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HI, according to the Cyclone IV GX reference manual (p.38 under HSMC subtitle), it says "The HSMC port A interface has programmable bi-directional I/O pins that can be used as 2.5-V LVCMOS, which is 3.3-V LVTTL-compatible."
With that, is 3.3V permitted as input signal for HSMC Port A?
Or only max up to 2.5V is accepted?
If I supply 3.3V as input signal voltage to HSMC Port A, is there the possibility that it causes the MAXII to burn?
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I'm not sure about the CIV board but the CIII started board has 2.5V IO with no protection on the inputs so I'd wouldn't expect the inputs to reliably work / survive with 3.3V.
If the Max device can see the HSMC pins it might be that it's got 2.5V IO and can't withstand 3.3V.
Nial.
Honored Contributor
