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  1. Hi Jon, Thank you for your good advice. According to the tutorial here, I found that registers "slv_reg[1-4]" should not be written. Instead I prepared other register and change the read process of the register as follows: Insert these lines: signal my_in0_reg : std_logic_vector(C_S_AXI_DATA_WIDTH-1 downto 0); and -- Users to add ports here S_MY_IN0 : in std_logic_vector(3 downto 0); -- User ports ends and -- Add user logic here process( S_AXI_ACLK ) is begin if (rising_edge (S_AXI_ACLK)) then if ( S_AXI_ARESETN = '0' ) then my_in0_reg <= (others => '0'); else my_in0_reg(3 downto 0) <= S_MY_IN0(3 downto 0); end if; end if; end process; -- User logic ends And, change next line. -- reg_data_out <= slv_reg1; reg_data_out <= my_in0_reg; Anyway, my probrem is solved. Thank you very much. Shiro
  2. I'm trying to create a hardware using custom ip which capture button status in a register. But, error of multiple driver nets occurred. Could you help me to solve this error please ? I created project according to ZYBO tutorials as follows: 1. Create project and create new IP. 2. Edit IP: add port and logic in myip_v1_0_S00_AXI.v ------------------ // Users to add ports here input wire [3:0] MY_IN0, // User ports ends ------------------------ // Add user logic here always @( posedge S_AXI_ACLK ) begin if ( S_AXI_ARESETN == 1'b0 ) begin slv_reg1 <= 0; end else begin slv_reg1[3:0] <= MY_IN0; end end // User logic ends --------------- 3. Create Block Design: Add ZYNQ, my IP and external port and connect them. 4. Generate Block Design and Create HDL Wrapper 5. Open erabolated design: Connect myip ports to ZYBO button to generate xdc file. 6. Run synthesis is successfully completed. 7. Run implementation generate several errors. [DRC MDRV-1] Multiple Driver Nets: Net design_1_i/myip_0/inst/myip_v1_0_S00_AXI_inst/slv_reg1[0] has multiple drivers: design_1_i/myip_0/inst/myip_v1_0_S00_AXI_inst/slv_reg1_reg[0]/Q, and design_1_i/myip_0/inst/myip_v1_0_S00_AXI_inst/slv_reg1_reg[0]__0/Q. I attach the screen shot and my project. Anyone can help me, please ?