Automatic signal delay compensation

NWare provides a way to automatically compensate the signal propagation delay through components in a project. This can be switched on using the Auto-compensate signal delays option on the project properties.

When you turn on delay compensation, delay alignment devices are added in front of every output, and in front of every multi-input device that combines the inputs. The compiler then places the devices on the DSP chips. Finally, based on the placement, the compiler sets the alignment delay lengths to whatever is necessary to achieve the equal arrival time of signals. Because this is done after the devices are placed, it is possible that when these delays are set the DSP memory will be over allocated. When this happens, there are several solutions:

• Increase the delay comp average size setting on the project properties (this setting provides a hint to the compiler about how much memory should be reserved for compensating for delays). This will reserve more memory, making the compile more likely to succeed.
• Reduce the Processing vector length, samples setting on the project properties. Less memory will be used, potentially reducing the entire system delay, but more DSP resources will be consumed. If your compile results show failure due to lack of memory, but you have spare DSP cycles, this solution may work.
• Hard assign some devices to DSP chips.