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EAGLE User Support (English) freeDFM & via issue
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Related

freeDFM & via issue

autodeskguest
autodeskguest over 17 years ago

I have a board I've submitted to freeDFM. Their error report for that board

is at:

.   https://www.freedfm.com/freedfm/0011385401921358/results/summary2.htm

The .brd file (only that file) I've made available at:

.   http://www.RGMEusa.com/Misc/USBto64RW.zip

 

I've already addressed all the issues not related to vias in another board

version, my only remaining problem is the one concerning freeDFM's complaint

about every one of the board vias.

 

If you look at the freeDFM error report it appears to my eye that all the

vias have no drill and they appear to all be filled in as if they were pads

instead of vias going through all 4 layers. I've also made available a

screen shot combination picture of the board concerning just one of the via

issues (the X=0.7641", Y=2.2966" example):

.   http://www.RGMEusa.com/Misc/SampleVia.jpg

 

It all seems ok to me so I haven't a clue as to why freeDFM is complaining.

In the combo screen shot I see it reports a drill for the example via as

0.015" and a diameter of "0.031/0.031 (auto)". I don't understand the

diameter syntax being used, meaning it looks to me like it is reporting 2

parameters separated by a "/" character. What is the definition of the 2

parameters which in the screen shot are identical to each other? If one

parameter is mathematically divided by the other the result is a zero value;

is THAT the reason freeDFM is complaining?

 

I need help understanding the nature of the problem and how to fix it. I did

generate the Execellon file while the board was displayed in the editor,

that's what was sent to freeDFM. TIA!

-Ron

 

 

 

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  • autodeskguest
    autodeskguest over 17 years ago

    "Guy" <guy.dau_no_spam@free.fr> wrote in message

    news:fohqh1$sgn$1@cheetah.cadsoft.de...

    Hi,

     

    When I'm testing it I have just one DRC error with design rule

    www.my4pcb.com you have select !!!

     

    Guy

     

    PS: I'm affray, you don't use any condensators on this card !!!

    I think you must minimum add decouplers condensators to be sure work ok

    !!!

     

    Yes, that version had too tight of clearance for those 2 pins - I corrected

    that already. Annoyed me, as when I auto routed that one trace the DRC rules

    were not followed and I had to move the trace manually one grid away from

    IC1. Luckily, there is a DRC check button!

     

    Guy, this design (and the hand wired proto) definitely does not need VCC

    bypass capacitors. It's a state machine, no clocking, and the USB module

    (it's not a chip) includes its own decoupling to the USB buss; what that

    module connects to is not powered by the USB buss and it is rather slow and

    usually just sitting in one state. I do, however, need to (or should)

    increase distance between the Power class traces. I gotta rip again anyhow

    when I find out why freeDRM doesn't like the vias, I'll change the class

    then.

    -Ron

     

     

     

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  • autodeskguest
    autodeskguest over 17 years ago

    "Guy" <guy.dau_no_spam@free.fr> wrote in message

    news:fohqh1$sgn$1@cheetah.cadsoft.de...

    Hi,

     

    When I'm testing it I have just one DRC error with design rule

    www.my4pcb.com you have select !!!

     

    Guy

     

    PS: I'm affray, you don't use any condensators on this card !!!

    I think you must minimum add decouplers condensators to be sure work ok

    !!!

     

    Yes, that version had too tight of clearance for those 2 pins - I corrected

    that already. Annoyed me, as when I auto routed that one trace the DRC rules

    were not followed and I had to move the trace manually one grid away from

    IC1. Luckily, there is a DRC check button!

     

    Guy, this design (and the hand wired proto) definitely does not need VCC

    bypass capacitors. It's a state machine, no clocking, and the USB module

    (it's not a chip) includes its own decoupling to the USB buss; what that

    module connects to is not powered by the USB buss and it is rather slow and

    usually just sitting in one state. I do, however, need to (or should)

    increase distance between the Power class traces. I gotta rip again anyhow

    when I find out why freeDRM doesn't like the vias, I'll change the class

    then.

    -Ron

     

     

     

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