100w Wideband Noise Generator

// Complete 100W Wideband Noise Generator
// Contains all necessary systems for full physical implementation
module complete_noise_generator (
    // System Clock and Control
    input wire clk_in,               // Clock for digital control
    input wire rst_n,                // Master reset
    input wire power_switch,         // Main power switch
    input wire standby_switch,       // Standby mode
    
    // Chua Circuit Core
    // Op-amp controls
    output reg [11:0] opamp1_bias,   // First op-amp bias
    output reg [11:0] opamp2_bias,   // Second op-amp bias
    output reg [3:0] opamp_gain_sel, // Gain selection
    
    // Variable components
    output reg [7:0] ind_tune,       // Inductor tuning
    output reg [3:0] cap_bank_sel,   // Capacitor bank select
    output reg [3:0] res_bank_sel,   // Resistor bank select
    
    // Buffer stages
    output reg [11:0] buf1_bias,     // Input buffer bias
    output reg [11:0] buf2_bias,     // Output buffer bias
    output reg [3:0] buf_gain_sel,   // Buffer gain select
    
    // Chaos Control
    output reg [11:0] chaos_dac,     // Chaos parameter DAC
    output reg [3:0] nonlin_sel,     // Nonlinearity select
    
    // Main RF Chain
    // Driver stage
    output reg [11:0] driver_bias,   // Driver bias control
    output reg [11:0] driver_gain,   // Driver gain control
    output reg driver_enable,        // Driver enable
    
    // Power amplifier
    output reg [11:0] pa_bias,       // PA bias voltage
    output reg [11:0] pa_drive,      // PA input drive
    output reg [3:0] pa_band_sel,    // PA band select
    output reg pa_enable,            // PA enable
    
    // RF Output Control
    output reg [7:0] atten_ctrl,     // Output attenuator
    output reg [3:0] filter_bank,    // Filter selection
    output reg [3:0] match_ctrl,     // Impedance match
    
    // Power Supplies
    // Primary supply
    output reg ps_enable,            // Main PS enable
    output reg ps_crowbar,           // Crowbar protection
    output reg [11:0] ps_voltage,    // Voltage setting
    output reg [11:0] ps_current,    // Current limit
    
    // Secondary supplies
    output reg [3:0] aux_ps_en,      // Aux supply enables
    output reg [11:0] bias_voltage,  // Bias supply setting
    
    // Analog Monitoring
    input wire [11:0] fwd_power,     // Forward power ADC
    input wire [11:0] ref_power,     // Reflected power ADC
    input wire [11:0] pa_current,    // PA current ADC
    input wire [11:0] pa_voltage,    // PA voltage ADC
    input wire [11:0] temp_sense[8], // Temperature sensors
    input wire [11:0] vswr_bridge,   // VSWR bridge
    
    // Protection Inputs
    input wire temp_trip,            // Temperature trip
    input wire vswr_trip,            // VSWR protection
    input wire arc_detect,           // Arc detection
    input wire ps_fault,             // Power supply fault
    input wire current_trip,         // Current protection
    input wire door_interlock,       // Cabinet interlock
    
    // Protection Outputs
    output reg protect_trip,         // Protection active
    output reg fast_shutdown,        // Emergency shutdown
    output reg fault_latch,          // Fault latch
    
    // Cooling System
    output reg [7:0] fan_speed,      // Fan control
    input wire fan_tach,             // Fan speed sensor
    input wire airflow_ok,           // Airflow sensor
    
    // User Interface
    input wire [11:0] freq_pot,      // Frequency control
    input wire [11:0] power_pot,     // Power control
    output reg [3:0] status_leds,    // Status indicators
    
    // LCD Interface (Frequency Display)
    output reg [7:0] lcd_data,       // LCD data
    output reg lcd_rs,               // Register select
    output reg lcd_en                // Enable
);

// System Parameters
parameter [11:0] 
    MAX_POWER = 12'h640,    // 100W
    MAX_VSWR = 12'h300,     // 3:1 VSWR
    MAX_TEMP = 12'h550,     // 85°C
    MAX_CURRENT = 12'h800;  // Current limit

// Operating States
localparam [3:0]
    STATE_OFF = 4'h0,
    STATE_INIT = 4'h1,
    STATE_STANDBY = 4'h2,
    STATE_STARTUP = 4'h3,
    STATE_RUN = 4'h4,
    STATE_FAULT = 4'h5,
    STATE_SHUTDOWN = 4'h6;

