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KrishnamRaju's avatar
KrishnamRaju
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2 years ago
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MAXII to MAX5 CPLD foot print compatability

Dear Team We are chaning MAX CPLD II EPM2210F256C5N with MAX V CPLD 5M2210ZF256I5N . 1. Are both CLPDs foot print compatiable? 2. In my old design for MAXII VCCINT 3.3V is there and Now I am chang...
Programmable Logic Device
  • FvM's avatar
    FvM
    2 years ago

    Hi,
    It's all described in device handbook and datasheet.

    GPIO have weak pull-up resistors to respective VCCIO until user mode becomes active. State of unused pins can be globally selected in Quartus device and pin options.

    "Reserves all unused pins on the target device in one of 5 states: as inputs that are tri-stated, as outputs that drive ground, as outputs that drive an unspecified signal, as input tri-stated with bus-hold, or as input tri-stated with weak pull-up."

    Personally, I won't choose high-Z without pull-up if there are any unconnected GPIO pins because floating inputs can involve additional device current consumption.

    Regards
    Frank

FvM's avatar
FvM
Icon for Super Contributor rankSuper Contributor
2 years ago
@KrishnamRaju wrote:

I found only T6 as the difference which was used as GPIO in my design. This GPIO is not crucial for my design. Can I gohead with testing?


Hi,
good if you can get along without usingT6 as GPIO. Preferably you'll connect the pin to ground, but I guess MAX V will work even if you leave it floating.

Regards
Frank