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1.5 Software Organization

The Ethernet Port transmission functions (computer link protocol transmission, PC link protocol transmission and socket interface transmission) are implemented with the software organization shown in the figure.

T2N user program

SEND/RECV instruction

T2N firmware

Computer link/PC link/socket interface

 

 

 

 

 

 

 

T2N internal bus

 

 

 

 

 

 

 

 

 

 

 

Ethernet Port interface

 

 

 

 

 

 

 

 

 

 

 

UDP

 

 

 

 

 

 

 

 

TCP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IP

 

 

ARP

 

 

ICMP

 

 

 

 

 

 

 

 

 

 

 

 

CSMA/CD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10BASE-T

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 1.7 Software Organization

T2N Upper Protocol software

Ethernet

Port

TCP (transmission control protocol)

Before transferring data with the remote port, a connection (virtual communication circuit) is first established and then data is transferred. Transmission reliability is guaranteed by packet order control, retransmission, flow control, and other techniques.

The Ethernet Port supports the following:

Response bit (ACK)

Push bit (PSH)

Synchronized bit (SYN)

Fin bit (FIN)

Retransferring

Window (flow) control

Segment division

Reporting of the maximum receivable segment length

The Ethernet Port does not support the reset bit (RST).

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Toshiba T2N instruction manual Software Organization, TCP transmission control protocol