Why do some pins designated as differential in Cyclone® V, Arria® V, and Stratix® V devices have no complimentary pin? - Why do some pins designated as differential in Cyclone® V, Arria® V, and Stratix® V devices have no complimentary pin? Description The differential pin index is usually determined from the largest package of a particular device density in Cyclone® V, Arria® V, or Stratix® V devices. Hence, some differential pairs might not exist for some smaller packages for a given device density. For example, pin DIFFIO_TX_T18p might exist, but DIFFIO_TX_T18n may not exist in a device pin-out for a particular package. Resolution Differential pins that do not have their complementary pair cannot be used for differential functions. Only use pins that are available as a complete pair for differential functions. The differential pin index is usually determined from the largest package of a particular device. Hence, some differential pairs might not exist for some smaller packages within the same device. Custom Fields values: ['novalue'] Troubleshooting 1506816709 False ['novalue'] ['FPGA Dev Tools Quartus® Prime Software Pro'] 15.1 15.1 ['Arria® 10 Bare Die', 'Cyclone® Bare Die', 'Stratix® FPGAs'] ['novalue'] ['novalue'] ['novalue']