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Imants Pulkstenis
2020-02-23 19:12:32 +02:00
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commit e6cbc865aa
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ps3/ps02q/traffic_light_controler.v
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/////////////////////////////////////////////////////////////////
// Author - Imants Pulkstenis
// Date - 23.02.2020
// Project name - PS03
// Module name - Smart traffic light controler
//
// Detailed module description:
//
// Task is to develop a Smart Traffic Light Controller VHDL(Verilog)
// module using finite state machine principle (FSM).
//
// Port description
// | Port name  | Direction  | Description  |
// |------------|------------|--------------------------------------------------------------------------------------------------------------------------|
// | Clk  | In  | 1 GHz clock (1 ns period)  |
// | Rst  | In  | Active low reset  |
// | MR_cars  | In  | An 8-bit input signal indicating the number of waiting cars at the secondary road traffic light. Interpret as unsigned.  |
// | MR_ctl  | Out  | Main road traffic light controlling signal  |
// | SR_ctl  | Out  | Secondary road traffic light controlling signal |
// Output light mapping for MR_ctl and SR_ctl signals to be used
// | Value (2bit binary)  | Light output  |
// |----------------------|-----------------------------------|
// | 00  | No light – traffic light is dark  |
// | 01  | Red light  |
// | 10  | Yellow light  |
// | 11  | Green light |
//
// When rst is low, outputs should be dark, no light visible
// When rst is high then:
// Minimum main road green period length should be at least 30 nanoseconds. When green period ends:
// If there are zero cars waiting on the secondary road, then main road starts the green state again
// If there are less than PARAMETER cars waiting on the secondary road, green period length is extended
// by 30 nanoseconds and then switches to red (and secondary to green)
// If there are equals/more than PARAMETER cars waiting on the secondary road, main road switches to red (and secondary to green)
// Secondary road green period length is 10 nanoseconds, after that, main road switches to green (and secondary to red)
// Each transition (red to green and green to red) should go through 3 nanoseconds yellow light. Yellow lights can happen at the same
// time in both traffic directions.
// MR_ctl and SR_ctl both must not be green at the same time to avoid traffic accidents.
// PARAMETER = 45.
//
// Revision:
// A - initial design
// B -
// C -
//
///////////////////////////////////////////////////////////////////
module smart_tl_ctl #( parameter
PARAMETER = 45,
MR_GREEN_TIME = 30,
SR_GREEN_TIME = 10,
YELLOW_TIME = 3
)(
input clk,
input rst,
input [7:0] MR_cars,
output [1:0] MR_ctl,
output [1:0] SR_ctl);
//-------------Internal Constants---------------------------
localparam [2:0] IDLE = 'h0,
MR_GREEN_1 = 'h1,
MR_GREEN_2 = 'h2,
MR_YELLOW = 'h3,
SR_GREEN = 'h4,
MR_YELLOW = 'h5;
//-------------Internal signals and components--------------
reg [2:0] r_state = IDLE,
r_next = IDLE;
reg [4:0] r_cnt = 'b0;
reg [1:0] MR_ctl = 'b0,
SR_ctl = 'b0;
//------------ assignning combionational logic--------------
assign MR_ctl = r_MR_ctl;
assign SR_ctl = r_SR_ctl;
//---------state register sequential always block-----------
always @(posedge clk ) begin
if (rst)
r_state <= r_next;
else
r_state <= IDLE;
end
//----next state & outputs, combinational always block------
always@(posedge clk) begin
case(r_state)
IDLE: begin
r_MR_ctl = 'b00;
r_SR_ctl = 'b00;
r_next = MR_GREEN_1;
r_cnt = 'd0;
end
MR_GREEN_1: begin
r_MR_ctl = 'b11;
r_SR_ctl = 'b00;
if (r_cnt < MR_GREEN_TIME) begin
r_cnt = r_cnt + 1;
r_next = MR_GREEN_1;
end
else if (r_cnt >= MR_GREEN_TIME) & (MR_cars == 0) begin
r_cnt = 0;
r_next = MR_GREEN_1;
end
else if (r_cnt >= MR_GREEN_TIME) & (MR_cars != 0) begin
r_cnt = 0;
r_next = MR_GREEN_2;
end
end
MR_GREEN_2: begin
r_MR_ctl = 'b11;
r_SR_ctl = 'b00;
if (r_cnt < MR_GREEN_TIME) begin
r_cnt = r_cnt + 1;
r_next = MR_GREEN_2;
end
else if (r_cnt >= MR_GREEN_TIME) begin
r_cnt = 0;
r_next = MR_YELLOW;
end
end
MR_YELLOW: begin
r_MR_ctl = 'b10;
r_SR_ctl = 'b10;
if (r_cnt < YELLOW_TIME) begin
r_cnt = r_cnt + 1;
r_next = MR_YELLOW;
end
else if (r_cnt >= YELLOW_TIME) begin
r_cnt = 0;
r_next = SR_GREEN;
end
end
SR_GREEN: begin
r_MR_ctl = 'b00;
r_SR_ctl = 'b11;
if (r_cnt < SR_GREEN_TIME) begin
r_cnt = r_cnt + 1;
r_next = SR_GREEN;
end
else if (r_cnt >= SR_GREEN_TIME) begin
r_cnt = 0;
r_next = MR_YELLOW;
end
end
MR_YELLOW: begin
r_MR_ctl = 'b10;
r_SR_ctl = 'b10;
if (r_cnt < YELLOW_TIME) begin
r_cnt = r_cnt + 1;
r_next = MR_YELLOW;
end
else if (r_cnt >= YELLOW_TIME) begin
r_cnt = 0;
r_next = MR_GREEN_1;
end
end
default: r_next <= IDLE; // on error
endcase
end
endmodule
ps3/traffic_FSM.graphml
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