diff --git a/tb/sw/src/SlvMain.c b/tb/sw/src/SlvMain.c
index eafb9c8..cac04a1 100644
--- a/tb/sw/src/SlvMain.c
+++ b/tb/sw/src/SlvMain.c
@@ -37,15 +37,19 @@ static inline void error() {
 void main()
 {
 	uint32_t readDat;
-	uint8_t operator;
-	uint16_t downRecvLen;
-	uint16_t upRecvLen;
+	uint32_t operator;
+	uint32_t downRecvLen;
+	uint32_t upRecvLen;
 
-	uint8_t slvNum;
-	uint8_t totNum;
+	uint32_t slvNum;
+	uint32_t totNum;
+
+	uint32_t isLast;
 
 	while(1){
 
+		isLast = *ReadIsLast;
+
 		asm volatile (
 			"1:\n"
 			"andi ra, sp, 0x04\n"
@@ -62,11 +66,11 @@ void main()
 		if( operator == 0 ){
 			slvNum = 64 - ( downRecvLen >> 3 );
 
-			uint16_t localLen = 8;
-			uint16_t downSendLen = downRecvLen - 8;
+			uint32_t localLen = 8;
+			uint32_t downSendLen = downRecvLen - 8;
 
 			//接收本地包
-			for( uint8_t i = 0; i < 8/4; i++ ){
+			for( uint32_t i = 0; i < 8/4; i++ ){
 				asm volatile (
 					"andi ra, sp, 0x08\n"
 					"1:\n"
@@ -75,36 +79,52 @@ void main()
 				readDat = *cdr_0_rx_rxFifo;
 			}
 
-			// 下行包头
-			*cdr_0_tx_txLen = downRecvLen; //downSendLen + 8
-			*cdr_0_tx_txFifo = (downSendLen << 20) |( 0 << 16) | 0;
-			*cdr_0_tx_txFifo = 0;
+			if(!isLast){
+				// 下行转发新建包头
+				*cdr_0_tx_txLen = downRecvLen; //downSendLen + 8
+				*cdr_0_tx_txFifo = (downSendLen << 20) |( 0 << 16) | 0;
+				*cdr_0_tx_txFifo = 0;
 
-			//下行负载
+				//下行转发负载
 				asm volatile (
 					"lui t0, %hi(0x40000000)\n"
 				);		
-			for( uint32_t i = 0; i < (downSendLen >> 2); i++ ){ //一次传4byte
+				for( uint32_t i = 0; i < (downSendLen >> 2); i++ ){ //一次传4byte
+					asm volatile (
+						// "andi ra, sp, 0x08\n"
+						// "1:\n"
+						// "bnez ra, 1b\n" //error 速度不够，不再检查接收
+						// "lui t0, %hi(0x40000000)\n"
+						"lw t1, 0x1c(t0)\n"
+						"sw t1, 0x08(t0)\n"
+
+						// : : : "a0", "a1"
+					);
+					//*cdr_0_tx_txFifo = *cdr_0_rx_rxFifo; //接收即发送			
+				}
+			} else{ //isLast
+
+				//空转掉剩余负载
 				asm volatile (
-					// "andi ra, sp, 0x08\n"
-					// "1:\n"
-					// "bnez ra, 1b\n" //error 速度不够，不再检查接收
-					// "lui t0, %hi(0x40000000)\n"
-					"lw t1, 0x1c(t0)\n"
-					"sw t1, 0x08(t0)\n"
-
-					// : : : "a0", "a1"
-				);
-				//*cdr_0_tx_txFifo = *cdr_0_rx_rxFifo; //接收即发送			
+					"lui t0, %hi(0x40000000)\n"
+				);		
+				for( uint32_t i = 0; i < (downSendLen >> 2); i++ ){ //一次传4byte
+					asm volatile (
+						// "andi ra, sp, 0x08\n"
+						// "1:\n"
+						// "bnez ra, 1b\n" //error 速度不够，不再检查接收
+						// "lui t0, %hi(0x40000000)\n"
+						"lw t1, 0x1c(t0)\n"
+					);		
+				}
 			}
-
-			//CRC
-			asm volatile (
-				"andi ra, sp, 0x08\n"
-				"1:\n"
-				"bnez ra, 1b\n" //error
-			);
-			uint32_t crc = *cdr_0_rx_rxFifo; //CRC
+				//CRC
+				asm volatile (
+					"andi ra, sp, 0x08\n"
+					"1:\n"
+					"bnez ra, 1b\n" //error
+				);
+				uint32_t crc = *cdr_0_rx_rxFifo; //CRC			
 
