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EGrub's avatar
EGrub
Icon for Occasional Contributor rankOccasional Contributor
7 years ago

BUG - Fir filter coefficient read mode

Hi all! For writing/reading coefficients I made a wrapper to compute the proper reset before accessing the Avalon slave. Writing seems to work fine but reading has issues Considering the FIR II IP...
EGrub's avatar
EGrub
Icon for Occasional Contributor rankOccasional Contributor
7 years ago

Hi Chee Pin!

Really? Do I really need to explain it?

  • First what you described here: https://forums.intel.com/s/question/0D70P000006INUJSA4
    • Valid is always high!!!!!!!
    • Read request is not necessary! Why is there then a read request signal?????????????????????????
    • Data changes one clock cycle after, the manual states 3!!!!!!!
  • Reset signal seem not to be necessary for read
    • The waveforms for reading in the manual shows a reset upfront!!!!!!!!!!
  • Behavior between Quartus 15.1 and Quartus 17.1 is different but manual does not show any difference!
  • Maybe even Quartus 18.1 behavior is different but there is no new document for that!

Best regards,

Erich