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[Design Compiler] Problem with area, timing and power while using ungroup option?

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gstekboy

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I coded 2 different MAC architecture in verilog and run in synopsys design compiler.
While compiling the design , I analysed the MAC architecture area, power and timing by checking and without checking ungroup option .


First MAC architecture
By using ungroup option in Design compiler , Area, power and timing(delay time) reports are less than that of grouped results.

Second MAC architecture
By using ungroup option in Design compiler , Area, power and timing(delay time) reports are more than that of grouped results.

Why these difference occurs?:bang::bang::bang:
 

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