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DRIVE strength and SLEW rate in Alchitry Labs - Printable Version

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DRIVE strength and SLEW rate in Alchitry Labs - Rory - 03-21-2021

Hi,
With the Mojo v3 in the old IDE, you could adjust the pin IO standard, pullup/down resistors, slew rate, and drive strength in the .ucf file as shown here.

In Alchitry Labs, you edit a .acf file, but the only allowed keyword is "pullup" or "pulldown". How do I change the DRIVE strength parameter in Alchitry Labs? 
The relevant Xilinx 7-series SelectIO document is here on page 48.

Thanks.