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PCI Express DCD

Question asked by on Oct 2, 2009

I'm just doing a PCI express Gen2 5Gb/s simulation (Channel simulation). I wanted to add TX DCD in the TX_DIFF component. when adding here 0.1 the result is a eye with a shifted Crossing point. Basically I would like to get a +- 0.5 variation to stay with a nice symmetric eye.
Am I wrong regarding the PCI-SPEC, or is there a way to get a symmetric eye with with the DCD settings in the TX_DIFF, or ...

thanks for any hints ..