Honored ContributorIs there a possible to change the JTAG Clock TCK over Quartus?
We program over JTAG and have in a chain a delay around a BIT. The problem could be solved with a slower CLOCK of the JTAG.
Honored ContributorI have same problem.
Honored ContributorWith USB Blaster, the JTAG clock is fixed to 6 MHz in the CPLD. It can't be programmed. You should be able to change it however by using a different clock oscillator.
Honored ContributorYou wrote.... You should be able to change it however by using a different clock oscillator.
Were can i change the oscillator?Honored ContributorThere's a 24 MHz clock oscillator inside the USB Blaster (3.3V, 5x7 mm SMD standard package, next to the CPLD). I assume, that replacing it with a lower frequency would help for the said problem. I didn't try the solution.
Honored ContributorI think this not a good idea. The 24MHz lookslike also the frequency for USB.
That tried somebody checked out?Honored ContributorHonored ContributorYou can use:
jtagconfig --setparam <cable number> JtagClock <frequency><unit prefix> i.e. with only 1 single USB blaster II plugged this will be: jtagconfig --setparam 1 JtagClock 6M This has been added in the USB Blaster II documentation. https://www.altera.com/en_us/pdfs/literature/ug/ug_usb_blstr_ii_cable.pdf#page=17Honored ContributorYes, USB Blaster II has a variable clock feature. The question was however about USB Blaster.
