SeanS PostedAugust 30, 2019 Share PostedAugust 30, 2019 Hello, I have a Genesys 2 board and was wondering if there is 100 ohm line to line controlled impedance routing for differential pairs that go to the HA, HB, and LA banks on the FMC connector. -Sean Link to comment Share on other sites More sharing options...
0 jpeyron PostedAugust 30, 2019 Share PostedAugust 30, 2019 Hi@SeanS, Looking at the Genesys 2schematicthere is not a 100 ohm line to line controlled impedance routing for differential pairs that go to the HA, HB, and LA banks on the FMC connector. best regards, Jon Link to comment Share on other sites More sharing options...
0 SeanS PostedAugust 30, 2019 Author Share PostedAugust 30, 2019 The schematic shows that a differential pair constraint was added (two red eye looking probe thingies). I should have looked here sooner. But a colleague mentioned that the constraint may not have been used in the layout. Do you know the person who laid out the board? Perhaps he can confirm the 100 ohm line to line impedance? Link to comment Share on other sites More sharing options...
0 vicentiu PostedSeptember 4, 2019 Share PostedSeptember 4, 2019 Yes, we confirmed with the engineer that the 100 ohm impedance is there. It is part of the FMC spec. Link to comment Share on other sites More sharing options...
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SeanS
Hello,
I have a Genesys 2 board and was wondering if there is 100 ohm line to line controlled impedance routing for differential pairs that go to the HA, HB, and LA banks on the FMC connector.
-Sean
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