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PostPosted: Fri Mar 16, 2018 6:34 pm 
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lidnariq wrote:
I'm a little confused by their claim that the '824 there supports 17 I/O—unlike some of the older ones, I don't see a way to turn off the I²C logic unit, so that's two pins permanently lost.


From the datasheet, "The SLG46824 has a total of 13 GPIO, 2 GPO and 2 GPI Pins which can function as either a user defined Input or Output, as well as serving as a special function (such as outputting the voltage reference). ... GPI: SCL and SDA serve as General Purpose Input Pins."

Looks like they're general purpose IN only, and including them in the i/o count because of that.

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PostPosted: Fri Mar 16, 2018 6:55 pm 
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Yeah, but even allowing them to be exclusively inputs, I didn't see a way to disable I²C so that the general fusemap could use them in logic, nor did I see SCL and SDA show up in the matrix (pages 30-31) for use.

Too bad they only mention the '824 and '826 as coming in packages with legs.


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PostPosted: Fri Mar 16, 2018 7:00 pm 
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Ahh I see, possible them being as new as they are the tools aren't fully updated with the silicon's abilities. Sounds like may be worth asking support directly.

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PostPosted: Sat Mar 17, 2018 6:26 am 
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I see, so it would require quite the redesign involving at least a greenpak and it'd need to be price-comparable to the currently used off the shelf logic devices; which would narrow the range of possibilities further.

I think the most useful division would be the 2 ppu page selects from the cpu page select since they're quite central. separating the 2 ppu page selects from each other or the blinkenlights from the rest seems like "only if there's logic left to use" options.

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PostPosted: Sat Mar 17, 2018 1:03 pm 
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Eh, just a GreenPak with enough I/O.

Because I enjoy greenpak golf, I was able to stuff something like GTROM into one SLG46537, with the following function map:
Code:
mask: $F000
 $5000: [.... DDDD] - selects 32K PRG bank
 $6000: [.... ...C] - selects 8K CHR RAM bank
 $7000: [.... ...N] - selects 4K NT RAM bank


Attachments:
gtrom-separated.png
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