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 slots in 15.2 

Last post Wed, Apr 5 2006 10:54 AM by archive. 6 replies.
Started by archive 05 Apr 2006 10:54 AM. Topic has 6 replies and 1610 views
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  • Wed, Apr 5 2006 10:54 AM

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    slots in 15.2 Reply

    Hi all,

    We are trying to take advantage of the new slot capablities in 15.2. Can anyone tell me if an NC ROUTE file is REQUIRED to fabricate a board using slots defined with this new type of padstack? When I tried it on a test board, the ncdrill.log file showed no reference to the slot, so I am assuming they are not making it into the ncdrill.tap output.

    We typically do not supply an NC ROUTE file to our fab vendor, but instead supply the board outline and a dimensioned fab drawing. If an NC ROUTE path layer is required to produce slots in boards, then perhaps we should supply one for the board outline as well. I am struggling with ncroutebits.txt though. How are we to know what tool (bit) size the fab vendor plans to use to route the board? I searched for a default ncroutebits.txt file in my Cadence heirarchy and can't find one.

    Any help would be greatly appreciated.

    Thanks,

    Chris


    Originally posted in cdnusers.org by cnunn
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  • Wed, Apr 5 2006 11:13 AM

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    RE: slots in 15.2 Reply

    You need  to produce a route output - what fun!

    ncroutebits.txt
    0.6 T200
    0.65 T201
    0.7 T202
    0.75 T203
    0.8 T204
    0.85 T205
    0.9 T206
    0.9271 T207
    0.95 T208
    1 T209
    1.05 T210
    1.1 T211
    1.15 T212
    1.2 T213
    1.25 T214
    1.3 T215
    1.35 T216
    1.4 T217
    1.45 T218
    1.5 T219
    1.55 T220
    1.6 T221
    1.65 T222
    1.7 T223
    1.75 T224
    1.8 T225
    1.85 T226
    1.8542 T227
    1.9 T228
    1.95 T229
    2 T230
    2.05 T231
    2.1 T232
    2.15 T233
    2.2 T234
    2.25 T235
    2.3 T236
    2.35 T237
    2.4 T238


    Originally posted in cdnusers.org by GigaDyne
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  • Wed, Apr 5 2006 11:48 AM

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    RE: slots in 15.2 Reply

    Thanks GigaDyne,

    It is my understanding there is not an absolute mapping of Tcode to drill size - it can be generated randomly.  Is this your understanding?

    Chris


    Originally posted in cdnusers.org by cnunn
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  • Wed, Apr 5 2006 12:09 PM

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    RE: slots in 15.2 Reply

    Hi Chris,

    We also do not typically send an NC Route file to the vendor either, but we have in some instances started defining slots within pad designer.   This at least provides an easy way of having the slot show up in the drill legend.  We still provide an outline of the slots on the board_geometry/outline layer as well as dimension and provide a detail of them on the Fab drawing.   We usually don't use many slots on a board, so doing it this way is not a big deal for us. 

    Regards,

    Randy


    Originally posted in cdnusers.org by rb
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  • Wed, Apr 5 2006 12:21 PM

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    RE: slots in 15.2 Reply

    Thanks for the reply Randy.

    What concerns me with the new slot definition is I don't see them output in the ncdrill.log file, and I can't tell if they actually exist in the ncdrill.tap file - I doubt they do! 

    Up until now we have specified a slotted padstack using 2 drills (1 at each end) for slots which are longer that 1X the width, and using a single drill for the smaller slots.  In the case of the single drill there has alway been the possiblity that the slot won't be rotated properly.  That is where you have to dig in and actually draw the outline of the slot and either provide a picture of it and/or dimension it. 

    I thought the whole reason for Cadence addressing slots was to eliminate the need for all of this supporting documentation and get things embedded into the design.  But if people aren't using nc_route, then they must not be using these slotted padstacks other than for the drill chart - as you say.

    Chris


    Originally posted in cdnusers.org by cnunn
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  • Wed, Apr 5 2006 12:42 PM

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    RE: slots in 15.2 Reply

    Hi Chris,

    They definitely do not show up in the ncdrill.tap file,  thus the need for the dimensioning(including slot radius) on the fab drawing.   In the past and still today we sometimes will position one drill with a non-standard/unique drill size in the center of the slot.  Then we manually modify the drill legend to indicate the slot.

    I can understand the rational for putting the slot data in the NC Route file,  but I agree that releaseing a NC Route file does not seem to be a standard practice thus significantly diminishing the value of the slot capability.

    Randy


    Originally posted in cdnusers.org by rb
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  • Wed, Apr 5 2006 1:26 PM

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    RE: slots in 15.2 Reply

    file upload test


    Originally posted in cdnusers.org by lindam
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  • Thu, Apr 20 2006 1:42 PM

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    RE: slots in 15.2 Reply

    It has shown in the fab drawing file, right? pls don't worry about it.


    Originally posted in cdnusers.org by Alex1202
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Started by archive at 05 Apr 2006 10:54 AM. Topic has 6 replies.