module t_ff_async_pr (
input CLK,
input RST,
input PRE,
input T,
output reg Q
);
always@(posedge CLK or posedge RST or posedge PRE)begin
if(RST)begin
Q <= 0;
end
else if(PRE)begin
Q <= 1;
end
else begin
if(~T)begin
Q <= Q;
end
else begin
Q <= ~Q;
end
end
end
endmodule