Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Highlighted
Valued Contributor III
1,011 Views

Cyclone V A9 DDR3 calibration fail no reboot ,but JTAG is OK

Dear All, help me analysis. 

 

I have a custom board with cyclonev and DDR3 (mt41j256m16tw-107it. In quartus ii v15.1.0 (64bit) I created Uniphy external DDR3;when I download sof file to FPGA through JTAG, calibration is ok, 

 

,after i program FPGA PROM, turn off the power,when turn on power, calibration fail. 

 

 

drr3 config as flowe: 

 

 

 

i have tried many times, the voltage supply the voltage supply is ok 

VddQ 1.35V 

VTT VREF 0.678V
0 Kudos
1 Reply
Highlighted
Valued Contributor III
5 Views

How soon after power-up/configuration is the calibration done? Are the supplies stable at that point? 

 

Hold the Phy in reset for longer after power-up before allowing calibration to proceed. 

 

Cheers, 

Alex
0 Kudos