DDR4 routing corners

[linux-dude]

Hi,

I have taken over a partially completed DDR4 design. I'm somewhat suspicious regarding corners that is bent more than 90 degrees as seen in the picture. I'm aware that 90 degree corners should be fine below a few GHz.

Any thoughts on this?

 

[marce]

Same, no effect.
Looks strange and rather different than any other DDR layout I have ever seen... What tool is it being designed on?

 

[linux-dude]

Thanks marce,

Yes, I compared with other DDR4 reference designs and this one looks nothing like them.

Designed in Altium.

Keep it or ditch it? :thinker:

 

[FvM]

Altium is definitely able of designing rounded meanders, unsuitable parameters chosen?

 

[linux-dude]

Thanks FvM,

the design rules are hardly used, not even length constraints are set up, except diff pairs that have 0.1mm tolerance. Obviously it's designed w/o xSignals...

I would certainly not have done it like this.

 

[cyberrat]

Jeepers creepers!

 

[marce]

My heart says ditch...