Why do I see invalid read data when the DSP Builder memory interface bus has an NCO or FIR attached?

Description

You may see invalid read data at the end of a memory read burst or at the end of any single memory read if you have an NCO or FIR component on your DSP Builder memory interface bus.

Resolution

This is due to a problem with the Quartus® II software.

The workaround is to move the NCO or FIR filter to a non-zero address.

This is scheduled to be fixed in a future release of the Quartus® II software.