// System State
reg [3:0] state;
reg [7:0] seq_state;
reg [15:0] startup_timer;
reg protection_active;

// Temperature Management
reg [11:0] max_temp;
reg [7:0] temp_state;

// Power Management
reg [11:0] current_power;
reg [7:0] power_state;

// Frequency Management
reg [23:0] freq_display;
reg [3:0] lcd_state;

// Main State Machine
always @(posedge clk_in or negedge rst_n) begin
    if (!rst_n) begin
        init_system();
    end else begin
        case (state)
            STATE_OFF: begin
                if (power_switch && check_interlocks())
                    state <= STATE_INIT;
            end
            
            STATE_INIT: begin
                if (init_sequence_complete())
                    state <= STATE_STANDBY;
            end
            
            STATE_STANDBY: begin
                maintain_standby();
                if (!standby_switch && system_ready())
                    state <= STATE_STARTUP;
            end
            
            STATE_STARTUP: begin
                if (execute_startup())
                    state <= STATE_RUN;
            end
            
            STATE_RUN: begin
                if (!check_protection())
                    state <= STATE_FAULT;
                else begin
                    run_system();
                    monitor_system();
                end
            end
            
            STATE_FAULT: begin
                handle_fault();
            end
            
            STATE_SHUTDOWN: begin
                execute_shutdown();
                if (shutdown_complete())
                    state <= STATE_OFF;
            end
        endcase
        
        // Always running tasks
        update_protection();
        manage_cooling();
        update_display();
    end
end

// System Tasks
task init_system;
begin
    // Reset all outputs
    protect_trip <= 1'b1;
    fast_shutdown <= 1'b0;
    fault_latch <= 1'b0;
    
    // Power system init
    ps_enable <= 1'b0;
    ps_crowbar <= 1'b0;
    aux_ps_en <= 4'h0;
    
    // RF chain init
    pa_enable <= 1'b0;
    driver_enable <= 1'b0;
    atten_ctrl <= 8'hFF;
    
    // Set safe states
    opamp_gain_sel <= 4'h0;
    cap_bank_sel <= 4'h0;
    res_bank_sel <= 4'h0;
    
    // Reset timers/states
    startup_timer <= 16'h0000;
    seq_state <= 8'h00;
    protection_active <= 1'b0;
end
endtask

// Power Supply Sequencing
task execute_startup;
begin
    case (seq_state)
        8'h00: begin // Enable aux supplies
            aux_ps_en <= 4'hF;
            if (startup_timer > 16'h0100)
                seq_state <= 8'h01;
            else
                startup_timer <= startup_timer + 1;
        end
        
        8'h01: begin // Set bias voltages
            bias_voltage <= 12'h800;
            opamp1_bias <= 12'h400;
            opamp2_bias <= 12'h400;
            if (startup_timer > 16'h0200)
                seq_state <= 8'h02;
            else
                startup_timer <= startup_timer + 1;
        end
        
        8'h02: begin // Enable main PS
            ps_enable <= 1'b1;
            ps_voltage <= 12'h000;
            if (startup_timer > 16'h0300)
                seq_state <= 8'h03;
            else
                startup_timer <= startup_timer + 1;
        end
        
        8'h03: begin // Ramp main voltage
            if (ps_voltage < 12'hFFF)
                ps_voltage <= ps_voltage + 12'h010;
            else
                seq_state <= 8'h04;
        end
        
        8'h04: begin // Enable RF chain
            driver_enable <= 1'b1;
            if (startup_timer > 16'h0400)
                seq_state <= 8'h05;
            else
                startup_timer <= startup_timer + 1;
        end
        
        8'h05: begin // Final enable
            pa_enable <= 1'b1;
            protect_trip <= 1'b0;
            execute_startup = 1'b1;
        end
    endcase
end
endtask

// Core Circuit Control
task run_system;
begin
    // Update Chua parameters from frequency control
    tune_chua_circuit();
    
    // Update RF chain
    control_rf_chain();
    
    // Monitor and adjust power
    manage_power_level();
    
    // Update matching network
    adjust_impedance_match();
end
endtask

// Chua Circuit Control
task tune_chua_circuit;
begin
    // Set inductor tuning from frequency pot
    ind_tune <= freq_pot[11:4];
    
