Hello everyone:
I am trying to place a differential pair.
I do the following steps:
- In scheme i assign name USB.
- In PCB i assign width, gap, cleareance etc. (suggestion, this can be managed on schema, one window for all track parameters)
3)I make the placement. - I need drag:
4)I press 6 and in walk around routing option an nothing never start to route
5) The differential pair propierty is w=0.265 gap=.1 clearance=.1
90 ohms for a 4 layer 0.2 first prepeg.
6) i change the board to 0.1mm first prepeg, and with the values w=19 gap=0.2 cleareance=0.4
I get error to the pin of the chip
7) I change the cleareance to 0.1, and the route didnt start without explicit reason
8) i change the cleareance to 0.3 and i can route.
IMHO Now the problem is that a cleareance of 0.3 is wrong because must be 2x W 0.4 and must be tolerated the chip connection.
Best Regards