Forum Discussion

Littlerice32's avatar
Littlerice32
Icon for New Contributor rankNew Contributor
5 years ago

How do I avoid using a specific LAB or ALM in Quartus Prime?

For example, I don't want to use a LAB named "LABCELL_X66_Y55_N6". How do I let Quartus Prime know this, and avoid using this LAB in compiling my design? Thank you.
SyafieqS's avatar
SyafieqS
Icon for Super Contributor rankSuper Contributor
5 years ago

Hi Sheng,


Any other concern on this?



  • Littlerice32's avatar
    Littlerice32
    Icon for New Contributor rankNew Contributor
    5 years ago

    Yes, the data path is within the same LAB cell, Quartus II still deliver a long routing path. (10x larger than other path)

    Is it a normal situation for a low-speed (32MHz) and low-utilization (27%) design?

    Could you give me some opinions for explaining why Quartus II did this?

    • sstrell's avatar
      sstrell
      Icon for Super Contributor rankSuper Contributor
      5 years ago

      Can you show the timing report details for the long path (including the routing and logic elements involved)? The HDL for that part of the design? RTL or Tech Map Viewer schematic?

      Do you have any relevant assignments in the Assignment Editor that might be forcing this?

      More info is needed to figure out what is going on here.