W5100 first boot failed. It's working after pushing RESET button.

Projects Networking, Protocols, and Devices
1

Hi, everyone,
I bought the W5100 ethernet board (HanRun 11/16) and (HanRun 10/49).
My arduino board is Mega2560 R3.
The 11/16 version always awakes up failed after first boot.
When I push RESET button on W5100 board, it will be working.
But 10/49 version is OK.

I search many software & hardware solutions to avoid potential problems.

http://forum.arduino.cc/index.php/topic,75324.0.html

My code is below:

void setup()
{
//Allow some time after powerup and sketch start, for the Wiznet W5100 Reset IC to release and come out of reset.
delay(250);

pinMode(4, OUTPUT);
digitalWrite(4, HIGH);
pinMode(10, OUTPUT);
digitalWrite(10, LOW);

Ethernet.begin(MAC, IP);
}

void loop()
{
//do something....
}

It still hangs at first boot.......unless I push the RESET button....
Any idea or bug on this version W5100 board?

Thanks a lot.