An Intel® Stratix® 10 E-Tile Native PHY IP core has two main receiver adaptation modes. Initial adaptation is used to calibrate the PMA to known good settings. For more information on its usage model, please refer to the E-Tile Transceiver PHY User Guide.
Initial adaptation can be run with 3 different effort levels which impact the time needed to complete:
1. Low Effort (00_effort) – used for NRZ Ethernet AN/LT and CPRI protocols only and quickest to complete.
2. Medium Effort (05_effort) – used for PAM4 Ethernet AN/LT only to meet IEEE link up time of 3s.
3. Full Effort (10_effort) – general usage (NRZ and PAM4) that provides best performance and stability, takes the most time to complete – most recommended calibration mode.
Register 0x200, Bits [1:0], can be set to pick the effort level:
[1:0] = 0 – 00_effort
[1:0] = 1 – 05_effort
[1:0] = 2 – 10_effort
Here are example register writes for using initial adaptation, internal or serial loopback, PRBS31, and running full effort initial adaptation:
The emboldened "2" above can be changed to either a 1 (for medium effort) or a 0 (for low effort) initial adaptation.