set_global_assignment -name QIP_FILE           rtl/pll.qip
set_global_assignment -name QIP_FILE           [file join $::quartus(qip_path) pll_hdmi.qip ]
set_global_assignment -name QIP_FILE           [file join $::quartus(qip_path) pll_audio.qip ]
set_global_assignment -name QIP_FILE           [file join $::quartus(qip_path) pll_cfg.qip ]