Error(13224): Verilog HDL or VHDL error at <your module name>.sv(<your line number>): index <your index> is out of range [<your range>] for '<your variable>' - Error(13224): Verilog HDL or VHDL error at <your module name>.sv(<your line number>): index <your index> is out of range [<your range>] for '<your variable>' Description Due to a problem in the Intel® Quartus® Prime Pro Edition Software version 21.4 and earlier, you may see this error during the Analysis & Synthesis stage. This is due to the parameterized interfaces' failure to override the SystemVerilog interface localparam logic variables with the top-level wrapper variables. In the example below, the interface localparam logic variables ADDR_W and DATA_W, with the parameters of 4 and 1, are not overridden by the top-level wrapper variables, with the parameters of 5 and 8 respectively. Top-level wrapper: module mem_wrapper #( int ADDR_W = 5, int DATA_W = 8 ) ... mem_if #( ADDR_W, DATA_W ) mem_if ( i_clk_a ); mem mem ( mem_if ); ... endmodule : mem_wrapper Interface: interface mem_if #( int ADDR_W = 4, int DATA_W = 1 ) ( input clk ); localparam logic [DATA_W - 1:0] INIT_V [2 ** ADDR_W] = '{default: '1}; ... modport mem ( input clk, addr, wren, idat, output odat ); endinterface : mem_if Modport: module mem ( mem_if.mem mem_if ); logic [mem_if.DATA_W - 1:0] mem [2 ** mem_if.ADDR_W]; initial for(int i = 0; i < 2 ** mem_if.ADDR_W; i++) mem[i] = mem_if.INIT_V[i]; ... endmodule : mem Resolution To avoid this error, do not use the localparam logic in the SystemVerilog interface. For example: Interface: interface mem_if #( int ADDR_W = 4, int DATA_W = 1 ) ( input clk ); logic [DATA_W - 1:0] INIT_V [2 ** ADDR_W] = '{default: '1}; ... modport mem ( input clk, addr, wren, idat, output odat, INIT_V); endinterface : mem_if This problem is fixed starting with the Intel® Quartus® Prime Pro Edition Software version 22.4. Custom Fields values: ['novalue'] Troubleshooting 15010678116 False ['novalue'] ['FPGA Dev Tools Quartus® Prime Software Pro'] 22.4 21.4 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']