How to set entity for DSP_BLOCK_BALANCING

Hi,

I have some filters in my design and I would like one of them to use LEs only. So I found the DSP Block Balancing logic option but I'm not able to set this option to just one entity in my design. The line below is from my qsf file but it does not prevent the synthesis tool from implementing DSP elements for this filter.

set_instance_assignment -name DSP_BLOCK_BALANCING "LOGIC ELEMENTS" -to *iir_bandpass*

I tried this with/without some wildcards like iir_bandpass, iir_bandpass* or *iir_bandpass* but it is not working.

The only thing I got to work is preventing the usage of DSP blocks for the whole design with this option:

set_global_assignment -name dsp_block_balancing "logic elements"

But I would like to use LEs instead of DSP blocks in just one entity.

How can I do this?

Maik