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I used the following command for assigning global line from pin to PLL
set_instance_assignment -name GLOBAL_SIGNAL "GLOBAL CLOCK" -to "clocks:clocks|epll6_bb_a:a2d_clk_pll|altpll:altpll_component|_clk1"
What does '_clk1' specify in this.
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A PLL node name ending in ...|_clkn is a PLL output. It generally corresponds to the output labeled cn in the PLL MegaWizard (...|_clk1 is the same as c1). In some cases Quartus can switch around the PLL outputs, so the node name number might not always correspond to the number in the MegaWizard. I've rarely if ever seen a mismatch in the node name number and the MegaWizard number. If you want to be sure it doesn't happen, use "Preserve PLL Counter Order" in the Assignment Editor.
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