Product block - options disable

[Altera_Forum]

Hi all 

 Anybody know how to enable the two options of the Product block in Altera DSP builder standard blockset: "Use Enable Port" and "Use Asynchronous Clear Port". In my version, they are disable by default.   I am using a licensed version of DSP builder.   Thanks

[Altera_Forum]

These options are disabled if there are 0 pipeline stages. Increase this number and those options should be modifiable.

[Altera_Forum]

Thank you, teacher. 

 I realize that the number of pipeline stages is corresponding to the number of delays between input and output signals. So what is the benefit of this parameter?

[Altera_Forum]

--- Quote Start ---  I realize that the number of pipeline stages is corresponding to the number of delays between input and output signals. So what is the benefit of this parameter?  --- Quote End ---    You can add more pipeline stages if you find this block on a failing path in the timing analyzer. Another reason to use it might be to add more delay to balance with another path, without you having to insert an explicit delay block.