 			//等待接收完成标志
 			asm volatile (
@@ -115,63 +135,86 @@ void main()
 			);
 
 
-			//上行转发
+			if(!isLast){
+				//上行转发
 
-			//接收第一个包
-			asm volatile (
-				"1:\n"
-				"andi ra, sp, 0x40\n"
-				"beqz ra, 1b\n"
-				"andi sp, sp, 0xBF\n"
-			);
-
-			readDat = *cdr_1_rx_rxFifo;
-			operator = (readDat >> 16) & 0xf;
-			upRecvLen = readDat >> 20;
-			totNum = slvNum + (upRecvLen >> 3) - 1;
-
-			//接收第二个包
-			asm volatile (
-				"andi ra, sp, 0x80\n"
+				//接收第一个包
+				asm volatile (
 					"1:\n"
-					"bnez ra, 1b\n" //error
-			);
-			readDat = *cdr_1_rx_rxFifo;
+					"andi ra, sp, 0x40\n"
+					"beqz ra, 1b\n"
+					"andi sp, sp, 0xBF\n"
+				);
 
-			//发送上行包头
-			*cdr_1_tx_txLen = upRecvLen + 16; //downSendLen + 8
-			*cdr_1_tx_txFifo = ((upRecvLen + 8) << 20) |( 0 << 16) | 0;
-			*cdr_1_tx_txFifo = 0;
+				readDat = *cdr_1_rx_rxFifo;
+				operator = (readDat >> 16) & 0xf;
+				upRecvLen = readDat >> 20;
+				totNum = slvNum + (upRecvLen >> 3) - 1;
 
-			for( uint8_t i = 0; i < 8/4; i ++ ){
+				//接收第二个包
+				asm volatile (
+					"andi ra, sp, 0x80\n"
+						"1:\n"
+						"bnez ra, 1b\n" //error
+				);
+				readDat = *cdr_1_rx_rxFifo;	
+
+				//发送上行包头
+				*cdr_1_tx_txLen = upRecvLen + 16; //upSendLen + 8
+				*cdr_1_tx_txFifo = ((upRecvLen + 8) << 20) |( 0 << 16) | 0;
 				*cdr_1_tx_txFifo = 0;
-			}
 
-			for( uint16_t i = 0; i < upRecvLen >> 2; i ++ ){ //一次传4byte
+				for( uint8_t i = 0; i < 8/4; i ++ ){
+					*cdr_1_tx_txFifo = 0;
+				}
+
+				//上行转发负载
+				asm volatile (
+					"lui t0, %hi(0x40000000)\n"
+				);
+				for( uint16_t i = 0; i < upRecvLen >> 2; i ++ ){ //一次传4byte
+					asm volatile (
+						// "andi ra, sp, 0x80\n"
+						// "1:\n"
+						// "bnez ra, 1b\n" //error 速度不够，不再检查接收
+						"lw t1, 0x9c(t0)\n"
+						"sw t1, 0x88(t0)\n"
+					);
+
+					// *cdr_1_tx_txFifo = *cdr_1_rx_rxFifo; //接收即发送
+				}
+
+				//CRC
 				asm volatile (
 					"andi ra, sp, 0x80\n"
 					"1:\n"
 					"bnez ra, 1b\n" //error
 				);
+				crc = *cdr_1_rx_rxFifo; //CRC
 
-				*cdr_1_tx_txFifo = *cdr_1_rx_rxFifo; //接收即发送
+				//等待接收完成标志
+				asm volatile (
+					"1:\n"
+					"andi ra, sp, 0x80\n"
+					"beqz ra, 1b\n"
+					"andi sp, sp, 0x7F\n"
+				);
+
+
+			} else { //islast
+				//发送上行包头
+				*cdr_1_tx_txLen = 16; //upSendLen + 8
+				*cdr_1_tx_txFifo = (8 << 20) |( 0 << 16) | 0;
+				*cdr_1_tx_txFifo = 0;
+
+				for( uint8_t i = 0; i < 8/4; i ++ ){
+					*cdr_1_tx_txFifo = 0;
+				}
 			}
 
-			//CRC
-			asm volatile (
-				"andi ra, sp, 0x80\n"
-				"1:\n"
-				"bnez ra, 1b\n" //error
-			);
-			crc = *cdr_1_rx_rxFifo; //CRC
 
-			//等待接收完成标志
-			asm volatile (
-				"1:\n"
-				"andi ra, sp, 0x80\n"
-				"beqz ra, 1b\n"
-				"andi sp, sp, 0x7F\n"
-			);
+
+
 
 		} else if ( operator == 1 ){
 			error();