I have assigned pins for True-LVDS Tx or Rx to a bank that supports True-LVDS, but sometimes an error occurs in the Fitter. Why is this happening?

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I have a True-LVDS Tx or Rx pin assignment for a bank that supports True-LVDS, but I may get an error in the Fitter. Could I ask the reason.

Banks that support True-LVDS Tx and True-LVDS Rx also have specifications for IOs that support only True-LVDS TX and IOs that support only RX.

For details, please check the Dedicated Tx/Rx Channel column from the Pin List tab in the "Pinout File for Altera Devices" prepared for each device.

・ IOs starting with DIFFIO_RX_* support reception
・ IOs starting with DIFFIO_TX_* support transmission

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