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stopwatch_state.v
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191 lines (181 loc) · 5.78 KB
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`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Company:
// Engineer:
//
// Create Date: 11/26/2017 08:22:11 AM
// Design Name:
// Module Name: stopwatch_state
// Project Name:
// Target Devices:
// Tool Versions:
// Description:
//
// Dependencies:
//
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
//
//////////////////////////////////////////////////////////////////////////////////
module stopwatch_state(
input clk,
input start,
input rst,
input T_comp,
output reg [1:0] T_s,
output reg T_ld/*,
output reg led*/
);
localparam [1:0] SW_Init = 0,
SW_Tick = 1,
SW_Pause = 2;
reg [1:0] SW_State;
reg [1:0] next_state;
reg [1:0] State_Toggle;
localparam [1:0] State_s0 = 0, State_s1 = 1, State_s2 = 2, State_s3 = 3;
reg tick;
initial begin
SW_State = SW_Init;
State_Toggle = State_s0;
tick = 1'b0;
T_ld = 1;
T_s = 1'b00;
end
always@(*)begin
end
always@(posedge clk) begin
if(rst) begin
SW_State = SW_Init;
State_Toggle = State_s0;
tick = 0;
//led = 0;
end
else begin
// if(start) begin
// tick = !tick;
// end
// else begin
case(State_Toggle)
State_s0 : begin
if(!start)
State_Toggle = State_s0;
else if(rst)
State_Toggle = State_s0;
else
State_Toggle = State_s1;
end
State_s1 : begin
if(start)
State_Toggle = State_s1;
else if(rst)
State_Toggle = State_s0;
else
State_Toggle = State_s2;
end
State_s2 : begin
if(!start)
State_Toggle = State_s2;
else if(rst)
State_Toggle = State_s0;
else
State_Toggle = State_s3;
end
State_s3 : begin
if(!start)
State_Toggle = State_s0;
else if(rst)
State_Toggle = State_s0;
else
State_Toggle = State_s3;
end
default : begin
State_Toggle = State_s0;
end
endcase
case(State_Toggle)
State_s0 : begin
tick = 1'b0;
end
State_s1 : begin
tick = 1'b1;
end
State_s2 : begin
tick = 1'b1;
end
State_s3 : begin
tick = 1'b0;
end
default : begin
tick = 1'b0;
end
endcase
case(SW_State)
SW_Init : begin
if(rst) begin
SW_State = SW_Init;
end
else if(tick && !rst && !T_comp) begin
SW_State = SW_Tick;
end
else if(!rst && T_comp) begin
SW_State = SW_Pause;
end
else begin
SW_State = SW_Init;
end
end
SW_Tick : begin
if(rst) begin
SW_State = SW_Init;
end
else if(tick && !T_comp && !rst) begin
SW_State = SW_Tick;
end
else if(!rst &&(!tick || (tick && T_comp))) begin
SW_State = SW_Pause;
end
else begin
SW_State = SW_Init;
end
end
SW_Pause : begin
if(rst) begin
SW_State = SW_Init;
end
else if(!rst &&(!tick || (tick && T_comp))) begin
SW_State = SW_Pause;
end
else if(tick && !rst && !T_comp) begin
SW_State = SW_Tick;
end
else begin
SW_State = SW_Init;
end
end
default : begin
SW_State = SW_Init;
end
endcase
// end
end
case(SW_State)
SW_Init : begin
T_s = 2'b00;//output initial value
T_ld = 1'b1;
end
SW_Tick : begin
T_s = 2'b01;//output incremented value
T_ld = 1'b1;
end
SW_Pause : begin
T_s = 2'b10;//output itself (paused)
T_ld = 1'b1;
end
default : begin
T_s = 2'b00;
T_ld = 1'b1;
end
endcase
end
endmodule