    // Select appropriate capacitor bank
    case (freq_pot[11:8])
        4'h0: cap_bank_sel <= 4'h1;  // Lowest range
        4'h1: cap_bank_sel <= 4'h2;
        4'h2: cap_bank_sel <= 4'h4;
        4'h3: cap_bank_sel <= 4'h8;  // Highest range
        default: cap_bank_sel <= 4'h1;
    endcase
    
    // Adjust op-amp gains
    opamp_gain_sel <= freq_pot[7:4];
    
    // Set chaos parameters
    chaos_dac <= {freq_pot[11:4], 4'h0};
    
    // Update buffer stages
    buf1_bias <= 12'h400 + {4'h0, freq_pot[11:4]};
    buf2_bias <= 12'h400 + {4'h0, freq_pot[11:4]};
end
endtask

// RF Chain Control
task control_rf_chain;
begin
    // Set driver stage
    driver_bias <= 12'h400 + {4'h0, power_pot[11:4]};
    driver_gain <= power_pot;
    
    // Set PA stage
    pa_bias <= 12'h600 + {4'h0, power_pot[11:4]};
    pa_drive <= power_pot;
    
    // Select output filter bank
    filter_bank <= freq_pot[11:8];
    
    // Set attenuator for power control
    atten_ctrl <= power_pot[11:4];
end
endtask

// Power Management
task manage_power_level;
begin
    // Calculate current power
    current_power <= (fwd_power * fwd_power) >> 4;
    
    // Adjust drive if needed
    if (current_power > {4'h0, power_pot})
        pa_drive <= pa_drive - 12'h010;
    else if (current_power < {4'h0, power_pot})
        pa_drive <= pa_drive + 12'h001;
        
    // Monitor current
    if (pa_current > MAX_CURRENT)
        protect_trip <= 1'b1;
end
endtask

// Protection System
task update_protection;
begin
    protection_active = 
        temp_trip || vswr_trip || arc_detect || 
        ps_fault || current_trip || !door_interlock ||
        !airflow_ok || (max_temp > MAX_TEMP);
        
    if (protection_active) begin
        protect_trip <= 1'b1;
        if (arc_detect || current_trip) begin
            fast_shutdown <= 1'b1;
            ps_crowbar <= 1'b1;
        end
    end
end
endtask

// Thermal Management
task manage_cooling;
integer i;
begin
    // Find maximum temperature
    max_temp = 12'h000;
    for (i = 0; i < 8; i = i + 1)
        if (temp_sense[i] > max_temp)
            max_temp = temp_sense[i];
            
    // Set fan speed
    if (max_temp > (MAX_TEMP - 12'h080))
        fan_speed <= 8'hFF;  // Full speed
    else
        fan_speed <= 8'h20 + max_temp[11:4];
end
endtask

// Output Matching
task adjust_impedance_match;
begin
    // Calculate VSWR
    if (fwd_power > 12'h010) begin  // Only adjust if power present
        if (ref_power > (fwd_power >> 4)) begin
            if (match_ctrl < 4'hF)
                match_ctrl <= match_ctrl + 1;
        end else if (match_ctrl > 4'h0) begin
            match_ctrl <= match_ctrl - 1;
        end
    end
end
endtask

// Display Update
task update_display;
reg [23:0] freq;
begin
    // Convert pot value to frequency
    freq = {12'h000, freq_pot} * 24'd100;  // Scale to kHz
    
    // Only update if changed
    if (freq != freq_display) begin
        freq_display <= freq;
        format_display(freq);
    end
end
endtask

// LCD Helper Tasks
task format_display;
    input [23:0] freq;
    // LCD formatting implementation
endtask

// Status Update
always @(posedge clk_in) begin
    status_leds <= {
        ps_enable,          // Power good
        protection_active,  // Protection status
        pa_enable,         // PA status
        door_interlock     // Interlock status
    };
end

// LCD Formatting and Control
task format_display;
    input [23:0] freq;
    reg [3:0] digits[5:0];
    integer i;
begin
    // Convert frequency to digits
    for (i = 0; i < 6; i = i + 1) begin
        digits[i] = freq % 10;
        freq = freq / 10;
    end
    
    // Update LCD buffer
    case (lcd_state)
        4'h0: begin // Set address
            lcd_rs <= 1'b0;
            lcd_data <= 8'h80;
            lcd_state <= 4'h1;
        end
        
