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Yeah, that's a weird combo, and assume anything this domain needs to be related to is out of the PLL. If I remember correctly, your Tco is still your delay from the input pin to/through the PLL, minus it's delay compensation, plus the global, through the register and out the pin. The compensation and global should be pretty close to canceling out.
Again, since your Tco's don't really make sense in relation to your input clock, that delay will just cancel out for everything you do.
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I have multiple chips in my system that all create this 260Mhz clock to transfer data between them. So I need to be able to check the timing between them, but there doesn't seem to be anything that will do this.
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