Setup failed for altera_reserved_tdo

[Chris039]

The path below failed the setup timing. The sdc are from the template.

How to fix this setup violation? I am using Quartus Pro 22.3

[SyafieqS]

Hello Chris,

May I know what frequency you are running for TCK? 24MHz? You need to lower the tck clock rate of UBII. "Lower the tck clock rate of UBII." refers to change in the UBII hw. Then, update .sdc accordingly to confirm with STA. There are a few valid values. 24MHz, the default on UBII, is very hard to meet. 16MHz is more usable without really noticeable performance difference.  

The value change is not persistent. Need to reapply upon power cycle of UBII. The lowest UBII supported tck is 6MHz. In this case, you can set to 6Mhz and perhaps the violation is gone.

[Chris039]

I am just inserting the Jtag sdc from the template. Do I need to specially constrain the clock signal? Could you share the sdc that I need to add into the file?

[SyafieqS · Accepted solution]

Hello Chris,

In the jtag constraint look for 

proc set_tck_timing_spec { } {

  # USB Blaster 1 uses 6 MHz clock = 166.666 ns period

  set ub1_t_period 166.666

  # USB Blaster 2 uses 24 MHz clock = 41.666 ns period

  set ub2_default_t_period 41.666

  # USB Blaster 2 running at 16 MHz clock safe mode = 62.5 ns period

  set ub2_safe_t_period 62.5

In snipper above,you may comment 16MHz and 24Mhz, and 

set tck_t_period $ub2_default_t_period

change the $ub2_default_t_period --> ub1_t_period

[SyafieqS]

Hello,

May I know if there is any update from previous reply?

[Chris039]

I am still trying, I will update when I have the result

[Chris039]

The suggestion works. Thank you SyafieqS

[SyafieqS]

I’m glad that your question has been addressed, I now transition this thread to community support. If you have a new question, Please login to ‘https://supporttickets.intel.com’, view details of the desire request, and post a feed/response within the next 15 days to allow me to continue to support you. After 15 days, this thread will be transitioned to community support. The community users will be able to help you on your follow-up questions.

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