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BrendenB's avatar
BrendenB
Icon for New Contributor rankNew Contributor
2 years ago
Solved

Does CURRENT_STRENGTH_NEW limit current?

Is the output current from a pin limited when CURRENT_STRENGTH_NEW is set? For example, if I set CURRENT_STRENGTH_NEW to 10mA will the pin only allow 10mA out? If not, is there any pin setting that m...
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  • FvM's avatar
    FvM
    1 year ago

    Hi,
    current strength specification has nothing to do with limiting output current to a certain value. The mA value defines the maximum load current that keeps output voltage drop within the logic level specification of a certain IO standard. Maximal output current, e.g. into shorted output is much higher and exceeds in most cases FPGA maximum rating so that the output driver may be damaged.

    See for example the output characteristic of Cyclone 10 LP CMOS 3V IO standard with 4 mA current strength according to IBIS files.

    The only IO standard that limits output current to a safe value is LVDS 2.5 V. HSMC breakout adapter is obviously designed to use this standard.

AqidAyman_Altera's avatar
AqidAyman_Altera
Icon for Regular Contributor rankRegular Contributor
1 year ago

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