NIOSII RST pin

[Altera_Forum]

Dear guys, 

 I would like to implement a reset of NIOS II processor by software. So I have included by SOPC builder a simple output PIO which is directly connected to the processor RST pin.  When I drive this PIO with a LOW state of 20 us (and I'm sure I drive it because I can  show it on a scope) I expect NIOS II makes a reset. But it doesn't happen !!!   Any ideas ?  Best Regards  /Alessandro Strazzero

[Altera_Forum]

If you just want a software reset then 

 1. disable all IRQs (if you use any)  2. use  goto *((void**) NIOS2_RESET_ADDR);  to jump to the reset address of the NIOS.  NIOS2_RESET_ADDR is defined at system.h, so don&#39;t forget to  # include <system.h>  This will ONLY reset the CPU, NO reset for any of the peripherals !!  Hope this helps,  Klaus

[Altera_Forum]

How can I reset my processor from inside the VHDL code without it resetting all peripherals ? 

 I have a top entity VHDL which has an instance of the Nios II system (which was generated by SOPC builder), connected to various custom VHDL modules. I want the VHDL to supervise processor operation and restart it in case anything goes wrong. How can this be achieved ?

[Altera_Forum]

--- Quote Start ---  originally posted by eliben@Sep 6 2006, 06:05 AM how can i reset my processor from inside the vhdl code without it resetting all peripherals ?  i have a top entity vhdl which has an instance of the nios ii system (which was generated by sopc builder), connected to various custom vhdl modules. i want the vhdl to supervise processor operation and restart it in case anything goes wrong. how can this be achieved ? <div align='right'><{post_snapback}> (index.php?act=findpost&pid=18094)  --- quote end ---    --- Quote End ---     I think Nios V6.0 provides a separate CPU reset signal...

[Altera_Forum]

--- Quote Start ---  originally posted by stonie+sep 6 2006, 04:35 am--><div class='quotetop'>quote (stonie @ sep 6 2006, 04:35 am)</div>  --- quote start ---  <!--quotebegin-eliben@Sep 6 2006, 06:05 AM how can i reset my processor from inside the vhdl code without it resetting all peripherals ?  i have a top entity vhdl which has an instance of the nios ii system (which was generated by sopc builder), connected to various custom vhdl modules. i want the vhdl to supervise processor operation and restart it in case anything goes wrong. how can this be achieved ? <div align='right'><{post_snapback}> (index.php?act=findpost&pid=18094)  --- quote end ---    --- Quote End ---     I think Nios V6.0 provides a separate CPU reset signal... <div align='right'><{post_snapback}> (index.php?act=findpost&pid=18102)</div> [/b]  --- Quote End ---    Thanks. Is there a way, however, to do it in Nios 5 ? It doesn&#39;t have to be an "officially supported way".

[Altera_Forum]

Hi Eliben, 

  We have applications that sometimes need to restart the CPU. Stonie&#39;s method of killing the IRQs and jumping to the reset address works ok for us on version 5.0 but I would like to add a little to what he says. As well as disabling the global IRQ it is best to disable all the individual IRQs on the peripherals too. I think Stonie meant this but didn&#39;t make it quite clear. This ensures that when the system wakes up again there are no &#39;pending&#39; interrupts that get serviced before you&#39;re ready for them, or have even installed them.  Banx.