Re: FPGA/CPLD different approach

From: silverdr_at_wfmh.org.pl
Date: Wed, 4 Sep 2013 17:46:26 +0200
Message-Id: <87AB3D6F-0C68-4791-8465-9C07995CDC06@wfmh.org.pl>
Of course the most valuable would be the version, which remains within the original footprint (swinsid, realpla). But given the state of affairs I doubt anyone will be heavily sniffing at one exceeding it a bit.
-- 
Sent from mobile phone (so please have understanding).

On 3 wrz 2013, at 15:15, Bil Herd <bherd@mercury-cg.com> wrote:

> I did a quick fitting on some opencores and found that the PIO’s and support chips probably fir in the CPLD’s and that the processors probably didn’t.
>  
> I have a question for anyone that is interested in using FPGA/CPLD emulated parts: How important is it that the PCB of a drop in replacement stay strictly in the foot print of a 40/48 pin chip or is the PCB okay to be wider than .6” once its .3-.4” above the socket it’s inserted into?
>  
> Bil
>  
> From: owner-cbm-hackers@musoftware.de [mailto:owner-cbm-hackers@musoftware.de] On Behalf Of Ed Spittles
> Sent: Tuesday, August 27, 2013 4:13 PM
> To: cbm-hackers@musoftware.de
> Subject: Re: FPGA/CPLD different approach
>  
> For some purposes OHO's GOP board might be a better fit than the GODIL - it's smaller, got fewer pins, but has a 512kByte SRAM on board..
> http://www.trenz-electronic.de/products/fpga-boards/oho-elektronik.html
> http://shop.trenz-electronic.de/catalog/default.php?cPath=1_48_137
>  
> (For simple designs there are CPLD variations, but as noted that's not big enough for a 6502-like CPU, or for ROM or RAM.)
>  
> As noted elsewhere, these boards have 5V level converters, crystals, and on-board EEPROM for configuration.
>  
> Cheers
> Ed
>  
>  
> 
> On 27 August 2013 11:34, Ingo Korb <ml@akana.de> wrote:
> Bil Herd <bherd@mercury-cg.com> writes:
> 
> > I have gone through some test fitting but haven't really checked out
> > GODIL, for instance can they program the VCC and Ground pins or do
> > they have to physically configure?
> 
> They can be freely configured using jumpers, but as Didier noted the
> pinning of those headers is a bit weird. IIRC the DIL pin alternates
> between the left and right side of the header and the other pin
> alternates between 5V and GND for each row, so you can select GND and 5V
> for any DIL pin by setting the jumper either horizontally or
> vertically.
> 
> > I suspect that to keep the cost
> > down that the PCB might be wider than the .6" DIP but didn’t yet
> > research if that’s a show stopper.
> 
> It's much wider and longer - the board is 33.5 mm x 74.3 mm, the DIL
> interface at the bottom appears to be centered. The overall height
> including the DIL pins is ~20 mm.
> 
> -ik
> 
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>  


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Received on 2013-09-04 16:00:05

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