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sanjay.patil
Visitor
Visitor
1,833 Views
Registered: ‎02-09-2012

DSP Slice utilization in Spartan-6

I've one video module implemented on
Target Device:
xc6slx150-3csg484

1. module shows
(PAR Report)
Number of DSP48A1s
137 (used)
180(available)
2. If I instantiate the video module along with other modules in my top level integration, I expect DSP slice count utilization to increase, However it actually decrease the DSP slice count utilization to

Number of DSP48A1s
89
180
49%

Any reason? I made sure that I'm driving the input to the module and it is not hanging.

Thanks
Sanjay
76%

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austin
Scholar
Scholar
1,809 Views
Registered: ‎02-27-2008

s,


Check your constraints.  Use of the DSP48 blocks is not necessarily required, the synthesis tool may choose to use the fabric (CLB's LUT's DFF's).


Also check the starategies in synthesis.

 

 

Austin Lesea
Principal Engineer
Xilinx San Jose
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