diff --git a/df_datalink_ge/src/main.c b/df_datalink_ge/src/main.c
index 830e325..e7174a9 100644
--- a/df_datalink_ge/src/main.c
+++ b/df_datalink_ge/src/main.c
@@ -416,6 +416,10 @@ void ScuTimer_IntrHandler(void *context)
 	{
 		// Refresh log
 		Phy_RefreshHwSate(phyInstPtr);
+		if (TimeCtrl_GetIntCnt(tmcInstPtr) - phyInstPtr->lastLogTime >= PHY_LOG_EXPIRE)
+		{
+			Phy_UpdateLogging(phyInstPtr);
+		}
 
 		if (Mpc_IsEnable(mpcDescPtr))
 		{
@@ -494,7 +498,7 @@ int main(void)
 	}
 
 	/* Physical Layer Initialize */
-	Status = Phy_InstInit(&phyInstPtr, &phyConfig);
+	Status = Phy_Init(&phyInstPtr, &phyConfig);
 	if (Status == SUCCESS)
 	{
 		DBG_PRINT("Physical layer Init SUCCESS! \n");
diff --git a/df_datalink_sp/src/main.c b/df_datalink_sp/src/main.c
index f865ce0..3dd51bb 100644
--- a/df_datalink_sp/src/main.c
+++ b/df_datalink_sp/src/main.c
@@ -360,6 +360,11 @@ void ScuTimer_IntrHandler(void *context)
 	{
 		// Refresh log
 		Phy_RefreshHwSate(phyInstPtr);
+		if (TimeCtrl_GetIntCnt(tmcInstPtr) - phyInstPtr->lastLogTime >= PHY_LOG_EXPIRE)
+		{
+			Phy_UpdateLogging(phyInstPtr);
+		}
+
 		XScuTimer_ClearInterruptStatus((XScuTimer *)xdesc->instance);
 	}
 	else
@@ -420,7 +425,7 @@ int main(void)
 	}
 
 	/* Physical Layer Initialize */
-	Status = Phy_InstInit(&phyInstPtr, &phyConfig);
+	Status = Phy_Init(&phyInstPtr, &phyConfig);
 	if (Status == SUCCESS)
 	{
 		DBG_PRINT("Physical layer Init SUCCESS! \n");
diff --git a/df_datalink_sp/src/networking/phy_layer/phy_layer.c b/df_datalink_sp/src/networking/phy_layer/phy_layer.c
index 3e3be6e..86b701c 100644
--- a/df_datalink_sp/src/networking/phy_layer/phy_layer.c
+++ b/df_datalink_sp/src/networking/phy_layer/phy_layer.c
@@ -35,6 +35,9 @@
 #endif
 
 /************************** Constant Definitions *****************************/
+#define PHY_TIME_WORD_H_MAX UINT32_MAX
+#define PHY_TIME_WORD_L_MAX 0x0007A120 // 5ms/10ns
+
 #define L1_FRAME_LEN_MAX (8192 / 8)			// byte
 #define L1_FRAME_2KBPS_20MS_LEN 0			// byte
 #define L1_FRAME_2KBPS_100MS_LEN (312 / 8)	// byte
@@ -318,7 +321,22 @@ void Phy_UpdateState(PHY_INST *instPtr)
 	{
 		instPtr->isValid = false;
 	}
+	Phy_UpdateLogging(instPtr);
+}
 
