How to make NCO compiler use M9K blocks and not M144K

i think Quartus doesn't want to put a 64k deep RAM into M9K because it would need an 8:1 mux (8 M9K in 8k x 1b)

using M144K you can go 16k deep, so you only need a 4:1 mux (4 M144K in 16k x 18b/19b)

you can file an SR, at this point i think the issue is synthesis, not the actual NCO IP. i expect a significant fmax hit if you got the synthesizer to use M9K instead of M144K. what speed are you targeting? any way to trade fmax for latency?