codellama:13b | RAG on

[error]
None

[
  {
    "stage": "extract",
    "code": "extract.no_verilog_found",
    "message": "No module/endmodule block found in model response",
    "retryable": false,
    "details": {}
  }
]

{
  "llm_ok": true,
  "extract_ok": false,
  "syntax_ok": false,
  "functional_ok": false,
  "openlane_ok": false,
  "syntax_required": true,
  "functional_required": true,
  "openlane_required": true,
  "final_success": false,
  "success": false
}

[error]
None

[
  {
    "stage": "extract",
    "code": "extract.no_verilog_found",
    "message": "No module/endmodule block found in model response",
    "retryable": false,
    "details": {}
  }
]

{
  "llm_ok": true,
  "extract_ok": false,
  "syntax_ok": false,
  "functional_ok": false,
  "openlane_ok": false,
  "syntax_required": true,
  "functional_required": true,
  "openlane_required": true,
  "final_success": false,
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}

module freq_divbyfrac(
    input clk,
    input rst_n,
    output reg clk_div
);

// Counter cycles through 7 clock cycles (MUL2_DIV_CLK = 7)
reg [6:0] count;
always @(posedge clk or negedge rst_n) begin
    if (!rst_n) begin
        count <= 0;
    end else begin
        count <= count + 1;
    end
end

// Generate two uneven clock periods: one with 4 source clock cycles and another with 3 source clock cycles
reg [2:0] clk_p, clk_n;
always @(posedge clk or negedge rst_n) begin
    if (!rst_n) begin
        clk_p <= 0;
        clk_n <= 0;
    end else begin
        case (count)
            4'b0001: begin
                clk_p <= 1;
            end
            4'b0010: begin
                clk_p <= 0;
                clk_n <= 1;
            end
            4'b0100: begin
...

[stdout]
Failed at          0: clk=1, clk_div=0 (expected           1)
Failed at          1: clk=0, clk_div=0 (expected           1)
Failed at          3: clk=0, clk_div=1 (expected           0)
Failed at          4: clk=1, clk_div=1 (expected           0)
Failed at          5: clk=0, clk_div=1 (expected           0)
Failed at          6: clk=1, clk_div=1 (expected           0)
Failed at         10: clk=1, clk_div=1 (expected           0)
Failed at         11: clk=0, clk_div=1 (expected           0)
Failed at         12: clk=1, clk_div=1 (expected           0)
Failed at         13: clk=0, clk_div=1 (expected           0)
Failed at         16: clk=1, clk_div=0 (expected           1)
=========== Test completed with          11/20 failures ===========
/workspace/banchmarks/rtllm/13_rtllm_miscellaneous/task_03/tb.v:27: $finish called at 130000 (1ps)

[error]
None

{
  "llm_ok": true,
  "extract_ok": true,
  "syntax_ok": true,
  "functional_ok": true,
  "openlane_ok": true,
  "syntax_required": true,
  "functional_required": true,
  "openlane_required": true,
  "final_success": true,
  "success": true
}

module declaration must be the requested top module.

Task: Please act as a professional Verilog designer. A frequency divider that divides the input clock frequency by fractional values. It generates a clock signal with a fractional frequency division (3.5x), using the double-edge clocking technique to achieve half-integer division while adjusting for duty cycle imbalance. By dividing uneven clock cycles and phase-shifting them, a smooth fractional clock output is produced.

Module name: freq_divbyfrac

Input ports: clk: Input clock signal. rst_n: Active low reset signal to initialize the module.

Output ports: clk_div: Fractionally divided clock output.

Implementation: The module performs fractional frequency division by counting clock cycles and generating an intermediate divided clock signal. For 3.5x division: The counter cycles through 7 clock cycles (MUL2_DIV_CLK = 7). It generates two uneven clock periods: one with 4 source clock cycles and another with 3 source clock cycles. In the next cycle, phase-shifted versions of the divided clock are generated. One phase is delayed by half a clock period, and the other is advanced by half a clock period. Finally, the two intermediate clocks are logically OR-ed to produce the final fractional divided clock output, ensuring the divided clock signal has a uniform period.

Give me the complete code.

Top module: freq_divbyfrac

Constraints: (none)

Reference context: [1] collection=code score=0.8072313
### Natural language description

The provided Verilog code implements a clock divider circuit that generates an output clock signal with a frequency divided by twice the value of the divide_num parameter plus one. The module uses two counters, count_p and count_n, which operate on the positive and negative edges of the input clock clk, respectively. These counters are used to track the number of clock cycles and generate control signals clk_p and clk_n that toggle state when the counter reaches the specified division value. The final output out is produced by XORing these two control signals, resulting in a clock signal that is active for one cycle out of the total division period. The design is sequential, relying on both edges of the input clock for operation, and utilizes registers to maintain state between clock cycles. The parameter divide_num determines the division factor, which must be greater than 1.

[2] collection=books score=0.85868263
ut [0:2] R;
input L, Clock;
output reg [0:2] Q;
</p>
            
            <p>always @(posedge Clock)
if (L)
</p>
...

[stderr]
/data/eval/out/run_20260426_075435_225972_f32200/tmp/codellama/rtllm__13_rtllm_miscellaneous__task_03/sample_4/generated.v:1: syntax error
I give up.

