Intel: The Native PHY setting items for Arria® 10 GX include Common PMA Options ⇒ Transceiver Link Type: SR or LR, but what should I use as a basis for selecting the settings?

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Intel: Arria® 10 GX Native PHY setting items include Common PMA Options ⇒ Transceiver Link Type: SR or LR.

Arria

Category: Transceiver
Tools: Quartus® Prime
Device: Arria® 10

This parameter depends on the characteristics of the transmission line, and SR should be selected when IL (Insertion Loss) is 10dB or less.
This setting is mainly used for Chip to Chip communication.
Select LR for Backplane communications where IL exceeds 10dB.

Reference information
Intel® Arria® 10 Transceiver PHY User Guide
https://www.intel.com/content/dam/altera-www/global/en_US/pdfs/literature/hb/arria-10/ug_arria10_xcvr_phy.pdf
(See XCVR_A10_TX_LINK in Transmitter General Analog Settings.)

Note that the tool assigns SR by default.

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