        4'h1: begin // Write "FREQ:"
            lcd_rs <= 1'b1;
            lcd_data <= "F";
            lcd_state <= 4'h2;
        end
        
        4'h2: begin lcd_data <= "r"; lcd_state <= 4'h3; end
        4'h3: begin lcd_data <= "e"; lcd_state <= 4'h4; end
        4'h4: begin lcd_data <= "q"; lcd_state <= 4'h5; end
        4'h5: begin lcd_data <= ":"; lcd_state <= 4'h6; end
        4'h6: begin lcd_data <= " "; lcd_state <= 4'h7; end
        
        4'h7: begin // Write frequency digits
            lcd_data <= digits[5] + 8'h30;
            lcd_state <= 4'h8;
        end
        
        4'h8: begin lcd_data <= digits[4] + 8'h30; lcd_state <= 4'h9; end
        4'h9: begin lcd_data <= digits[3] + 8'h30; lcd_state <= 4'hA; end
        4'hA: begin lcd_data <= digits[2] + 8'h30; lcd_state <= 4'hB; end
        4'hB: begin lcd_data <= digits[1] + 8'h30; lcd_state <= 4'hC; end
        4'hC: begin lcd_data <= digits[0] + 8'h30; lcd_state <= 4'hD; end
        
        4'hD: begin lcd_data <= " "; lcd_state <= 4'hE; end
        4'hE: begin lcd_data <= "k"; lcd_state <= 4'hF; end
        4'hF: begin 
            lcd_data <= "H"; 
            lcd_state <= 4'h0;
        end
    endcase
end
endtask

// System Safety Checks
function check_interlocks;
begin
    check_interlocks = door_interlock && 
                      airflow_ok && 
                      !ps_fault && 
                      !temp_trip;
end
endfunction

function system_ready;
begin
    system_ready = check_interlocks() && 
                  !protection_active &&
                  (max_temp < MAX_TEMP) &&
                  (pa_current < MAX_CURRENT);
end
endfunction

// Standby Mode Management
task maintain_standby;
begin
    // Keep supplies enabled but RF disabled
    ps_enable <= 1'b1;
    aux_ps_en <= 4'hF;
    pa_enable <= 1'b0;
    driver_enable <= 1'b0;
    
    // Maintain minimum bias
    opamp1_bias <= 12'h200;
    opamp2_bias <= 12'h200;
    bias_voltage <= 12'h400;
    
    // Keep cooling active
    manage_cooling();
end
endtask

// Shutdown Sequence
task execute_shutdown;
begin
    case (seq_state)
        8'h00: begin // Disable RF
            pa_enable <= 1'b0;
            driver_enable <= 1'b0;
            seq_state <= 8'h01;
        end
        
        8'h01: begin // Ramp down voltage
            if (ps_voltage > 12'h000)
                ps_voltage <= ps_voltage - 12'h010;
            else
                seq_state <= 8'h02;
        end
        
        8'h02: begin // Disable supplies
            ps_enable <= 1'b0;
            aux_ps_en <= 4'h0;
            seq_state <= 8'h03;
        end
        
        8'h03: begin // Final shutdown
            protect_trip <= 1'b1;
            ps_crowbar <= 1'b0;
            // Hold minimum fan speed
            fan_speed <= 8'h20;
            seq_state <= 8'h04;
        end
    endcase
end
endtask

// Fault Management
task handle_fault;
begin
    // Immediate actions
    pa_enable <= 1'b0;
    driver_enable <= 1'b0;
    protect_trip <= 1'b1;
    
    // Record fault condition
    if (temp_trip || (max_temp > MAX_TEMP))
        fault_latch <= 1'b1;
    if (arc_detect || current_trip) begin
        ps_crowbar <= 1'b1;
        fast_shutdown <= 1'b1;
    end
    
    // Maintain cooling
    fan_speed <= 8'hFF;
    
    // Wait for reset to clear
    if (!power_switch)
        state <= STATE_SHUTDOWN;
end
endtask

// Shutdown Completion Check
function shutdown_complete;
begin
    shutdown_complete = !pa_enable && 
                       !driver_enable && 
                       !ps_enable &&
                       (ps_voltage == 12'h000);
end
endfunction

// Initialization Completion Check
function init_sequence_complete;
begin
    init_sequence_complete = (aux_ps_en == 4'hF) &&
                           !ps_fault &&
                           check_interlocks() &&
                           (startup_timer > 16'h0100);
end
endfunction

endmodule