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Altera_Forum
Honored Contributor I
733 Views

vector_add example - Not using DSP blocks

Hello Everyone, 

 

I am trying to analyze the resource usage of opencl "vector_add.cl" example.  

 

aoc -c vector_add.cl -report 

 

+--------------------------------------------------------------------+ 

; Estimated Resource Usage Summary ; 

+----------------------------------------+---------------------------+ 

; Resource + Usage ; 

+----------------------------------------+---------------------------+ 

; Logic utilization ; 17% ; 

; ALUTs ; 12% ; 

; Dedicated logic registers ; 7% ; 

; Memory blocks ; 12% ; 

; DSP blocks ; 0% ; 

+----------------------------------------+---------------------------; 

 

From this report, it is not using any of the DSP blocks available in FPGA. How to use DSP blocks? 

 

Thanks 

Pavan
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1 Reply
Altera_Forum
Honored Contributor I
29 Views

The DSP blocks on your FPGA do not support floating-point addition and hence, they cannot be used in the vector add example. Only the DSPs in Arria 10 and above support floating-point addition.

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