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Altera_Forum's avatar
Altera_Forum
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13 years ago

LE vs LUT vs Logic Gate. What is the relatioship/distinction between them?

I understand that the answer to this question may become quite lengthy. Thus my question is, where can I find the clear distinction made between Logic element, Look up table and Logic gate on FPGAs?

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  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    13 years ago

    LUT refers to a 4 inputs thruth table ( a SRAM with 16 rows ) inside the LE. The LE includes this truth table, a flip-flop D and additional logic. You always program the logic element. If you just need a combinational circuit you can by pass the FF-D.