Is this a bug or just me with Quartus detecting the clock in an always_block. - Is this a bug or just me with Quartus detecting the clock in an always_block. Hello, I have the following code and the following error when trying to compile in Quartus Prime. Line 72 refers to line 4 of the code snippet. And line 75 refers to line 7 of the code snippet. Critical Warning (10237): Verilog HDL warning at xxx.sv(72): can't infer register for assignment in edge-triggered always construct because the clock isn't obvious. Generated combinational logic instead Critical Warning (10237): Verilog HDL warning at xxx.sv(75): can't infer register for assignment in edge-triggered always construct because the clock isn't obvious. Generated combinational logic instead logic [AVALON_BUS_WIDTH - 1 : 0] read_write_combined [NUM_TOTAL_REG - 1: 0]; always_ff @ (posedge csi_clk or negedge rsi_n) begin if (!rsi_n) begin read_write_combined <= '{default:'0}; end else begin for (int i = 0; i < NUM_CONTROL_REG; i++) begin read_write_combined[i] <= coe_control_reg [((AVALON_BUS_WIDTH)*(i)) +: AVALON_BUS_WIDTH]; end for (int i = 0; i < NUM_STATUS_REG; i++ ) begin read_write_combined[i + NUM_CONTROL_REG] <= coe_status_reg [((AVALON_BUS_WIDTH)*(i)) +: AVALON_BUS_WIDTH]; end end end My question is why is this error being thrown? I have other constructs that look very similar are not throwing this error. Reset is the very first thing in the always block, followed by an else statement with the rest of the code. Clock isn't mentioned at all. Also, how can I fix this? Thank you, Tucker Z Replies: Re: Is this a bug or just me with Quartus detecting the clock in an always_block. I’m glad that your question has been addressed, I now transition this thread to community support. If you have a new question, Feel free to open a new thread or login to ‘ https://supporttickets.intel.com ', view details of the desire request, and post a feed/response within the next 15 days to allow me to continue to support you. After 15 days, this thread will be transitioned to community support. The community users will be able to help you on your follow-up questions. Replies: Re: Is this a bug or just me with Quartus detecting the clock in an always_block. This is embarrassing, the problem was me. The links to my files were wrong so Quartus wasn't getting changes I made to the file and had an old copy that was incorrect.