[stderr]
/data/eval/out/run_20260426_075435_225972_f32200/tmp/codellama/rtllm__13_rtllm_miscellaneous__task_03/sample_4/functional/generated.v:1: syntax error
I give up.

[error]
None

[
  {
    "stage": "syntax",
    "code": "syntax.iverilog_failed",
    "message": "/data/eval/out/run_20260426_075435_225972_f32200/tmp/codellama/rtllm__13_rtllm_miscellaneous__task_03/sample_4/generated.v:1: syntax error\nI give up.\n",
    "retryable": false,
    "details": {}
  },
  {
    "stage": "functional",
    "code": "functional.testbench_failed",
    "message": "/data/eval/out/run_20260426_075435_225972_f32200/tmp/codellama/rtllm__13_rtllm_miscellaneous__task_03/sample_4/functional/generated.v:1: syntax error\nI give up.\n",
    "retryable": false,
    "details": {}
  }
]

{
  "llm_ok": true,
  "extract_ok": true,
  "syntax_ok": false,
  "functional_ok": false,
  "openlane_ok": false,
  "syntax_required": true,
  "functional_required": true,
  "openlane_required": true,
  "final_success": false,
  "success": false
}

module freq_divbyfrac(
    input clk,
    input rst_n,
    output reg clk_div
);

// Counter for tracking clock cycles
reg [3:0] count;

// Divided clock signal
wire clk_div_int = count[2];

always @(posedge clk or negedge rst_n) begin
    if (rst_n == 1'b0) begin
        // Reset counter and output clock
        count <= 4'd0;
        clk_div <= 1'b0;
    end else begin
        // Increment counter on positive edge of input clock
        if (clk == 1'b1) begin
            count <= count + 4'd1;
        end
        
        // Generate divided clock signal on negative edge of input clock
        if (clk == 1'b0) begin
            clk_div <= ~clk_div_int;
        end
    end
end

endmodule

[stdout]
Failed at          0: clk=1, clk_div=0 (expected           1)
Failed at          1: clk=0, clk_div=0 (expected           1)
Failed at          2: clk=1, clk_div=0 (expected           1)
Failed at          7: clk=0, clk_div=0 (expected           1)
Failed at          8: clk=1, clk_div=0 (expected           1)
Failed at          9: clk=0, clk_div=0 (expected           1)
Failed at         14: clk=1, clk_div=0 (expected           1)
Failed at         15: clk=0, clk_div=0 (expected           1)
Failed at         16: clk=1, clk_div=0 (expected           1)
=========== Test completed with           9/20 failures ===========
/workspace/banchmarks/rtllm/13_rtllm_miscellaneous/task_03/tb.v:27: $finish called at 130000 (1ps)

[error]
None

{
  "llm_ok": true,
  "extract_ok": true,
  "syntax_ok": true,
  "functional_ok": true,
  "openlane_ok": true,
  "syntax_required": true,
  "functional_required": true,
  "openlane_required": true,
  "final_success": true,
  "success": true
}

[error]
None

[
  {
    "stage": "extract",
    "code": "extract.no_verilog_found",
    "message": "No module/endmodule block found in model response",
    "retryable": false,
    "details": {}
  }
]

{
  "llm_ok": true,
  "extract_ok": false,
  "syntax_ok": false,
  "functional_ok": false,
  "openlane_ok": false,
  "syntax_required": true,
  "functional_required": true,
  "openlane_required": true,
  "final_success": false,
  "success": false
}

[error]
None

[
  {
    "stage": "extract",
    "code": "extract.no_verilog_found",
    "message": "No module/endmodule block found in model response",
    "retryable": false,
    "details": {}
  }
]

{
  "llm_ok": true,
  "extract_ok": false,
  "syntax_ok": false,
  "functional_ok": false,
  "openlane_ok": false,
  "syntax_required": true,
  "functional_required": true,
  "openlane_required": true,
  "final_success": false,
  "success": false
}

[error]
None

[
  {
    "stage": "extract",
    "code": "extract.no_verilog_found",
    "message": "No module/endmodule block found in model response",
    "retryable": false,
    "details": {}
  }
]

{
  "llm_ok": true,
  "extract_ok": false,
  "syntax_ok": false,
  "functional_ok": false,
  "openlane_ok": false,
  "syntax_required": true,
  "functional_required": true,
  "openlane_required": true,
  "final_success": false,
  "success": false
}

[error]
None

[
  {
    "stage": "extract",
    "code": "extract.no_verilog_found",
    "message": "No module/endmodule block found in model response",
    "retryable": false,
    "details": {}
  }
]

{
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  "extract_ok": false,
  "syntax_ok": false,
  "functional_ok": false,
  "openlane_ok": false,
  "syntax_required": true,
  "functional_required": true,
  "openlane_required": true,
  "final_success": false,
  "success": false
}

[error]
None

[
  {
    "stage": "extract",
    "code": "extract.no_verilog_found",
    "message": "No module/endmodule block found in model response",
    "retryable": false,
    "details": {}
  }
]

{
  "llm_ok": true,
  "extract_ok": false,
  "syntax_ok": false,
  "functional_ok": false,
  "openlane_ok": false,
  "syntax_required": true,
  "functional_required": true,
  "openlane_required": true,
  "final_success": false,
  "success": false
}