MDK-ARM Keil, MDK-ARM Datasheet - Page 65

• Manufacturer Part Number: MDK-ARM
• Description: KIT REALVIEW MCU DEVELOPMENT
• Manufacturer: Keil
• Type: Compiler and IDEr

Specifications of MDK-ARM

• For Use With/related Products: ARM MCUs
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Getting Started: Building Applications with RL-ARM
65
Ethernet and IEEE 802.3
Today’s most dominant networking transport layer for local area networks is
Ethernet (or rather Ethernet II to be exact). The Ethernet header contains a
synchronization preamble, followed by source and destination addresses and a
length field to denote the size of the data packet.
The Ethernet data frame is the transport mechanism for TCP\IP data over a Local
Area Network.
The data in the information field must be between 46 and 1500 octets long. The
final field in the data packed is the Frame Check Sequence, which is a Cyclic
Redundancy Check (CRC). This CRC provides error checking over the packet
from the start of the destination address field to the end of the information field.
TCP/IP Datagrams
In Ethernet networks, the Ethernet data packet is used as the physical
transmission medium and several protocols may be carried in the information
section of the Ethernet packet. For sending and receiving data between nodes,
the information section of the Ethernet packet contains a TCP/IP datagram.
The Layer2 frame (Ethernet) encapsulates the TCP/IP datagrams.
Internet Protocol
The Internet Protocol is the basic transmission datagram of the TCP/IP suite. It
is used to transfer data between two logical IP addresses. On its own, it is a best-
effort delivery system. This means that IP packets may be lost, may arrive out of
sequence, or may be duplicated.
There is no acknowledgement to the sending station and no flow control. The IP
protocol provides the transport mechanism for sending data between two nodes
on a TCP/IP network.