FPGA Configuration

Hello VLSI Engineers.

     Its is true that FPGA boots its program from an external PROM.
How external eproms are connected to FPGA. Is there any requirement in
making PCB with FPGA.

Thanks

On 29 Okt., 11:46, vlsi_freak <clickonjas...@gmail.com> wrote:
> Hello VLSI Engineers.
>
>      Its is true that FPGA boots its program from an external PROM.
> How external eproms are connected to FPGA. Is there any requirement in
> making PCB with FPGA.
>
> Thanks

1 yes
2 read the documentation
3 yes read the documentation

>Hello VLSI Engineers.
>
>     Its is true that FPGA boots its program from an external PROM.
>How external eproms are connected to FPGA. Is there any requirement in
>making PCB with FPGA.
>
>Thanks

First make sure you have a stable 6.3V AC heater supply (50Hz or 60Hz
is fine). The configuration bit stream is modulated onto this using
QPSK (http://en.wikipedia.org/wiki/Phase-shift_keying).

You don't need HT during configuration, but a negative grid bias will
keep down leakage currents.

I think we should give any new poster more than only a single chance
to make a fool of himself, before we start giving funny non-advice.
Peter Alfke

On Oct 29, 4:13 am, MikeShepherd...@btinternet.com wrote:
> >Hello VLSI Engineers.
>
> >     Its is true that FPGA boots its program from an external PROM.
> >How external eproms are connected to FPGA. Is there any requirement in
> >making PCB with FPGA.
>
> >Thanks
>
> First make sure you have a stable 6.3V AC heater supply (50Hz or 60Hz
> is fine). The configuration bit stream is modulated onto this using
> QPSK (http://en.wikipedia.org/wiki/Phase-shift_keying).
>
> You don't need HT during configuration, but a negative grid bias will
> keep down leakage currents.

>I think we should give any new poster more than only a single chance
>to make a fool of himself, before we start giving funny non-advice.
>Peter Alfke

It depends on how lazy they seem to be.  Where someone clearly has
made no significant effort to discover simple information for
themselves, why should we make a serious reply?  My experience is that
those whose first resort is to ask someone else will continue to do it
until discouraged.  I'd guess they are the people whose parents peeled
apples for them.

Since you work for a vendor, perhaps it's your job continually to
spoon-feed those who find it tiresome to open a book, to spend a few
seconds on Google or, in this case, to download the manufacturer's
data sheet.  The rest of us don't have time for lazy people.  There
are enough serious problems to be addressed.

Good apple-peeling analogy.
Spoiled brats, too lazy to think, read, or google...
Peter

On Oct 29, 9:11 am, MikeShepherd...@btinternet.com wrote:
> >I think we should give any new poster more than only a single chance
> >to make a fool of himself, before we start giving funny non-advice.
> >Peter Alfke
>
> It depends on how lazy they seem to be.  Where someone clearly has
> made no significant effort to discover simple information for
> themselves, why should we make a serious reply?  My experience is that
> those whose first resort is to ask someone else will continue to do it
> until discouraged.  I'd guess they are the people whose parents peeled
> apples for them.
>
> Since you work for a vendor, perhaps it's your job continually to
> spoon-feed those who find it tiresome to open a book, to spend a few
> seconds on Google or, in this case, to download the manufacturer's
> data sheet.  The rest of us don't have time for lazy people.  There
> are enough serious problems to be addressed.

<MikeShepherd564@btinternet.com> wrote in message 
news:refbi3lc7d4i9ied5r673sc4bg2d1ucgv9@4ax.com...
> >Hello VLSI Engineers.
>>
>>     Its is true that FPGA boots its program from an external PROM.
>>How external eproms are connected to FPGA. Is there any requirement in
>>making PCB with FPGA.
>>
>>Thanks
>
> First make sure you have a stable 6.3V AC heater supply (50Hz or 60Hz
> is fine). The configuration bit stream is modulated onto this using
> QPSK (http://en.wikipedia.org/wiki/Phase-shift_keying).
>
> You don't need HT during configuration, but a negative grid bias will
> keep down leakage currents.

