Software Organization - Toshiba T2N Instruction Manual

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.
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).
T2N user program
SEND/RECV instruction
T2N firmware
Computer link/PC link/socket interface
T2N internal bus
Ethernet Port interface
UDP
IP ARP
CSMA/CD
10BASE-T
Figure 1.7 Software Organization
22
T2N Upper Protocol
software
TCP
Ethernet
ICMP
6 F 3 B 0 3 6 2
Port