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prevent auto-inferrence of specific mult-accum?

Altera_Forum
Honored Contributor II
‎08-23-2012 03:06 AM
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Hi - does anyone know how to keep Quartus from inferring a mult-accum? I know you can turn it off for the entire design, and I know you can turn it off for a MULT with the multstyle parameter. But I can't seem to keep it from using a hard DSP block for a mult-accum it inferred from logic. 

 

Thanks! 

/j
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Altera_Forum
Honored Contributor II
‎08-23-2012 06:55 AM
738 Views

Multstyle synthesis attributes can be also used on design entities (an architecture). In so far you have a means to control DSP inference for part of your design. There may be also indirect ways by "keeping" specific design nodes. 

 

What's the actual problem behind your question?
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Altera_Forum
Honored Contributor II
‎08-23-2012 09:35 PM
738 Views

The actual problem is that I need to prevent auto-inferrence of a specific mult-accum. Found the answer here... 

 

 

http://quartushelp.altera.com/11.1/mergedprojects/hdl/vhdl/vhdl_file_dir_attribute.htm
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