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AUBoard 15P FMCOMMS2 FMC on AU15P?
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FMCOMMS2 FMC on AU15P?

vadimv
vadimv 17 days ago

Hello,

Struggling to get the AD9361 to actually pass any sort of data back to the AU15P. The SPI is working ok, i can talk to the chip, but all LVDS data stays at 0. The AU15P J46 jumper is set so things are running on 1.8V as they should, yet there is no LVDS activity at all.

The AU15P uses HD pins for LA_07_P/N, but regardless of how that's pinned out, the other LVDS pairs ought to produce something. Here, IDELAY passes nothing into the FPGA on the receive side. 

Have FMC designs worked on this board before? Has AD9361 testing ever occurred?

Now that this board is being replaced, can we get a schematic of the current version?

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  • iksevas
    0 iksevas 16 days ago

    It looks like PG_C2M is required for that FMC card to function and Rev 1 of the AUBoard  has a BOM issue where the pull-up to enable this is not populated. It is resolved in Rev 2 due out next month.

    image

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  • vadimv
    0 vadimv 14 days ago in reply to iksevas

    I made that fix already, you recommended it in another thread. Swapping the resistors made it such that the FMCOMMS2 comes up, LED is lit, chip can be talked to over SPI and registers can be set. So the AD9361 is up - but the AU15 RX I/O on the FMC interface is completely dead, and that's the part I'm no able to change. Testing the same logic on the Zedboard (ported to 7-series) worked fine...

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  • iksevas
    0 iksevas 14 days ago in reply to vadimv

    IDELAY and ODELAY are not supported for HDIO banks per UG571.

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  • iksevas
    0 iksevas 14 days ago in reply to iksevas

    Are you able to measure the bank IO voltage??

    You can measure this at TP66 (the voltage) and TP67 (GND).

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  • vadimv
    0 vadimv 14 days ago in reply to iksevas

    Yup, got that - some of the pins are HP though - so they should work even if I can't make a full 0..5 diff pair LVDS (diff pair 5 is HD unfortunately)

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  • vadimv
    0 vadimv 14 days ago in reply to iksevas

    This is valuable info - will check and report back.

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  • vadimv
    0 vadimv 6 days ago in reply to iksevas

    Voltage TP66 -> TP67 is 1.78V, close enough to 1.8V... Seems right.

    Not sure what else could be wrong. Trying things on the Alinx card instead.

    Guys, you've got to make the schematic available. Obfuscating this is not ok, no other eval board vendor would do this.

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  • iksevas
    0 iksevas 5 days ago in reply to vadimv

    You can gain access to the schematic if you are working with your local FAE from an Avnet company. They can put a request in for you. 

    Generally though, the User Guide in the case of FMC has the information you need for FMC does it not? What’s missing?

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