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Altera_Forum's avatar
Altera_Forum
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11 years ago

LPM_ADD_SUB result right-shifted on Arria V

I created an lpm_add_sub megafunction using Quartus 13.1 to add two 16-bit unsigned numbers. In ModelSim, everything works as expected. I put X"0001" on both inputs and get X"0002". However once I tr...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

THe LPM add sub is widely used and has been around for many years. I suspect it's more likely user error. Have you tried simulating your design?

can you post some code up for test.