Intel Agilex Series

The reference clock is necessary to generate a pseudo-random data signal to prevent the transceiver from degrading over
time. You must instantiate at least one dummy channel in the E-tile using the Native PHY IP GUI. Provide this channel at least
one reference clock. All preserved channels in a single E-tile can use the same reference clock.
When your design uses some channels in an E-tile, you can use the per-pin PRESERVE_UNUSED_XCVR_CHANNEL QSF
assignment to preserve only the channels in the E-tile that you intend to use. If you never intend to use a channel, you
should not add the per-pin PRESERVE_UNUSED_XCVR_CHANNEL QSF assignment.
Here are some examples of PRESERVE_UNUSED_XCVR_CHANNEL QSF assignments.
#Global QSF assignment
set_global_assignment -name PRESERVE_UNUSED_XCVR_CHANNEL ON
#Per-pin QSF assignment
set_instance_assignment -name PRESERVE_UNUSED_XCVR_CHANNEL ON -to AA75
Related Information
Unused Transceiver Channels
For more detailed information about preserving unused transceiver channels in E-tile devices.
7.8. Understanding and Troubleshooting Configuration Pin Behavior
Configuration typically fails for one of the following reasons:
• The host times outs
• A configuration data error occurs
• An external event interrupts configuration
• An internal error occurs
7. Intel Agilex Debugging Guide
683673 | 2021.10.29
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