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W5300 Datasheet(PDF) 93 Page - WIZnet Co., Ltd |
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W5300 Datasheet(HTML) 93 Page - WIZnet Co., Ltd |
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93 / 128 page  © Copyright 2008-2014 WIZnet Co.,Ltd. All rights reserved. 93 When the 3 initialization-steps are successfully processed, W5300 is available for data communication through Ethernet. From this time, W5300 can transmit the Ping-reply to the Ping-request packet (Auto-ping-reply) 5.2 Data Communication After initialization, W5300 can transmit or receive data by opening the SOCKET as TCP, UDP, IPRAW, or MACRAW mode. W5300 supports 8 SOCKETs to be used independently and simultaneously. In this chapter, the communication method in each mode is described. 5.2.1 TCP TCP is the connection-oriented protocol. At the TCP, a connection SOCKET is established by pairing its IP address & port number with the peer ’s ones. Through this connection SOCKET, data can be transmitted and received. There are "TCP SERVER" and "TCP CLIENT" in the method of establishing connection SOCKET. The method can be distinguished according as who transmits connect-request (SYN packet). "TCP SERVER" waits for connect-request from the peer, and establishes the connection SOCKET by accepting the request (Passive-open). "TCP CLIENT" transmits connect-request to the peer to establish the connection SOCKET (Active-open). Fig 9. "TCP SERVER" & "TCP CLIENT" |
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