Forum Discussion
Zarquin
Occasional Contributor
Occasional ContributorCan a 1000mbps RGMII TSE communicate with a 100mbps PC?
Dear community, is it possible to establish an Ethernet connection from Cyclone V Dev Kit to my 100Mbps LAN PC? And if so, what configuration is necessary? On the FPGA, a Triple Speed Ethernet IP M...
- Hi,
RGMII reference clocks and data rate changes with ethernet speed and has to switched in MAC. Reading negotiated speed through MI is the usual way to handle it.
ZarquinOccasional Contributor
Occasional ContributorHi FvM,
thank you very much for the answer.
Do I have to adjust the tx_clock to the autonegotiated speed in the PHY?
More precisely: Do I have to query the speed from the corresponding Marvell PHY register and adjust the tx_clock frequency generated by the FPGA to the actual speed? Or can the tx_clock continue to operate at 125MHz ?
FvM
Super Contributor
Super ContributorHi,
yes, RGMII reference clocks and data rate change according to 10/100/1000 ethernet speed.
yes, RGMII reference clocks and data rate change according to 10/100/1000 ethernet speed.
