Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
18 years ago

Determining path for cell in netlist

Hi, I'm trying to apply a generated clock to a clock net burried in the hieracrchy, like so: create_generated_clock -name {oven_ctl_i2c_clk} -divide_by 1024 -source [get_ports {osc_clk0}] ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
18 years ago

The port osc_CLK0 drives a PLL, which has a generated clock/s coming out of it, and you're using one of those clocks to generate another clock. So your -source should not be the port, but the ouptut of the PLL. In TimeQuest, double-click on Report Clocks and find the PLL output that drives this one. Use that Target name as the -source of this generated clock. (I filed an SR that I thought this Info message should be a Warning, as it's more serious than just Info...)