Problem with "constant driver error"

The example has the disadvantage of not being fully synchronous, causing timing violations und unpredictable results if the gate edge comes at the wrong moment. Gate has to be synchronized to the main clk domain to avoid these effects.

Furthermore, it doesn't work if the Gate signal is shorter than a clock period. Thus, I don't know if it's a solution to cbarberis problem.

The original approach can be basically extended by a handshake signal to avoid the multiple driver issue.

always @ (posedge Gate or posedge GateReset)
begin 
  if (GateReset) 
    temp <= 1'b0; 
  else
    temp <= 1'b1; 
end
always @ (posedge clk) 
begin
  if(temp == 1'b1)
    begin
      clk1 <= clk1 +1;
      if (clk1 < CounterVal)
        PulseOut <= 1'b1;
      else
        begin
          GateReset <= 1;
          PulseOut <= 1'b0; 
          clk1 <=0; 
        end
    end
  else
    GateReset <= 0;
end