8/12/2019 Traffic Light Code Explanation
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Code Explanation:
The Traffic_Controller is responsible for handling the state
machine. There is a single state machine
divided into 2 parts namely: 1.) output 2.) state transition.
The output is responsible for outputting what
colors the traffic lights for Traffic light 1, 2, 3 and 4. The
state transition is responsible for handling the
sequence of states and is responsible for checking the status of
sensors/switches. The delay is
responsible for how long or how short the transition is from red
to yellow and yellow to green.
The VGA_Controller is responsible for outputting the necessary
signals to the VGA monitor. It uses a set
of values called VGA timings to match specified resolution which
is 800 x 600.
module
Traffic_Controller(CLOCK_50,CLEAR,R1,R2,R3,R4,X1,X2,X3,X4,state,next_state,g2ydelay,y2rdelay);
output reg [2:0] R1,R2,R3,R4;
input X1,X2,X3,X4;
input CLOCK_50,CLEAR;
output reg [2:0] state;
output reg [2:0] next_state;
output reg [31:0] g2ydelay;
output reg [31:0] y2rdelay;
parameter RED = 3'b100;
parameter YELLOW = 3'b010;
parameter GREEN = 3'b001;
parameter gg2y = 100_000_000;
parameter yy2r = 100_000_000;
8/12/2019 Traffic Light Code Explanation
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Block Diagram Explanation:
The input pins L21,M22,V12,W12,L1,L22 are connected to the
Traffic Controller. The Traffic Controller
also outputs the V22,U21,U22,Y22,W21,W22,etc (these are the
respective LEDs). The VGA Controller is
responsible for the VSYNC, HSYNC, RGB outputs going to the
monitor.
