nios II implementation problem

> what's the use of on-chip ROM.

There's no write enable ... so it won't get corrupted by code

that doesn't play nice. Basically, it's useful for code/data that

must remain consistent when a device (re)configuration does not

occur (e.g. software reset/watchdog reset) ... otherwise, there's

little motivation to use on-chip ROM over on-chip RAM.

> because whenever we there is a power off, data will vanish!

Well ... this is really depends on your point-of-view I guess ... but

once the Cyclone/Stratix device is configured the on-chip ROM is

available ... if the device isn't configured ... then it really doesn't

matter ;-)

Regards,

--Scott