Device Family: Arria® V GT, Arria® V GX, Arria® V ST, Arria® V SX

Type: Answers

Area: Component, HSIO

Why doesn't the Reverse Serial Loopback (RSL) feature work on Arria V GX devices in Quartus II Software versions 12.1sp1 and earlier?


The Reverse Serial Loopback (RSL) feature does not work on Arria® V GX devices due to a bug in the Quartus® II Software versions 12.1sp1 and earlier.

  • For RSL Pre-CDR, The Tx signal will be steady state.
  • For RSL Post-CDR, The Tx signal will exhibit high jitter.


This issue will be fixed in a future version of the Quartus II software.