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Explorer
Explorer
7,143 Views
Registered: ‎09-28-2012

What equivalent attribute in Xilinx IDE

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Hi,

I see an example on Xilinx FPGA with tool Synplify-Pro:

attribute syn_multstyle : string;
attribute syn_multstyle of MULT : signal is "logic";


I only have Xilinx IDE. How can I get the above constraint in IDE?
I am working on Xilinx Spartan-6. I know DSP48 in Xilinx, but I need to know using logic to get mulitiplication. IDE Xilinx synthesiser can get it done automatically without manually explore the mulitiplier?

Thanks,
 
 
 
 
 
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Instructor
Instructor
13,950 Views
Registered: ‎08-14-2007

Re: What equivalent attribute in Xilinx IDE

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Check out MULT_STYLE in the XST manual.  I believe the setting you want is either "lut" or "pipe_lut" depending on whether or not you want to use pipelining in the slice-based multiplier implementation.  If you need pipelining, your source code should supply the required number of pipeline registers before or after the multiplier in order to allow the pipelining to match the requested RTL behavior.

-- Gabor
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Highlighted
Instructor
Instructor
13,951 Views
Registered: ‎08-14-2007

Re: What equivalent attribute in Xilinx IDE

Jump to solution

Check out MULT_STYLE in the XST manual.  I believe the setting you want is either "lut" or "pipe_lut" depending on whether or not you want to use pipelining in the slice-based multiplier implementation.  If you need pipelining, your source code should supply the required number of pipeline registers before or after the multiplier in order to allow the pipelining to match the requested RTL behavior.

-- Gabor
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