Forum Discussion

SYiwe's avatar
SYiwe
Icon for Occasional Contributor rankOccasional Contributor
7 years ago

What's the reason of “Write per-bit deskew fail” during DDR4 calibration

Hi everyone, Arria10 SoC DDR4 Interface calibration failed at the stage "write per-bit deskew", is there any Intel employee or FPGA customer knows the reason? PCB design problem? Power supply prob...
SYiwe's avatar
SYiwe
Icon for Occasional Contributor rankOccasional Contributor
6 years ago

If your JTAG circuit is correct, probably beacuse your download cable doesn't support Arria10. I suggest you to change to a newer download cable, and it's better to be produced by Altera.

Regards.

阳石000's avatar
阳石000
Icon for New Contributor rankNew Contributor
6 years ago

The problem has been solved.I changed a USB BLASTER II. THANKS!

I have a new problem.

When I download jjc file to EPCQL1024 through JTAG interface, an error occurs "Error (209014): CONF_DONE failed to go high in device".

Observe DCLK with an oscilloscope and find that there is no clock and nCSO is not pulled down.(EPCQL1024 replaced by MT25QU01G)

Have you ever had such a problem？

Thanks, regards.