Calculated diff pair spacing
w
wadam00
Hello! I have an issue when using calculated diff pairs i have 2 problem when i make a minimum trace width rule the trace of the calculated dif pair sometimes are smaller for example if you try a 1mm min trace width the trace will be the same calculated (probably less than 1mm) the second and the most annoying problem is that the spacing does not change, if you check my current design which i attached the spacing does not change even if i add a minimum keepout rule.
c
collinsemasi
Regarding the first issue about minimum trace width, I'm unable to reproduce it. Could you please add some traces to the project
c
collinsemasi
Hey there wadam00, Thanks for reaching out regarding these issues.
Let's start with the Second problem about spacing. I've noted that in the shared project, the
Keep Out Minimum
rule has been added to the Layout
object. This is probably the reason why it is not actually being applied to the traces. Here are two ways in which you can use the Keep Out Minimum
rule:- Applied to individual nets – When you attach the rule directly to a net, it automatically propagates to all the traces belonging to that net. In this case you can opt to apply the rule to the HOST_D-and theHOST_D+nets
- Secondly, if you want to apply the rule to all nets, you can use the selector based layout rules as illustrated in the annotated screenshot attached
NOTE: After adding the
Keep Out Minimum
rule you might have to re-draw the trace and they should now obey the keepout rule