 256KiB or larger.

[brunog]

Thanks, I'll order some tomorrow and see what happens.

[TmEE]

1 and 2MBit chips are kinda small for anything beyond homebrew, you'd need quite the multitude for commercial games. 4 or 8 for 1MByte sized games.

[brunog]

Sorry I guess I had my Mb and MB confused... I thought Mb was megabit and MB was megabyte. The page on mouser says MB up top in the description and Mbit in the specs on the page. I guess I need to find something different.

[tepples]

Making lemonade of this lemon:
2 Mbit would be good for making and testing an entry into a hypothetical 2 Mbit game competition.

[lidnariq]

The largest currently-manufactured DIP 'PROMs are 4 Mibit/512 KiB.

The largest currently-manufactured 5V 'PROMs are TSOPs 16 Mibit/2 MiB.

You can get new-old-stock and/or part pulls of larger 5V 'PROMs, such as the 27C322.

[brunog]

im having trouble finding a new 3.3v eprom/flash that are large enough. any suggestions?

would a voltage level translators using a BSS138 like they talk about here work?
http://electronics.stackexchange.com/qu ... el-shifter

the board for the flash might end up being as large as the cart if you have to have to have a voltage translator for almost every lead on the flash but as long as it works right?

[lidnariq]

im having trouble finding a new 3.3v eprom/flash that are large enough. any suggestions?

Oh, in DIP? Yeah, doesn't exist.

SMD, you shouldn't be having any difficulty. (e.g.) Macronix makes 3V things up to 128MiB.

would a voltage level translators using a BSS138 like they talk about here work?

It's probably cheaper to use something like the GTL2000 or the sn74tvc16222, which is basically an array of a bunch of the aforementioned circuit all in a single package.

[qwertymodo]

Micron makes 3V TSOP's up to 1Gbit. I think 2Gbit is the first size that comes in BGA-only, but maybe that one comes in TSOP as well, I don't remember...

[brunog]

With a little help i found ones that might work like S29AL016J70TFI020. Now its just down to doing some research and figuring out how to make it all work. This is probably going to beyond me but the whole point is to try and learn something right?

Things i need to figure out-

-How and if i can flash that chip with my willem programmer(when it gets here) without buying an adapter that costs an arm. (use tsop breakout board to build something simple???)
-how to adapt the tsop48 to work with dip32/dip36. i guess i can look at the tsop40 to dip36 adapter on buyicnow.com and try and see what the hell they did with all those extra legs.
-voltage translation, using GTL2000 looks simple enough.

[lidnariq]

If you're only aiming for a 16Mibit=2MiB cart, and you're already ok with using a TSOP, you might start with Micron's 5V M29F160F so that you can separate the complexity of a voltage-shifting design from soldering TSOP.

[brunog]

That's an obsolete part though from what I saw. I was hoping to do this with parts that are current.

You know how this sort of thing goes. Started off trying to find a way that was cheaper and it turned into something totally different that's going to cost me double.

Easyiest way would be to buy a presoldered thingamajig on an adapter from buyicnow I guess but that's boring now.