Can I mix multipliers of different widths in the same Stratix™ digital signal processing (DSP) block?

Description

Yes. You can place multipliers with an input width greater than 9 bits and less than or equal to 18 bits together in a DSP block, as the block will operate in 18×18 mode. You can also place multipliers with an input width less than or equal to 9 bits together in a DSP block, where the block operates in 9×9 mode. For example, a 16×16 and 18×18 multiplier can share the same DSP block as well as a 4×4 and an 8×8 multiplier.

Since a DSP block can operate in only one mode at a time, it is not be possible to have both types of multipliers in the same DSP block. You can convert a smaller multiplier (less than or equal to 9 bits) to be implemented in an 18×18 mode by extending the input width to at least 10 bits.