Does Nios II custom instruction need clk_enable?

I was not clear in explaining the situation, sorry... http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/sad.gif

I have a Nios II project with 3 custom instructions.

Each c.i. exports the signals to a single user logic, out of the Nios II core (but on the FPGA).

Each c.i. performs a different operation on this logic.

There is only one user logic, shared by the 3 custom instructions.

In the user logic, I used &#39;clock&#39; and &#39;reset&#39; from the top level entity of the project, not from each c.i.

Each c.i. is a fixed clock cycle operation and uses only &#39;start&#39;, &#39;dataa&#39; and &#39;result&#39;.

I didn&#39;t use &#39;clock&#39;, &#39;clk_en&#39; and &#39;reset&#39;.

For the moment, the project seems to work correctly.

The question is:

Is there the possibility that the Nios II core want to use the clk_en of each c.i. for some reasons?

In this case it&#39;ll not work!!?!! http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/blink.gif

Bye