Forum Discussion

NZhan1's avatar
NZhan1
Icon for Occasional Contributor rankOccasional Contributor
6 years ago

Can we constrain Cyclone 4 FIFO to use MLAB instead of M9K?

Quartus II 12.1 (64-bit). FIFO IP can only set the memory block type to Auto or M9K. When we choose Auto, it will still use M9K. How to constrain Cyclone 4 FIFO to use MLAB only? Thanks!
KennyT_altera's avatar
KennyT_altera
Icon for Super Contributor rankSuper Contributor
6 years ago

If the IP does not allow you to select MLAB, which means the IP does not support it. It might be due to

1) performance issue using the fifo on Mlab.

2) the device itself does not have Mlab.

However, check on the latest version of Quartus to see if they are any changes.

  • NZhan1's avatar
    NZhan1
    Icon for Occasional Contributor rankOccasional Contributor
    6 years ago

    Hi Kenny

    ​

    can I use qsf to constrain it ? such as "set_parameter -name ram_block_type MLAB -to <entity>" or "set_global_assignment -name BLOCK_RAM_TO_MLAB_CELL_CONVERSION <value>". Can I use Logic Cell to realize FIFOs?