Paul,
Forgot the yield question. In a qualified, well process managed board shop
very high yields are achieved (over 90%) up to 16 layers - piece of pie. For
those in the 4 to 8 layer range, in production, over 95% yields are common
depending on what you need again as size, features, hole sizes, via types,
electrical characteristics, etc.
Earl
----- Original Message -----
From: Paul Klasek <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, August 27, 1999 4:25 PM
Subject: Re: [TN] In Circuit Test
> interesting , how thick is 52 ? (just curious) .
> Earl we have the layers cost dilemma here :
> What would be ratios of yields and costs from simple double sided FR4 ;
> to 4 layers, 6, 8, >>> etc. ?
>
> And why even's only ; no odd layers ever ?
>
> thanks paul
>
>
> -----Original Message-----
> From: Enter your name here [mailto:[log in to unmask]]
> Sent: Saturday, 28 August 1999 8:22
> To: [log in to unmask]
> Subject: Re: [TN] In Circuit Test
>
>
> Your 2 cents noted. No biggy, but we build bare boards up to 52 layers
and
> loaded cost over too many thousands. Even our cheap stuff ain't cheap. DFM
> and T is critical. It just can't happen without concurrent engineering
> including all responsible "experts" from design through test.
>
> Earl Moon
> ----- Original Message -----
> From: Darrel Therriault <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Friday, August 27, 1999 11:35 AM
> Subject: Re: [TN] In Circuit Test
>
>
> > TechNet....
> >
> > I'd like to put in my $.02 for DFT......
> >
> > We specify 100% netlist coverage for ICT unless there is a compelling
> design
> > reason why a net can not be accessed. It's part of our Mfg DFT
> requirements.
> >
> > The rationale.....our boards are expensive and complex. Having to scrap
> > out or spend
> > a lot of debug time at Functional costs a lot more in time and resources
> > then adding
> > some test points or taking up a little more real estate or adding a
> > layer. I think if you
> > look at the cost implication of production and service/customers it
works
> > out to a
> > much bigger advantage to have ICT at the highest level possible.
> >
> > DT
> >
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