Onyx vmebus jumpers / card order - Printable Version
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Onyx vmebus jumpers / card order - Noris - 11-08-2019
Any idea where to find these jumpers on later Kona backplanes? The rackmount docs picture them just to the right of 1st vme slot (figure seems to be deckside board) but they are nowhere to be found on mine.
The vcam occupys the 1st vme slot, and ge, the last. Need I worry about jumpers / card order / spare slots in this case?
RE: Onyx vmebus jumpers / card order - mosiniak - 11-08-2019
They are on the other side of this PCB (where power regulators are inserted). You can see them in the photo You attached
RE: Onyx vmebus jumpers / card order - jan-jaap - 11-08-2019
The VME jumpers are normally only needed if you skip a VME slot when installing VME cards. If you don't (or have no VME cards at all) they are irrelevant.
RE: Onyx vmebus jumpers / card order - mosiniak - 11-08-2019
(11-08-2019, 01:45 PM)jan-jaap Wrote: The VME jumpers are normally only needed if you skip a VME slot when installing VME cards. If you don't (or have no VME cards at all) they are irrelevant.In my configuration there are no jumper and all boards are visible. Noris why are looking for these jumpers?
RE: Onyx vmebus jumpers / card order - Noris - 11-08-2019
(11-08-2019, 01:52 PM)mosiniak Wrote:(11-08-2019, 01:45 PM)jan-jaap Wrote: The VME jumpers are normally only needed if you skip a VME slot when installing VME cards. If you don't (or have no VME cards at all) they are irrelevant.In my configuration there are no jumper and all boards are visible. Noris why are looking for these jumpers?
Ah ha thanks yes I've found them. Currently they are all empty, which should be ok.
Just something I wanted to check out... because I was thinking the ge was in a vme slot but it totally isnt!!!
RE: Onyx vmebus jumpers / card order - mosiniak - 11-08-2019
GE does not use VME bus. It is connected via FCI (routed on the backplane from IO4).
RE: Onyx vmebus jumpers / card order - jan-jaap - 11-08-2019
(11-08-2019, 01:52 PM)mosiniak Wrote: In my configuration there are no jumper and all boards are visible.That's the expected behavior.
The VME interrupt lines are daisy chained from one VME slot to the next. If there's an empty slot, the chain is interrupted and cards will probably not work. That's when you need to install VME jumpers. This is also why you normally install VME cards left to right, starting from the VCAM.
The Onyx uses VME only for options like V/FDDI, ATM or the crappy 100Mbit ethernet card. The core of the system uses it's own Everest bus and will boot up fine even if the VME bus segment is configured incorrectly. The older systems like the Professional Series are *much* more sensitive to this because they use VME as their system bus. I had to deal with a cocktail of broken cards and a mis-configured VME backplane when I brought my Professional Series 4D/70 GT back to life. Took me a while to sort that all out.