W6100 datasheet(85/149 Pages) WIZNET

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W6100 – Hardwired Dual TCP/IP Stack Controller

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Sn_TX_BSR = 2; // assign 2 Kbytes TX buffer per SOCKET

Sn_RX_BSR = 2; // assign 2 Kbytes RX buffer per SOCKET

TxTotalSize = TxTotalSize + Sn_TX_BSR;

RxTotalSize = RxTotalSize + Sn_RX_BSR;

If( TxTotalSize > 16 or RxTotalSize > 16 ) goto ERROR; // invalid Total Size

} // end for

}

6.2

TCP

TCP (Transmission Control Protocol) is a bidirectional data transmission protocol based on a 1:1

connection-oriented communication in the transport layer. TCP provides communication

between applications which are designated by a port number.

TCP 1:1 communication needs the connection process such as transmitting connection request

to peer or receiving connection request from peer. In this connection process, the side

transmitting connection request is called ‘TCP CLIENT’ and the other side receiving connection

request is called ‘TCP SERVER.’ TCP provides reliable, ordered, and error-checked delivery of

a stream data between peer systems. 'TCP SERVER' and 'TCP CLIENT' keep the connection and

send / receive a data until the TCP connection is terminated.

Figure 20 TCP SERVER and TCP CLIENT

SERVER

CLIENT

SERVER

CLIENT

“

TCP SERVER”

“

TCP CLIENT”

OPEN

LISTEN

ESTABLISHED

CLOSED

OPEN

CONNECT

ESTABLISHED

CLOSED

Connect-Request

Data Communications

Disconnect-Request

Data Communications

Connect-Request

W6100 Datasheet(PDF) 85 Page - WIZnet Co., Ltd

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