how to create nios ii component?

if your component uses a common processor bus, you can connect it to the Avalon bus (not really a bus, but more like a net)

Sopc builder documentation

http://www.altera.com/literature/quartus2/lit-qts-sopc.jsp (http://www.altera.com/literature/quartus2/lit-qts-sopc.jsp)

component creation documentation

http://www.altera.com/literature/hb/qts/qts_qii54007.pdf (http://www.altera.com/literature/hb/qts/qts_qii54007.pdf)

there is a video of component creation on this page

http://www.altera.com/education/demonstrat...sign-flows.html (http://www.altera.com/education/demonstrations/online/design-software/flows/onl-design-flows.html)

to better understan what you are doing read the avalon specification

http://www.altera.com/literature/manual/mnl_avalon_spec.pdf (http://www.altera.com/literature/manual/mnl_avalon_spec.pdf)

and other documents on Nios

http://www.altera.com/literature/lit-nio2.jsp (http://www.altera.com/literature/lit-nio2.jsp)

Iztok Jeras