Error (14704): The following DSP blocks form a DSP chain of length 32. Maximum allowed DSP chain length is xxx

You may receive above error message for your FIR II Megacore ® design when the DSP chain is longer than it allowed.

Here is the workaround for this issue:

1. Access to the device.xml file that located at "Installation path"\14.1\quartus\dspba\backend\windows64\devices or "Installation path"\14.1\quartus\dspba\backend\devices

2. Look for this line “<max-dspb-block-chain-length>32<\max-dspb-block-chain-length>” at the section of the device that you used, for example Arria V

3. Edit this line to reduce the maximum number of DSP chain, for example, change it to 16 instead of 32.

This problem is not scheduled to be fixed in a future release of the Intel® Quartus® Prime Standard Edition software.