Mail Archives: geda-user/2016/01/26/14:54:03
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On Jan 26, 2016, at 11:04 AM, DJ Delorie <dj AT delorie DOT com> wrote:
>=20
>> In this day and age to say blind/buried vias are not needed is =
ridiculous.
>> The fact is ANY design that requires even one FPGA, custom ASIC or
>> medium to large BGA needs blind/buried vias.
>>=20
>> This is factual and is easy vetted.
>=20
> If you can afford a custom ASIC, you can afford a top-end EDA package,
> and a FAB that supports high-end features.
Not true. In my world, I have to do much of the EDA work in the the =
proposal and feasibility study phases. Shoestring budgets, or no budget =
at all. A big company covers this by having lots going at once, but =
Noqsi Aerospace is a tiny company (3 people at the moment, the largest =
we=92ve ever been). For our current biggest project, we went through two =
years of doing a lot of work for zero pay (but now it=92s paying off). =
We couldn=92t have afforded a top-end package during those years. We =
worked with a board designer who used Osmond PCB: not high-end, but it =
has blind and buried vias. He was much faster and more accurate than the =
big-$$ contractors who use the high-end software.
> Frankly, PCB is not a
> high-end package and custom ASIC users are not our target audience.
But gschem can do schematic capture for ASIC even though that=92s not =
its target. The difference is that gschem doesn=92t limit what you can =
draw. It=92s quirky and limits *how* you can express what you need, but =
I=92ve never found it incapable of expressing a circuit. It gives you a =
few crude primitives and a few ways to compose more complex objects from =
simple objects. A few layers of that, and you have a 6000 component =
mixed-signal ASIC.
Pcb says to the user =93my way or the highway=94. Gschem says =93live =
with my quirks, and I=92ll help you do anything=94.
>=20
> I can't afford any of that tech. Heck, I can barely afford 4-layer
> boards with 6/6 rules. There's a huge community of designers that
> can't (or won't) afford high tech features in their boards.
I never thought I=92d do ASIC design until a customer asked me to try =
it.
Yogi Berra =97 'It's tough to make predictions, especially about the =
future.=92
>=20
> So you can say "this is factual" but it's not. It may be a
> requirement for a subset of our potential user base, but it's not
> ridiculous to assume that many people just aren't going to use them.
> Until we decide to support that tech, we're simply targetting the
> "many people" who don't need them.
>=20
John Doty Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd AT noqsi DOT com
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