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Hello
I have a pcb with ddr pins (one dqs, one dm and two dq on 16-bit) assigned to wrong pins of Cyclone3. I think that altmemphy can work at lower frequence, am I right? Quartus report that it is error and don't finished compilation How can I compile design?Link Copied
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ALT_MEMPHY is a stubborn thing and your compilation will keep failing, no matter what frequency, because the incorrectly routing pins can not be connected to the internal resources used by ALT_MEMPHY.
Depending on what you expect to do with the board :- If you want to use other Altera IP you have to correct the PCB
- In the other case you could develop your own phy, together with your own controller, which is a rather big undertaking.
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Thank you, you are right. I am looking for DDR-controller on opencores
Cyclone3 have upper frequency for DDR-controller 200 MHz, so I think that mobile DDR is more suitable. Current design isn't my own so my task is force it to work.- Mark as New
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With hindsight, after a night of sleep, I must admit that my advice isn't that good. Even if you fabricate your own PHY (and controller) you (probably) need a fed-back clock signal to register the incoming data. In principle you can use any pin and designate it as 'inout' but that is not exactly the same as feeding a clock out on a pin and taking it back in on another pin. (My tests so far haven't been very conclusive about that).
So the safest way out is to correct the PCB, I guess.- Mark as New
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i am also trying to use altmemphy in cyclone 3 de0 kit but error on fitter anybody help me
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