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ProgAddicted's avatar
ProgAddicted
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1 year ago

Cyclone V GX and alt_iobuff_diff

I'm developing a LPDDR2 controller for Cyclone V GX Starter kit and i have problems with DQS differential bidirectional interface: using ALT_IOBUF_DIFF i get an error message "..Primitive ALT_IOBUFF_...
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ProgAddicted's avatar
ProgAddicted
Icon for New Contributor rankNew Contributor
1 year ago

Tanks for the reply.

Unfortunately ALTDDIO only deals with Double Data Rate and not with bidirectional DIFFERENTIAL pins.

I will use ALTDDIO for Data and Address pins, but i need a solution for differential bidirectional DQS pins.

Any idea?

  • FvM's avatar
    FvM
    Icon for Super Contributor rankSuper Contributor
    1 year ago

    Hi,
    are you explicitely instantiating ALT_IOBUF_DIFF? If so, why?