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problem wih jtag_uart in Nios when use SSRAM

Altera_Forum
Honored Contributor II
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Hello, 

I have created the project Nios + TSE + PIO + RS-232 + pll + jtag_uart + SSRAM. Reset vector and exception vector in SSRAM. Through the jtag_uart the Nios sends the statistical information in console IDE8.0. In 20-30 minutes of job the jtag_uart ceases to work.  

In the console come the message nios2-terminal: exiting due to I/O error communicating with target. However project with Nios + SSRAM continues to work. It is visible on tests leds. If instead of jtag_uart to use RS-232 for sends the statistical information, that in the terminal visible, what Nios + SSRAM to work.  

If instead of SSRAM to use onchip_ram, there are no problem, jtag_uart works during long time, nios2-terminal doesn't give out error. 

In both cases of board identical. 

Why the nios2-terminal of IDE ceases to work when in the project there is SSRAM? 

I am use Q8.0 

 

Thanks.
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Altera_Forum
Honored Contributor II
450 Views

most likely there is something wrong with your byte enables.

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Altera_Forum
Honored Contributor II
450 Views

 

--- Quote Start ---  

most likely there is something wrong with your byte enables. 

--- Quote End ---  

 

 

Dwesterg, Thanks to you for advice. 

I have checked up pin connection Nios interface to SSRAM pins, with byte enable there are no mistakes.  

In my first poct I wrote, that If instead of jtag_uart to use RS-232 for sends the statistical information, that in the terminal visible, what Nios + SSRAM to work. From this I draw a conclusion that SSRAM memory is connected to the Nios correctly.
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Altera_Forum
Honored Contributor II
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Hello, 

 

I am responding to very old thread but I think this may be useful to somebody as we also faced same issue. 

 

It looks noise as one possible reason for this. You may like to check is there anything which could create noise on JTAG related lines. It might also be worth to have a look at https://www.altera.com/support/support-resources/knowledge-base/solutions/rd06292006_529.html 

(https://www.altera.com/support/support-resources/knowledge-base/solutions/rd06292006_529.html

Similar threads which may also be helpful: 

https://www.alteraforum.com/forum/showthread.php?t=27179 

http://alterauserforums.com/forum/showthread.php?t=14747 

 

Regards, 

Bhaumik
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