Design rules editor?

[bianchi]

Dear Kicad Member,

I have a question related with “Diff Pair Width” and “Diff Pair Gap”
What’s it related with ?
What’s the value for it ?

Any practical links explain it ?

Thanks

[Rerouter]

The latest version of kicad i have used is 4.0.6, so it may be different on .7 or the nightlies.

On my version, it related to the openGL differential pair router, the width was the width of each of the tracks, the gap was the space between them, e.g. for USB traces on my last 4 layer board, was 0.3mm trace widths, seperated by a 0.2mm gap

[bianchi]

How to mark it in the schematic ?

For example

USBP+

USBP-

?

[Rene_Poschl]

Net names for differential pair router

Hello, i need to use differential pair routing for USB signals, but net names in pcbnew does not correspond to pin names of the IC from schematic (some of them acually do, but not all). For example: IC component in eeschema has DM0- and DP0+ pins, but corresponding nets after netlist export are named like Net-(P3-Pad2), Net-(P3-Pad3), etc… As i see i am not supposed to rename nets in pcbnew, or in eeschema (to add + - signs). How else can i make particular IC pins become differential pair? I use…

Differential Routing in KiCAD

[Rerouter]

The rules as of 4.0.6 where both USBP_P / USBP_N and USBP+ / USBP- are valid for describing a differential pair, You label those traces with those names, and the differential routing will pick up on it.

I’m not sure if its been improved, but most of my use of the router required some followup tweaking to make it connect to the pads like how i desired. (mainly did not like the pitch of the QFP being thinner than the pair gap.

For clarity, the device in the middle is an ESD protection chip.