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I thought I read that after reset the Transmitter sends 3 K28.5 code words automatically.
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That is quite possible, as I said, it depends on the protocol you are using. I use the ALTGX components in Basic mode and in PCIe mode, so I've never sent a K28.5 code word, which sounds like a 10GbE protocol. The transceivers have a lot of features ...
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"Yep. Depending on the ALTGX setup, you can access this signal manually"
What signal are you referring?
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The byte alignment signal. In basic mode, some of these signals are available for you to toggle.
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Is there a sample simulation available somewhere?
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You'll have to check for whatever protocol you are using. I've simulated the ALTGX in basic mode, and PCIe mode, and the simulations are completely different.
Cheers,
Dave