The Place and Route TRACE report contains a seciton titled "Clock Domains Analysis" which provides information on every clock domain in the design. This includes the clock net name, source, number of loads, and which clock domains transfer data into the domain. Below is an example of the section.
Clock Domains Analysis
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Found 8 clocks:
Clock Domain: pll_sdck Source: ehxplla_sdck/ehxplla_sdck_0_0.CLKOS Loads: 696
Covered under: FREQUENCY NET "pll_sdck" 150.000000 MHz ;
Clock Domain: pll_sdck2 Source: ehxplla_sdck/ehxplla_sdck_0_0.CLKOP Covered under: FREQUENCY NET "pll_sdck" 150.000000 MHz ; Transfers: 1
This report shows that there is 1 transfer from the pll_sdck2 clock domain to the pll_sdck domain. That transfer is covered under the listed FREQUENCY preference. The Clock Domains Analysis report will report on all clock nets even without a FREQUENCY preference. If the clock net is not covered by a FREQUENCY preference then the following message will be provided under the Clock Domain.
No transfer within this clock domain is found
Without a FREQUENCY preference TRACE will not analyze the clock domain so it cannot report on the transfers. Once a FREQUENCY preference is added for this clock domain then the transfers will be reported.