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SFava's avatar
SFava
Icon for New Contributor rankNew Contributor
7 years ago

FIR II IP: issue with coefficient address width generation.

Hello, I am working with the FIR II IP core and set up the core to have two coefficient banks. The address space generated by qsys in contiguous and accommodates all required coefficients. In my p...
CheepinC_altera's avatar
CheepinC_altera
Icon for Regular Contributor rankRegular Contributor
7 years ago
Hi Samuele, Thanks for sharing the files and steps to replicate the issue. I have performed some tests on my sides and able to replicate your observation. As you mentioned, seems like when the number of coefficient is (2^x + 1), the number of address bit will be lacking of 1 bit. I have tested with Q18.1 and observe similar behavior. For your information, I have filed a case to Engineering to further look into this and for future fixes. To avoid gating your progress, as a workaround, I would like to recommend you to avoid using the number of coefficient = (2^x + 1). Sorry for the inconvenience. Please let me know if there is any concern. Thank you. Best regards, Chee Pin