QSF file set_parameter for time type generics

When I follow the steps, I get a different syntax:

set_parameter -name myparam 3 -to "ddr_out:xbar_outputs:0:xbar_clk_out"

The difference is that it has added the -to option with a value after it. This option tells Quartus what level of hierarchy to apply the parameter to. Note that gStrobeCycleTime could be a parameter in ten different hierarchies, all with different values and doing different things, which is why you need to tell Quartus where in the hierarchy it gets applies. Hope that helps. (And that's why I recommend right-clicking on the hierarchy you want in the hierarchy browser and locating to the assignment editor. It's tough to get the name right otherwise...)

And the reason it put quotes around your value is because it's a space, and in Tcl you need to put it in quotes to say that the full thing "10 us" is on value.