Is there any documentation that can confirm the relationship between speed grade and transceiver performance for Stratix IV GX/GT devices?
If you search for the keyword Transceiver Performance Specifications from the Device Handbook at the URL link below, you will find the description in table format for your reference.
https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/hb/stratix-iv/stx4_siv54001.pdf
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