Hi Mike,
As it happens, this came up at the weekend in a discussion with some old 
friends I hadn't seen for a while. I agree with you that it's a good idea to 
configure the FPGA with a valves. (Tubes in the US). The bits are warmer and 
more rounded. (This latter property is useful in fixed point DSP 
implementations). Although transistor fed bits are cleaner, the valve fed 
bits have more air. It is absolutely vital that, whether using solid state 
or vapour state programming, the configuration traces on the PCB are made of 
oxygen free copper. Otherwise, the bits get too much air. I expect.
HTH., Syms.

p.s. http://www.randi.org/jr/2007-09/092807reply.html#i4

"Symon" <symon_brewer@hotmail.com> wrote in message 
news:fg54ik$ltu$1@aioe.org...
> <MikeShepherd564@btinternet.com> wrote in message 
> news:refbi3lc7d4i9ied5r673sc4bg2d1ucgv9@4ax.com...
>> >Hello VLSI Engineers.
>>>
>>>     Its is true that FPGA boots its program from an external PROM.
>>>How external eproms are connected to FPGA. Is there any requirement in
>>>making PCB with FPGA.
>>>
>>>Thanks
>>
>> First make sure you have a stable 6.3V AC heater supply (50Hz or 60Hz
>> is fine). The configuration bit stream is modulated onto this using
>> QPSK (http://en.wikipedia.org/wiki/Phase-shift_keying).
>>
>> You don't need HT during configuration, but a negative grid bias will
>> keep down leakage currents.
>
> Hi Mike,
> As it happens, this came up at the weekend in a discussion with some old 
> friends I hadn't seen for a while. I agree with you that it's a good idea 
> to configure the FPGA with a valves. (Tubes in the US). The bits are 
> warmer and more rounded. (This latter property is useful in fixed point 
> DSP implementations). Although transistor fed bits are cleaner, the valve 
> fed bits have more air. It is absolutely vital that, whether using solid 
> state or vapour state programming, the configuration traces on the PCB are 
> made of oxygen free copper. Otherwise, the bits get too much air. I 
> expect.
> HTH., Syms.
>
> p.s. http://www.randi.org/jr/2007-09/092807reply.html#i4

I can understand the differences in air, but as much as the marketers and 
"electrophyles" talk about it, I just can't tell any difference in bit 
roundness. 

On Oct 29, 3:23 pm, "John_H" <newsgr...@johnhandwork.com> wrote:

>
> I can understand the differences in air, but as much as the marketers and
> "electrophyles" talk about it, I just can't tell any difference in bit
> roundness.- Hide quoted text -
>

0 is the round bit
1 is the pointy bit

KJ

On Oct 29, 2:23 pm, "John_H" <newsgr...@johnhandwork.com> wrote:
> "Symon" <symon_bre...@hotmail.com> wrote in message
>
> news:fg54ik$ltu$1@aioe.org...
>
>
>
> > <MikeShepherd...@btinternet.com> wrote in message
> >news:refbi3lc7d4i9ied5r673sc4bg2d1ucgv9@4ax.com...
> >> >Hello VLSI Engineers.
>
> >>>     Its is true that FPGA boots its program from an external PROM.
> >>>How external eproms are connected to FPGA. Is there any requirement in
> >>>making PCB with FPGA.
>
> >>>Thanks
>
> >> First make sure you have a stable 6.3V AC heater supply (50Hz or 60Hz
> >> is fine). The configuration bit stream is modulated onto this using
> >> QPSK (http://en.wikipedia.org/wiki/Phase-shift_keying).
>
> >> You don't need HT during configuration, but a negative grid bias will
> >> keep down leakage currents.
>
> > Hi Mike,
> > As it happens, this came up at the weekend in a discussion with some old
> > friends I hadn't seen for a while. I agree with you that it's a good idea
> > to configure the FPGA with a valves. (Tubes in the US). The bits are
> > warmer and more rounded. (This latter property is useful in fixed point
> > DSP implementations). Although transistor fed bits are cleaner, the valve
> > fed bits have more air. It is absolutely vital that, whether using solid
> > state or vapour state programming, the configuration traces on the PCB are
> > made of oxygen free copper. Otherwise, the bits get too much air. I
> > expect.
> > HTH., Syms.
>
> > p.s.http://www.randi.org/jr/2007-09/092807reply.html#i4
>
> I can understand the differences in air, but as much as the marketers and
> "electrophyles" talk about it, I just can't tell any difference in bit
> roundness.

The more round the bits, the better they take the corners...

Andy