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ACamp22's avatar
ACamp22
Icon for New Contributor rankNew Contributor
5 years ago

RGMII MAC with ALTDDIO not working in Cyclone 10

We have a VHDL MAC core (supporting RGMII and GMII) and we are trying to port a RGMII design to a Cyclone 10. We found out ALTDDIO (both IN and OUT) are no more supported adn that we should use an G...
Deshi_Intel's avatar
Deshi_Intel
Icon for Regular Contributor rankRegular Contributor
5 years ago

Hi Andrea,

Pls see my comment below.

  1. Is there any way to use simple double data rate IO in a cyclone 10 ?
  • I presume you are Altera veteran user that's familiar with WYSIWYG or megawizard usage model.
    • Yet, the design practice has changed. Right now we only recommend customer to use IP core and not some low level design instance anymore to avoid breaking Quartus design compilation flow.
    • The replacement IP for DDIO in Cyclone 10 GX device is indeed GPIO IP.
  1. Regarding RGMII support on Cyclone 10 FPGA
  • Unfortunately as explained in the KDB link that you found out as well, RGMII can't be supported anymore on Cyclone 10 GX due to FPGA GPIO circuit architecture changes
    • We can only advise customer to switch to GMII or SGMII

I apologize for the inconvenience and appreciate your understanding at the same time.

Regards,

dlim