Changes

[[#REQ1|REQ1]] through [[#REQ4|REQ4]] specify in detail a generic requirement of ''non-intrusiveness''. In other words, it is required that the implementation of link monitoring function is virtually transparent to the other parts of the system. As a consequence

*<u>the cost of additional PL resources is neglectable</u> with respect to the Microblaze-based approach described in <ref name="XAPP743"></ref>

*<u>physical link is not affected at all</u>: normal operating, while monitoring is continuously in progress, is guaranteed by the integrated circuitry of GTP/GTX transceivers<ref name="UG482">''UG482 7 Series FPGAs GTP Transceivers User Guide'', http://www.xilinx.com/support/documentation/user_guides/ug482_7Series_GTP_Transceivers.pdf</ref><ref name="UG476">''UG476 7 Series FPGAs GTX/GTH Transceivers User Guide'', http://www.xilinx.com/support/documentation/user_guides/ug476_7Series_Transceivers.pdf</ref>.