[Coco] Stable colours

Tue Sep 30 14:18:16 EDT 2014

Maybe a sinlge port SRAM might work. I need to build a latch in vhdl. It
reads at 25Mhz and writes once each 8 cycles at 114Mhz. The write could be
delayed, while the genlock is digitizing the next pixel, it takes 8 cycles.

I do have a SRAM at home. Maybe I can try it.

Luis Felipe Antoniosi

On Tue, Sep 30, 2014 at 2:14 PM, Luis Antoniosi (CoCoDemus) <
retrocanada76 at gmail.com> wrote:

> or these one:
>
>
> http://www.ebay.ca/itm/ALTERA-FPGA-Cyclone-II-EP2C5T144-Minimum-System-Development-Board-/301303366478?pt=LH_DefaultDomain_0&hash=item462714834e
>
> more suitable with a 50Mhz clock. Same as altera de0-nano.
>
>
>
> Luis Felipe Antoniosi
>
>
>
> On Tue, Sep 30, 2014 at 2:09 PM, Luis Antoniosi (CoCoDemus) <
> retrocanada76 at gmail.com> wrote:
>
>> I don't need RAM if a external SRAM is used but it would require to be
>> dual port since the read/write are in distinct clocks.
>>
>> Also, I need a PLL that locks at exactly 114.5454 witch is NTSC 3.579545
>> x 32. Yes I need to digitize evey pixel 8 times.
>>
>> Does this CPLD have LVDS ports ? I need 3 of them.
>>
>> Doesn't worth buynig those instead ?
>>
>>
>> http://www.ebay.ca/itm/ALTERA-Cyclone-FPGA-Development-Board-JTAG-AS-SPI-Flash-EP1C3-Quartus-II-CPLD-/230960685109?pt=LH_DefaultDomain_0&hash=item35c6546035
>>
>> It has a 30Mhz clock, not certain at this. I could check on Quartus.
>>
>>
>> Luis Felipe Antoniosi
>>
>>
>>
>> On Tue, Sep 30, 2014 at 1:48 PM, Mark Marlette <mmarlette at frontiernet.net
>> > wrote:
>>
>>> Luis,
>>>
>>> BGA type components require xray to verify quality. Others will say it
>>> is not required but IMHO, it is the only way to verify placement and joint
>>> quality.
>>>
>>> So that really rules out most home assembly lines.
>>>
>>> A quick look the EPM570 fits on the LEs but the 16KRAM will be a problem
>>> in the Altera line as I know it. Depending how this is used, external SRAM
>>> could replace it along with the SDRAM.
>>>
>>> 5.4nS device EPM570 w3.3v core is ~$13.33 at Digikey in a 100 pin TQFP
>>> package, which is easily to solder at home with the proper tooling. Go to
>>> the 144pin TQFP price jumps to $18.10
>>>
>>>
>>> Depending on pin counts, price will vary.
>>>
>>>
>>> Mark Marlette
>>> http://www.cloud9tech.com
>>> mark at cloud9tech.com
>>>
>>>
>>> ________________________________
>>>  From: Luis Antoniosi (CoCoDemus) <retrocanada76 at gmail.com>
>>> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
>>> Sent: Tuesday, September 30, 2014 8:55 AM
>>> Subject: Re: [Coco] Stable colours
>>>
>>>
>>> Well if you go for a DE0-Nano it costs 80 dollars. The daugher board is
>>> pretty simple, 10 dollars and the components pretty available: bunch of
>>> resistors, a variable resistors, a small protoboard and a VGA connector
>>> and
>>> a stackable 40 pin header. Got everything from a local store.
>>>
>>> But it could be done on a CPLD for reduction costs. I don't have the
>>> tools
>>> for CPLD development, nor I don't make an idea how to solder a FBGA chip
>>> .
>>> Mark Marlette ? Darren A. ? Who else ?
>>>
>>> It would require a CPLD with 550 LEs, 16K bits of RAM and a external SRAM
>>> with 512Kbytes or a SDRAM as the Altera. For a SRAM the code must be
>>> changed since the DE0-Nano has only SDRAM.
>>>
>>> Don't know if that would beat the 80 dollars asked by the Altera. But
>>> Daren
>>> made de SDC for a 50 bucks cost. Maybe that would be a reasonable price.
>>>
>>> Luis Felipe Antoniosi
>>>
>>>
>>>
>>> On Tue, Sep 30, 2014 at 9:15 AM, Gene Heskett <gheskett at wdtv.com> wrote:
>>>
>>> > On Tuesday 30 September 2014 08:02:45 Luis Antoniosi (CoCoDemus) did
>>> opine
>>> > And Gene did reply:
>>> > > colours as we say in canada:
>>> > >
>>> > > https://www.youtube.com/watch?v=zSgr5dHvswM
>>> > >
>>> > > Nick Marentes will love my scanlines :)
>>> > >
>>> > >
>>> > >
>>> > > Luis Felipe Antoniosi
>>> >
>>> > Now that is pretty darned good Luis. Cost estimate?
>>> >
>>> > Cheers, Gene Heskett
>>> > --
>>> > "There are four boxes to be used in defense of liberty:
>>> >  soap, ballot, jury, and ammo. Please use in that order."
>>> > -Ed Howdershelt (Author)
>>> > Genes Web page <http://geneslinuxbox.net:6309/gene>
>>> > US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS
>>> >
>>> > --
>>> > Coco mailing list
>>> > Coco at maltedmedia.com
>>> > https://pairlist5.pair.net/mailman/listinfo/coco
>>> >
>>>
>>> --
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>>>
>>
>>
>