Re: gEDA-user: transition of pcb internal units to metric (SI, mm)

[rickman <gnuarm.geda@xxxxxxxxx>]

   On 2/7/2011 4:05 PM, Markus Hitter wrote:

     Am 07.02.2011 um 19:37 schrieb Colin D Bennett:

     This has been discussed on the list before and the proper answer is
     to
     use 64-bit integers representing length in nanometers.

     Isn't a nanometer pretty big when doing chip design? Others might
     have more/any experience in this area.

   No, you have a misapprehension.  The finest devices in production today
   are on the order of 20 nm.  That will decrease, but not too much
   further.  If not limited by physics, by economics.
   From Wikipedia:
   The cost to [1]tape-out a chip at 90 nm is at least US$1,000,000 and
   exceeds US$3,000,000 for 65 nm.^[2][40]
   Do you expect these tools to be used to design chips costing far, far
   over $3 Million just for the mask set?
   Rick

References

   1. http://en.wikipedia.org/wiki/Tape-out
   2. http://en.wikipedia.org/wiki/Moore%27s_law#cite_note-39


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