MDK-ARM Keil, MDK-ARM Datasheet - Page 66

• 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

66
Chapter 4. RL-TCPnet Introduction
The IP protocol supports
message fragmentation and re-
assembly; for a small, embedded
node, this can be expensive in
terms of RAM used to buffer
messages. The IP protocol rides
within the Ethernet information
frame as shown below.
The Internet Protocol datagram
provides station-to-station
delivery of data, independent of
the physical network. It does not
provide an acknowledge or
resend mechanism.
The Internet Protocol Header contains a source and destination IP address. The
IP address is a 32-bit number that is used to uniquely identify a node within the
internet. This address is independent of the physical networking address, in our
case the Ethernet station address. In order for IP packets to reach the destination,
a discovery process is required to relate the IP address to the Ethernet station
address.
Address Resolution Protocol
The Address Resolution Protocol (ARP) is used to discover the Ethernet address
of a station on a local network and relate this to the IP address. ARP can be used
on any network that can broadcast messages. The ARP has its own datagram that
is held within the Ethernet frame.
The ARP protocol provides a
method of routing IP messages
on a LAN. It provides a
discovery method to link a
station Ethernet MAC address to
its IP address.
When a station needs to discover
the Ethernet address of a remote
station, it will transmit a
broadcast message that contains