TV Decoder

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hello, i am trying to blink the ledg[3] on the de2 Board with the following code but i don't have succes, i think that Problem is on (posedge iTD_VS) the V Sync output of the TV Decoder....how could i resolve it

assign oLEDG[3] = SW_RST;

reg SW_RST;

reg [1:0]SA;

reg [1:0]PRE_SA;

always @( posedge iTD_VS ) begin

if ( SA != PRE_SA )

begin

SW_RST = 0;

PRE_SA = SA;

end

else

begin

SA = iSW[17:16] ;

SW_RST = 1;

end

end

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reg cnt;//6 bit for 50hz Vframe LED will blink with 50/64=0.8HZ. for 60 hz vframe LED will blink 0.94hz. 
assign oLEDG = cnt;
 
always @( posedge iTD_VS ) begin
cnt <= cnt+1'b1;
 end