Article ID: 000079746 Content Type: Troubleshooting Last Reviewed: 09/11/2012

Are there any known issues with Stratix IV GX/GT device transceiver multi-PLL reconfiguration?

Environment

  • Stratix® IV GX FPGA
  • Stratix® IV GT FPGA
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Description

Yes. If you are using transceiver Multi-PLL reconfiguration feature to switch from/to the transmitter PLL outside the transceiver block, it does not reconfigure properly  if the “logic_tx_pll_sel” port is not enabled in ALTGX_RECONFIG MegaWizard™ Plug-In Manager.  This issue is associated with Stratix® IV GX/GT devices.

 

This issue is observed in both simulation and silicon. All Quartus® II software versions are affected by this issue.

 

The workaround is to enable “logic_tx_pll_sel” port in ALTGX_RECONFIG MegaWizard Plug-In Manager and use it during reconfiguration.

 

No Quartus II fix is planned. A message will be added in future Quartus II releases, reminding user to enable the “logic_tx_pll_sel” port in ALTGX_RECONFIG MegaWizard Plug-In Manager.

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