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problems find when simulate UniPHY + DDR2

XQSHEN
Novice
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IP: UniPHY with DDR2 controller

Quartus Prime Standard 18.0

Simulation: Nios 2 + Uniphy + Micron DDR2 (MT47H128M16)

Modelsim-intel is used.

Problem: it stops during ddr2 initialization phase. It seems Uniphy IP doesn't follow Micron DDR2 initialization spec. I don't there is 200us which was required by datasheet.

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IntelSupport
Community Manager
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Hi Xiaoqiang Shen,

 

UniPHY simulation does not adhere to the initialization timing to speed up the simulation so it will fail when using the Micron memory model. I assume the simulation passes with the DDR2 example design with Intel generated memory model. As a workaround, you can comment out the initialization time check in the Micron memory model.

 

Hope this helps.

 

Thanks,

Rashmi



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IntelSupport
Community Manager
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Hi Xiaoqiang Shen,


Thank you for submitting the case. Will it be possible for you to share your design files to reproduce the issue at my end and further investigate.


Regards,

Rashmi


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XQSHEN
Novice
1,053 Views

design files has been sent to you by email.

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IntelSupport
Community Manager
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Hi Xiaoqiang Shen,

 

UniPHY simulation does not adhere to the initialization timing to speed up the simulation so it will fail when using the Micron memory model. I assume the simulation passes with the DDR2 example design with Intel generated memory model. As a workaround, you can comment out the initialization time check in the Micron memory model.

 

Hope this helps.

 

Thanks,

Rashmi



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XQSHEN
Novice
1,050 Views

1)  Actually its defined the tINIT = 200us when launch this UniPHY IP. The parameter is also compliant with Micron datasheet. Why UniPHY IP doesnt consider it as it knows exact memory parameter.

2) If you look at my first question attachments, you will see UniPHY IP doesn't follow memory initialization sequence.  For example: cke should stay 200us when power up.

1.JPG

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IntelSupport
Community Manager
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Unfortunately, UniPHY simulation does not adhere to the initialization timing to speed up the simulation so it will fail when using the Micron memory model.


Which simulation option they have selected. You probably have "skip calibration" selected which is the default.Please change the setting to "full calibration" to get past the error but it will take forever (~4 days) to complete.



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XQSHEN
Novice
1,045 Views

I used +define+ALTERA_ALT_MEM_IF_PHY_FAST_SIM_MODEL=0  in related files nios_mem_if_ddr2_emif_0_p0.sv and nios_mem_if_ddr2_emif_0_pll0.sv.

And modelsim shows message: # Using Regular core emif simulation models.

But it still doesn't work.

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Rashmi1
Employee
1,022 Views
Does this latest sim run much longer than the previous simulation? It should if you are running full calibration
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Rashmi1
Employee
1,021 Views

 

Does this latest sim run much longer than the previous simulation? It should be running full calibration

 

 

Can you please check how long mem_reset is asserted? It should stay low for at least 200usec in full calibration mode

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XQSHEN
Novice
1,015 Views

It stops at the same position. Nothing changed.

 

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IntelSupport
Community Manager
1,021 Views

Does this latest sim run much longer than the previous simulation? It should if you are running full calibration


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IntelSupport
Community Manager
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Does this latest sim run much longer than the previous simulation? It should be running full calibration



Can you please check how long mem_reset is asserted? It should stay low for at least 200usec in full calibration mode



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