> From: RAD [mailto:[EMAIL PROTECTED]
> 
> My problem is as follow:
> 
> ...i have a little problem when place the only one 
> component in "metric" unit, the component is a CS8900Q and i 
> can't put this component in (imperial) grid :(

Sure you can. Pre-wire the TQFP-100 into an imperial grid of your liking,
using a sub-mil grid to attach its pads into the larger grid. Then route the
board connections at the larger grid size into the pre-wired "cell"...

Point is, just because you're in imperial "mode",  you're really not
constrained to working in a 25mil grid at _all_ times. If you require an
alteration to your working grid, then change it to whatever is necessary to
accomplish the job (within reason that is). If 99% of the circuit can be
routed using a 25mil grid, great. If the last tidbit requires a shift to a
finely spaced grid, then change the grid size to suit your need.

Just don't under any circumstances changes the mode while "in-filght". Too
much of a possiblity of Protel-introduced error. There are posts in the
archive that outline the problem in some detail, but basically it is a
mathematical oversight on the part of Protel's management, as follows:

Let $=profit
let t=truth

        $>t

r,

aj


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