Created a new ALTLVDS_RX in MegaWizard Plug-In Manager of Quartus II Ver.10.0. After that, to change the parameters, start the MegaWizard Plug-In Manager in edit mode again and select the existing ALTLVDS_RX, but the parameters cannot be selected (input) and cannot be edited.
This phenomenon occurs only in Quartus II Ver.10.0.
This bug has been fixed in Ver.10.0 Service Pack 1 or later.
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