Instantiation of CPRI channels with PDD might generate error messages in the Quartus II software for Cyclone IV GX

Description

If you attempt to instantiate two CPRI channels with PLL phase circuitry detector (PFD) feedback turned on, the Fitter generates errors similar to the following:

Error: Following nodes use the same resource INTERQUAD_TXRX_CLK_X0_Y28_N0_I3

Error: Node "lib_xcvr_channel_module:channel_inst0|rx_pcs_clkout" is currently placed at location RXPCS_X0_Y16_N8 with a Global Signal type of Auto

Error: Node "lib_xcvr_channel_module:channel_inst1|rx_pcs_clkout" is currently placed at location RXPCS_X0_Y22_N8 with a Global Signal type of Auto

These errors occur because the Fitter is unable to place the two CPRI channel automatically.

Resolution

Use the quartus_cbf.exe command line executable to regenerate the .hexout file, or close and then reopen the Convert Programming Files dialog box before regenerating the file.