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db12321

ARTY XDC Drive strength

Question

I am using an ARTY board. I have just used the constraints as is without making any changes. I do not see any constraints for drive strength or Slew rate attribute anywhere in the XDC file. I am wondering how it is determined that the default values are sufficient for these attributes. For example for the Ethernet PHY i browsed thru the datasheet but didnt see anything that would make it clear to select 12mA (default) drive strength for those pins.

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Hi @db12321,

I believe with the phy (here) having the RMII and MII standard interface dictates the signal specs in in this case follow the IOSTANDARD LVCMOS33 for the fpga constraint. I will reach out to a more experienced engineer on Tuesday to confirm and or get more input into your question. I do know that the settings for the ethernet in the XDC works for the arty. Here is a working project done by @hamster using the arty board.

cheers,

Jon

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