Problems with altera_reserved_tck

Time constraints applied to altera_reserved_tck haven't helped me to fix this problem.

In my case the problem solution was quite simple. After to added a constraint to NIOS clock signal, all my jtag errors (related with clock altera_reserved_tck) disappeared.

Eg

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# Clock constraints

create_clock -name "MCLOCK" -period 20ns [get_ports {NIOS_CLK}] -waveform {0.000ns 10.000ns}# Automatically calculate clock uncertainty to jitter and other effects.

derive_clock_uncertainty

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where NIOS_CLK is the pin name related with oscillator input.

BR,