Honored Contributor
Honored ContributorThank you for your prompt.
The constraining on resrt_n is working,all unconstrained paths has beed cut. But the critical warning cause by JTAG still exist. 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 down the DDR2 clock to 133.333MHz,the NIOS clock down to 66.667MHz,but the slack value still negative. The constrainning code: derive_pll_clocks -create_base_clocks set_clock_groups -asynchronous -group [get_clocks altera_reserved_tck] set_input_delay -clock altera_reserved_tck -clock_fall 1 [get_ports altera_reserved_tdi] set_input_delay -clock altera_reserved_tck -clock_fall 1 [get_ports altera_reserved_tms] set_output_delay -clock altera_reserved_tck -clock_fall 1 [get_ports altera_reserved_tdo]
