How to constrain the JTAG in SOPC Builder

[Altera_Forum]

Hello everyone: 

 I have a DK-DSP-3C120N kit.Recently,I'm struggling with the DDR2 HP Controller under the direction of AN517(Using High-Performance DDR, DDR2, and DDR3 SDRAM With SOPC Builder).The design is targeted to the Cyclone® III EP3C120F780C7 Kit.   In this example,the SOPC system contain a Half-Rate DDR2 Controller working at 150MHz(altmemddr_auxfull),the PLL of the controller simultaneously generate a 75MHz output clock(altmemddr_sysclk) which been used as SOPC system clock.   After compilation,I got three critical warning,cause by JTAG.The TimeQuest report negative slack(-2.435) in Summary(Removal) of altera_reserved_tck. The Top Failing Paths (Removal:altera_reserved_tck) is this: Slack:-2.435 From---altera_reserved_tck  To-----pzdyqx:nabboc|pzdyqx_impl:zdyqx_impl_inst|FNUJ6967   I've tried to slow the DDR2 clock down to 133.333MHz,the NIOS clock down to 66.667MHz,but the slack value still negative.   I lose my head of this because I've constrained the JTAG using the templet:# JTAG Signal Constraints constrain the TCK port create_clock -name tck -period 100.000 [get_ports altera_reserved_tck]# Cut all paths to and from tck set_clock_groups -asynchronous -group [get_clocks altera_reserved_tck]# Constrain the TDI port set_input_delay -clock altera_reserved_tck -clock_fall 1 [get_ports altera_reserved_tdi]# Constrain the TMS port set_input_delay -clock altera_reserved_tck -clock_fall 1 [get_ports altera_reserved_tms]# Constrain the TDO port set_output_delay -clock altera_reserved_tck -clock_fall 1 [get_ports altera_reserved_tdo]   I didn't know what's wrong with it. Can anybody help me? Thank you very much!

[Altera_Forum]

The error is not related to your DDR2 or NIOS clocks. You are obviously using an IP core in OpenCore Plus evaluation mode (because you don't have a license for it). All that is happening is there is a path failing on the JTAG clock domain with regards to the OpenCore evaluation mode. 

 I would just ignore the error and move on with life.  Jake

[Altera_Forum]

Thank your guidance! 

T'll ignore this and go on.