KC868-A8 Ethernet Problem

[Namil Heo]

#define ETH_ADDR 0
#define ETH_POWER_PIN -1
#define ETH_MDC_PIN 23
#define ETH_MDIO_PIN 18
#define ETH_TYPE ETH_PHY_LAN8720
#define ETH_CLK_MODE ETH_CLOCK_GPIO17_OUT

IPAddress local_ip(192, 168, 0, 144);
IPAddress gateway(192, 168, 0, 254);
IPAddress subnet(255, 255, 255, 0);

Hello, i have a KC868-A8 Board connected with ethernet cable but the port suddenly stopped working.