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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
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UDP |
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IP |
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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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