Maximum frequency obtained when synthesizing the RI5CY core multiplier with 28 FD-SOI

[kgf]

STM28 FDSOI has many corners and flavors. It also depends a little bit on them. Unfortunately, NDAs would not allow me to comment on specific speed, but you are right the number is low from what you expect, it could be a lower power, lower leakage setup.

Also note that synthesis constraints can result in different implementations that exploit different trade-offs. Make sure your timing constraints and also putput loads are specified properly