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

How to set a Triple-Speed Ethernet (TSE) IP to operate in SGMII at 100 Mbps in a Cyclone V GT?

Hello. We are using a TSE IP on a Cyclone V GT, configured as follows: Core variation: 10/100 / 100Mb Ethernet MAC with 1000BASE-X / SGMII PCS Interface: MII / GMII Transceiver Type: GXB This...
Deshi_Intel's avatar
Deshi_Intel
Icon for Regular Contributor rankRegular Contributor
5 years ago

HI,


You more or less are doing the right thing here and looking at the correct register.


Anyway, let's look at your issue together.

  • Typically 3 main setting that will affect the issue are speed, duplex mode and auto-negotiation
  • Pls check to ensure you set similar setting on both MAC, PHY and for both transmit device and receiving device
  • Having said so, on your customer board. Is there any external PHY chip between FPGA (TSE MAC + PHY) and your network switch device ? If yes, pls confirm the setting on the external PHY chip side


For TSE MAC and PHY setting (I have uploaded the relevant register setting screenshot)

  • on MAC side - command_config reg, eth_speed = 0
  • on PHY side - control reg read back, speed_selection = 10 ? Still stay at 1G, not 100Mbps ?
  • On PHY side - if mode reg
    • SGMII_ENA = 1
    • USE_SGMII_AN = 0
    • SGMII_SPEED = 01
    • SGMII_DUPLEX = 0 (assume you are using full duplex)

Thanks.


Regards,

dlim