Constraining PLL in TimeQuest

Hi wat_arg,

By default, the PLL clock name is the same as the output pin name. However, in Classic Timing Analyzer, the PLL clock name is the same as the net name. By specifying -use_tan_name option to derive_pll_clocks, you can use the net name as the PLL clock name.

For example, when the instance name of the ALTPLL is inst, the c0 clock is set as follows:

without -use_tan_name: inst|altpll_component|auto_generated|pll1|clk[0]

with -use_tan_name: pll:inst|altpll:altpll_component|pll_altpll:auto_generated|wire_pll1_clk[0]