+/*****************************************************************************/
+/**
+ * @brief	Update physical layer logging.
+ *
+ * @param   instPtr A pointer to physical layer control instance.
+ *
+ * @return	NONE.
+ *
+ ******************************************************************************/
+void Phy_UpdateLogging(PHY_INST *instPtr)
+{
+	ASSERT(instPtr != NULL);
+	uint64_t peak, avg;
 	// Logging
 	instPtr->recvSlotTime.int_part = PhyRead(instPtr, TM_TARGET_H);
 	instPtr->recvSlotTime.frac_part = PhyRead(instPtr, TM_TARGET_L);
@@ -330,7 +348,6 @@ void Phy_UpdateState(PHY_INST *instPtr)
 	instPtr->phyLog.crcCnt = PhyRead(instPtr, PHY_CRC_OK_CNT);
 	instPtr->phyLog.doppler = Phy_GetFreqEst(instPtr);
 	instPtr->phyLog.recvStamp = (uint64_t)instPtr->recvFsTime.int_part * TIME_FRAC_MAX + instPtr->recvFsTime.frac_part;
-	uint64_t peak, avg;
 	peak = PhyRead(instPtr, PHY_ACQ_PEAK_L);
 	peak |= ((uint64_t)PhyRead(instPtr, PHY_ACQ_PEAK_H)) << 32;
 	avg = PhyRead(instPtr, PHY_ACQ_MEAN_L);
@@ -348,6 +365,7 @@ void Phy_UpdateState(PHY_INST *instPtr)
 	memset(instPtr->phyLog.reserve, 0x00, sizeof(instPtr->phyLog.reserve));
 	// Sync logs to system monitor
 	SysMonitor_UpdatePhysicalLayerLog(&(instPtr->phyLog));
+	instPtr->lastLogTime = PhyRead(instPtr, TM_TARGET_H);
 }
 
 /*****************************************************************************/
@@ -361,7 +379,7 @@ void Phy_UpdateState(PHY_INST *instPtr)
  * @return  SUCCESS
  *
  ******************************************************************************/
-int32_t Phy_InstInit(PHY_INST **instPtr, PHY_CONFIG *phyConfig)
+int32_t Phy_Init(PHY_INST **instPtr, PHY_CONFIG *phyConfig)
 {
 	ASSERT(instPtr != NULL);
 	ASSERT(phyConfig != NULL);
@@ -387,6 +405,7 @@ int32_t Phy_InstInit(PHY_INST **instPtr, PHY_CONFIG *phyConfig)
 	(*instPtr)->recvSlotTime.frac_part = UINT32_MAX;
 	(*instPtr)->antConfigOffset = 0;
 	(*instPtr)->sendDataOffset = 0;
+	(*instPtr)->lastLogTime = 0;
 	Phy_AntConfigInit(&((*instPtr)->antConfig));
 
 	memset(&((*instPtr))->tor, PHY_TOR_SUSPEND, sizeof(PHY_RCD));
diff --git a/df_datalink_sp/src/networking/phy_layer/phy_layer.h b/df_datalink_sp/src/networking/phy_layer/phy_layer.h
index f1cb5d7..df82465 100644
--- a/df_datalink_sp/src/networking/phy_layer/phy_layer.h
+++ b/df_datalink_sp/src/networking/phy_layer/phy_layer.h
@@ -53,8 +53,7 @@
 #define L1_FRAME_200KBPS_5MS_HOPS 20
 #define L1_FRAME_1M2BPS_5MS_HOPS 20
 
-#define PHY_TIME_WORD_H_MAX UINT32_MAX
-#define PHY_TIME_WORD_L_MAX 0x0007A120 // 5ms/10ns
+#define PHY_LOG_EXPIRE	40 // 50*5ms
 /***************** Macros (Inline Functions) Definitions *********************/
 /**************************** Type Definitions *******************************/
 typedef enum
@@ -227,6 +226,7 @@ typedef struct
 	PHY_ANT_ANGLE antNrrwPattern[L1_NUM_ANT_NRRW_PATTERN];
 	HWSTATE hwSate;
 	PHYLOG phyLog;
+	uint32_t lastLogTime;
 } PHY_INST;
 
 /************************** Variable Definitions *****************************/
@@ -242,10 +242,11 @@ extern uint16_t hopPattern_200KBPS_5MS[L1_FRAME_200KBPS_5MS_HOPS];
 extern uint16_t hopPattern_1M2BPS_5MS[L1_FRAME_1M2BPS_5MS_HOPS];
 
 /************************** Function Prototypes ******************************/
-int32_t Phy_InstInit(PHY_INST **instPtr, PHY_CONFIG *phyConfig);
+int32_t Phy_Init(PHY_INST **instPtr, PHY_CONFIG *phyConfig);
 void Phy_Destroy(PHY_INST *instPtr);
 
 void Phy_UpdateState(PHY_INST *instPtr);
+void Phy_UpdateLogging(PHY_INST *instPtr);
 void Phy_RefreshHwSate(PHY_INST *instPtr);
 
 void Phy_Start(PHY_INST *instPtr);