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 Bus to bus wire spacing in Allegro 

Last post Mon, Dec 11 2006 3:37 AM by archive. 6 replies.
Started by archive 11 Dec 2006 03:37 AM. Topic has 6 replies and 1323 views
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  • Mon, Dec 11 2006 3:37 AM

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    Bus to bus wire spacing in Allegro Reply

    I want to create a bus to bus wire spacing rule in Allegro.
    I have a board with several busses on it and I want to have a distance between the wires of one bus to the wires of all the other busses of twice the normal spacing. 
    How can I define this in Allegro? 


    Originally posted in cdnusers.org by pcb_hevi
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  • Mon, Dec 11 2006 7:29 PM

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    RE: Bus to bus wire spacing in Allegro Reply

    you can define three Net Spacing rules say BUS1, BUS2 and BUS3.Map this in the assign ment table as below,

    BUS1 BUS1  BUS1
    BUS2 BUS2 BUS2
    BUS1 BUS2 BUS12 or see the picture file attached.

    this worked for me. Get back me if you have any issues.

    Cheers and Good Luck!!!
    Raj.


    Originally posted in cdnusers.org by rajpcb
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  • Mon, Dec 11 2006 7:31 PM

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    RE: Bus to bus wire spacing in Allegro Reply

    Oops... its not BUS3 its BUS12 I used...


    Originally posted in cdnusers.org by rajpcb
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  • Tue, Dec 12 2006 6:51 AM

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    RE: Bus to bus wire spacing in Allegro Reply

    Thanks Raj, but I have 32 Busses on my board, so I think this is not the way I can handle it.
    Is there any other possibility to handle the bus to bus space in a convenient way?


    Originally posted in cdnusers.org by pcb_hevi
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  • Tue, Dec 12 2006 8:11 AM

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    RE: Bus to bus wire spacing in Allegro Reply

    Here are some other considerations/alternatives:

    How many different spacing rules do you need? I'm guessing that you probably don't need a different spacing constraint set for each bus. If you don't need a different spacig rule for each bus, you can probably get by with only a few different Net Spacing constraint sets. The spacing assignment table would be set up as shown below

    bus1 bus1 no_type 5mils
    bus1 bus2 no_type 10mils
    bus1 no_type no_type 10mils
    bus2 bus2 no type 5mils
    bus2 no_type no_type 10mils
    bus3 bus1 no_type 10mils
    bus3 bus2 no_type 10mils
    bus3 bus3 no_type 5mils
    bus3 no_type no_type 10mils

    Also, if some of the buses are physically isolated from each other on the board and/or are assigned to different layers for routing , these buses could probably be grouped together into one net spacing property like bus_10_15. In the following example buses 10 thru 15 would never get near each other because they are either physically in different areas of teh board, or they are being forced to route on different routing layers from each othe with a net physical rule. The assignment table would look like:

    bus_10_15 no_type no_type 10mil
    bus_10_15 bus_10_15 no_type 5mil


    Randy


    Originally posted in cdnusers.org by rb
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  • Thu, Jan 31 2008 8:52 PM

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    RE: Bus to bus wire spacing in Allegro Reply

    Hello,

    I have 5 different buses in my board. Net spacing within each bus is 12 mils and spacing inbetween different buses is 16mils.How can i set these values in Allegro15.7.
    Could anyone clarify me.

    Thank u
    sandhya


    Originally posted in cdnusers.org by sandhya.im
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  • Thu, Jan 31 2008 11:33 PM

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    RE: Bus to bus wire spacing in Allegro Reply


    The settings are same as above give by Raj and Randy. Try it. And get back if you have any difficult.

    Regards,
    Shiva...


    Originally posted in cdnusers.org by shiva
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Started by archive at 11 Dec 2006 03:37 AM. Topic has 6 replies.