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Altera_Forum
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16 years ago

Arria II GX DDR2 issues with .QSF file

I have been banging my head against a wall for the last day and I hope I can get a solution to this. Challenge: Generated a HPCII DDR2 controller using the Megawizard, not an issue. The top ...
Altera_Forum's avatar
Altera_Forum
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16 years ago

The IO standard should be "differential sstl-18 class i". If you do not specify that, Quartus will think you are doing single-ended DQS signals. In the pin planner, choose the Differential SSTL-18 Class I from the drop down list. You should a line like this:

set_instance_assignment -name io_standard "differential 1.8-v hstl class i" -to mem_dqs[0]

(adjust for pin name if it is not mem_dqs)