Occasional Contributor
Regular ContributorHi,
As I understand it, you have some inquiries related to CTLE. For your information, generally I would use adaptive CTLE first during PMA tuning because it is automated and adapts itself based on a specific setup and environment. However, sometimes, adaptive CTLE might not be enough to give you the required BER. In these cases, we will need to perform further fine tuning through manual CTLE by using the adapted values as baseline to start with.
Please let me know if there is any concern. Thank you.
Best regards,
Chee Pin
Occasional ContributorHi,
I am running my transceiver at 5 Gbps data rate. I use transceiver training toolkit for transceiver tuning. I got the best values for TX PMA after running autosweep. I set these values in qsf and tested again. Even though initially BER is zero,when I run transceiver link BER is toggling very frequently without settling to a value.I ran autosweep again I got different values for Premphasis taps that are close to previous values.
I expect once the best values from autosweep is kept in qsf settings, BER will settle to 0 consistently.But this is not happening!!
In my experiment I have kept VOD constant at 31 as Stratix 10 user guide suggests VOD to be between 17-31.But when I run autosweep with complete range of VOD,I get the best value as 12.
For lower values of VOD in the range of 17-20 Fitter throws follwing error :
Error(15744): The settings must match one or more of these conditions:
Error(15744): ( tx_powerdown == POWER_DOWN_TX ) OR ( compensation_en == DISABLE ) OR ( vod_output_swing_ctrl inside {[0:16],[18:31]} ) OR ( powermode_ac_tx_vod_w_jitcomp == TX_VOD_W_JITCOMP_AC_L17 )
