Description
You might receive the following error when fit the Triple Rate SDI TX and SD-SDI Tx into the same Quad.
Error (164061): Can't place GXB Central Control Unit "SDI_Instance:inst3|sdi_megacore_top:sdi_megacore_top_inst|sdi_txrx_port:sdi_txrx_port_gen[0].u_txrx_port|rc_gxb_tx:gen_tx_alt2gxb.u_gxb|alt2gxb:alt2gxb_component|channel_quad[0].cent_unit" in target device because of its constraints
The fitter report an error because logical PLL number for both instance PLLs are the same, and this happens when we have DPRIO enable. However the SD-SDI instance has pll cascading enable. The input of this pll has to be fed by pll of triple rate SDI.
Resolution
Please create a quartus.ini file in your project directory and include the following setting. farm_s2gx_dprio_bypass_pll_number_check=on