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RabbitCore RCM3900 User’s Manual

6.2.2 How IP Addresses are Used

The actual hardware connection via an Ethernet uses Ethernet adapter addresses (also

called MAC addresses). These are 48-bit addresses and are unique for every Ethernet

adapter manufactured. In order to send a packet to another computer, given the IP address

of the other computer, it is first determined if the packet needs to be sent directly to the

other computer or to the gateway. In either case, there is an Ethernet address on the local

network to which the packet must be sent. A table is maintained to allow the protocol

driver to determine the MAC address corresponding to a particular IP address. If the table

is empty, the MAC address is determined by sending an Ethernet broadcast packet to all

devices on the local network asking the device with the desired IP address to answer with

its MAC address. In this way, the table entry can be filled in. If no device answers, then

the device is nonexistent or inoperative, and the packet cannot be sent.

Some IP address ranges are reserved for use on internal networks, and can be allocated

freely as long as no two internal hosts have the same IP address. These internal IP

addresses are not routed to the Internet, and any internal hosts using one of these reserved

IP addresses cannot communicate on the external Internet without being connected to a

host that has a valid Internet IP address. The host would either translate the data, or it

would act as a proxy.

Each RCM3900 RabbitCore module has its own unique MAC address, which consists of

the prefix 0090C2 followed by a code that is unique to each RCM3900 module. For exam-

ple, a MAC address might be 0090C2C002C0.

TIP: You can always obtain the MAC address on your board by running the sample pro-

gram DISPLAY_MAC.C from the SAMPLES\TCPIP folder.

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20-101-1198	功能描述:程序設(shè)計(jì)器配件 Programmers, Development Systems Accessories - CARD EXPANSION RN1400 ROHS RoHS:否制造商:Lattice 產(chǎn)品:ispDOWNLOAD Cables 用于:In-system Programming
20-101-1200	功能描述:子卡和OEM板 UNIVERSAL RELAY EXP BOARD RoHS:否制造商:BeagleBoard by CircuitCo 產(chǎn)品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit
20-101-1201	功能描述:程序設(shè)計(jì)器配件 USB PROG CBL WITH 2MM CONN RoHS:否制造商:Lattice 產(chǎn)品:ispDOWNLOAD Cables 用于:In-system Programming
20-101-1202	功能描述:WiFi/802.11模塊 RCM4400W CORE MODULE Wi-Fi/802.11 RoHS:否制造商:Taiyo Yuden 支持協(xié)議:802.11 b/g/n 頻帶: 數(shù)據(jù)速率:150 Mbps 接口類型:SDIO 傳輸功率（最大）: 天線連接器類型: 工作電源電壓:3.4 V to 5.5 V 傳輸供電電流: 接收供電電流: 最大工作溫度:+ 80 C 尺寸:35 mm x 15 mm x 2.9 mm
20-101-1207	功能描述:Zigbee/802.15.4模塊 RF/IF and RFID RF Evaluation & Development Kits & Boards - RCM4510W FCC CERTIFIED RoHS:否制造商:Digi International 頻帶:902 MHz to 928 MHz 視線范圍: 數(shù)據(jù)速率: 靈敏度: 工作電源電壓:2.4 V to 3.6 V 傳輸供電電流:215 mA 接收供電電流:26 mA 輸出功率:250 mW 天線連接器類型:Wire 最大工作溫度:+ 85 C 尺寸:32.94 mm x 22 mm x 2.03 mm

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