where is the information about modules in Qsys?

[Altera_Forum]

Hi all, 

 where can I find the documents about those components created in qsys? For example, every time you open qsys, there is a clk_0 module in listed as default, with four terminals as clk_in, clk_out, reset_in, reset_out.  But where is the information about this module of what it is? Is this reset high-active or low-active? when does reset_out is generated? something like this. RightClick--Details has a brief introduction, which tells nothing.  Thanks so much~~

[Altera_Forum]

Problem solved, maybe.... 

 This clk_0 seems to be a clk bridge module, or CLK and reset generation interface.  When working as bridge, it is used to drive multiple internal components using external clk and reset.  When working as clk and reset generation interface, from 'Show Signal Name' tab when adding this component, reset seems to be low-active.  Not 100% sure whether I am correct...  Really hate reading these datasheet with obscure statement~~

[Altera_Forum]

Every predefined component has a data sheet. In QSYS, open the parameters for the component and click the Details... button on the upper right. There is a link in that panel to the data sheet for the component. You can also get it from the IP Catalog by right clicking the component and choosing Details->Data Sheet.