Forum Discussion

RTutu's avatar
RTutu
Icon for New Contributor rankNew Contributor
7 years ago

Map multipliers to DSP blocks using Quartus 18.0

Hi, I want to map multipliers to the Arria 10 DSP blocks using Quartus 18.0 Pro. I'm using the following code from the template: module teste #(parameter WIDTH=18) ( input clk, input sig...
CheepinC_altera's avatar
CheepinC_altera
Icon for Regular Contributor rankRegular Contributor
7 years ago

Hi,

As I checked with the Q18.0Pro Help, it seems to say the following:

"

CAUSE: A DSP block output port with multiple fan-outs prevented some registers from being packed inside the DSP block.

ACTION: Please refer to "Fixed Point DSP Register Packing Details" table in the Fitter Report to determine which DSP blocks were affected. Ensure DSP block outputs that require register packing have only one fan-out.

"

Can you help to check if the fan-out restriction apply to your design? Here, it seems to say the output can only have one fan-out. If after modifying your design to have one fan-out and it can pass the compilation, this might be relate to new restriction in Q18.0Pro on register packing.

Thank you.

​