Re: Thanks for the Verilog help

From: Jim Brain <>
Date: Sat, 14 Dec 2013 14:14:14 -0600
Message-ID: <>
On 12/14/2013 2:02 PM, wrote:
> On 2013-12-14, at 07:05, Jim Brain <> wrote:
>> This, coupled with a Saleae Logic logic analyzer makes for quick work of debugging.  I can probably ask Arkanix to run me a handful more of those Min-Xpander PCBs if there is interst.  They were $2.50 a piece, as I recall.  The CPLD board is this one:
> Datasheet says it “accepts 5V”, but “has 3.3V or 2.5V output capability”. The board doesn’t seem to provide any level conversion. How does this work in your setup?
Since 3V3 will support TTL levels (0 < .8V, H>2.0V, or maybe it's 
2.4V...) it seems to work fine.  EasyFlash3 uses the same IC, and no 
level shifters, and works fine (well, except for one revision of the 64 
mobo that drives RESET via a 555 without a current limiting resistor, 
meaning drivng reset from the expansion port requires a switch or 
something that can overpower the 555, but that's not a 3V3 IC's issue).


Jim Brain

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Received on 2013-12-14 21:01:05

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