Setting Slow Slew Rate Option in Quartus II

Hi All,

I am using CYCLONE III device - EP3C120F780C7 in my project.

Due to some requirements, I want to set the Slew Rate of some of the IOs to Slow Option (Cyclone III supports Slew Rate Integer values 0 to 2 as per documentation and so I want to set it to 0 or 1).

However when I set it to either 0 or 1 via the Assignment Editor, it gives me an error saying

Error: I/O standard 3.3-V LVCMOS on CS_SRAM3n I/O pin F12 cannot have Slew Rate logic option setting 1

Same is the case for setting it as 0 too.

I have set the defualt voltage in "Device and Pin Options" to 3.3V LVCMOS .

When I change it to 3.0V LVCMOS, it accepts 0 or 1 as Slew Rate Logic Option setting.

Are there any additional settings required? Or there exists a workaround for this?

Please reply at the earliest.

Thanks and Regards,

Saransh