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Altera_Forum's avatar
Altera_Forum
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10 years ago

Optimal ALU

Dear all, I'm creating an ALU for a homemade NIOS II compatible processor with Quartus Prime, targeting the Cyclone V. I discovered that, depending on the operations ordering, the ALU has a differ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

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Unordered!

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Then this does not make sense to me. If indeed your implementation is written as 'unordered' (as my example shows above) then the exact encoding of which operation is selected by code 0,1,2,3 should make no difference, as the LAB logic can select any of the bit patterns equally easily.

So you need to provide a lot more detail on what you are implementing (example code of yours) and what the fitting results are, as what you have reported so far is too general.