FIR Compiler v8.0 interpolate by 2 FIR is broken

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Did you look at this document ?

http://www.altera.com/literature/rn/rn_ip.pdf

Chapter 9 page 61

There is a bug listed about incorret mcv simulation still present in Quartus V9

Did you contact MySupport ?

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Yes rn_ip.pdf was the document I was referring to in my previous post, and the MCV bug you mention is only for large interpolation factors. The bug I am experiencing occurs for both MCV and DA architectures, and I have an interpolation factor of 2 set.

I have contacted MySupport about this.