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  1. Hi @jpeyron, According to the constraints file provided by Diligent, pins A0 - A5 each one is allocated a dual constraint. Why dual n & p ? if n for negative, we can connect to GND pin. __________________________________________________________________________________________________________ ##ChipKit Single Ended Analog Inputs ##NOTE: The ck_an_p pins can be used as single ended analog inputs with voltages from 0-3.3V (Chipkit Analog pins A0-A5). ## These signals should only be connected to the XADC core. When using these pins as digital I/O, use pins ck_io[14-19]. #set_property -dict { PACKAGE_PIN C5 IOSTANDARD LVCMOS33 } [get_ports { ck_an_n[0] }]; #IO_L1N_T0_AD4N_35 Sch=ck_an_n[0] #set_property -dict { PACKAGE_PIN C6 IOSTANDARD LVCMOS33 } [get_ports { ck_an_p[0] }]; #IO_L1P_T0_AD4P_35 Sch=ck_an_p[0] #set_property -dict { PACKAGE_PIN A5 IOSTANDARD LVCMOS33 } [get_ports { ck_an_n[1] }]; #IO_L3N_T0_DQS_AD5N_35 Sch=ck_an_n[1] #set_property -dict { PACKAGE_PIN A6 IOSTANDARD LVCMOS33 } [get_ports { ck_an_p[1] }]; #IO_L3P_T0_DQS_AD5P_35 Sch=ck_an_p[1] #set_property -dict { PACKAGE_PIN B4 IOSTANDARD LVCMOS33 } [get_ports { ck_an_n[2] }]; #IO_L7N_T1_AD6N_35 Sch=ck_an_n[2] #set_property -dict { PACKAGE_PIN C4 IOSTANDARD LVCMOS33 } [get_ports { ck_an_p[2] }]; #IO_L7P_T1_AD6P_35 Sch=ck_an_p[2] #set_property -dict { PACKAGE_PIN A1 IOSTANDARD LVCMOS33 } [get_ports { ck_an_n[3] }]; #IO_L9N_T1_DQS_AD7N_35 Sch=ck_an_n[3] #set_property -dict { PACKAGE_PIN B1 IOSTANDARD LVCMOS33 } [get_ports { ck_an_p[3] }]; #IO_L9P_T1_DQS_AD7P_35 Sch=ck_an_p[3] #set_property -dict { PACKAGE_PIN B2 IOSTANDARD LVCMOS33 } [get_ports { ck_an_n[4] }]; #IO_L10N_T1_AD15N_35 Sch=ck_an_n[4] #set_property -dict { PACKAGE_PIN B3 IOSTANDARD LVCMOS33 } [get_ports { ck_an_p[4] }]; #IO_L10P_T1_AD15P_35 Sch=ck_an_p[4] #set_property -dict { PACKAGE_PIN C14 IOSTANDARD LVCMOS33 } [get_ports { ck_an_n[5] }]; #IO_L1N_T0_AD0N_15 Sch=ck_an_n[5] #set_property -dict { PACKAGE_PIN D14 IOSTANDARD LVCMOS33 } [get_ports { ck_an_p[5] }]; #IO_L1P_T0_AD0P_15 Sch=ck_an_p[5] thanks.