W5100E01-AVR WIZnet, W5100E01-AVR Datasheet - Page 77

• Manufacturer Part Number: W5100E01-AVR
• Description: Development Boards & Kits - AVR W5100 EVAL BOARD BASED ON AVR
• Manufacturer: WIZnet

Specifications of W5100E01-AVR

• Rohs: yes
• Product: Development Boards
• Tool Is For Evaluation Of: ATMEGA128
• Core: AVR8
• Interface Type: LAN, RS-232
• Operating Supply Voltage: 5 V
• Data Bus Width: 8 bit

byte decided Request/Reply, and fields after ciaddr is used to deliver network information, and options field
of 312 byte is used to transmit message type or the information such as Client Identifier.
DHCP Message of <Fig 3.26> is managed by RIP_MSG Data Type defined in <Table 3-33>. Refer to
“inet/dhcp.h”
To take a brief look at the Option Field of DHCP Message, Option Field has the format of <Fig 3.27>, it
contains Magic Cookie Field, a Lease Identification Cookie with the size of 4 Byte and Code Set ranged from
Code 0 to Code 255. From Code1 to Code 254, codes are composed of pairs of {Code, Len, Value}, and
typedef struct _RIP_MSG
{
}RIP_MSG;
u_char op;
u_char htype;
u_char hlen;
u_char hops;
u_long xid;
u_int
u_int
u_char ciaddr[4];
u_char yiaddr[4];
u_char siaddr[4];
u_char giaddr[4];
u_char chaddr[16];
u_char sname[64];
u_char file[128];
u_char OPT[312];
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secs;
flags;
<Table 3-32: DHCP Message Data Type>
<Fig 3.26: DHCP Message Format>
// DHCP_BOOTREQEUST or DHCP_BOOTREPLY
// DHCP_HTYPE10MB
// DHCP_HLENETHERNET
// DHCP_HOPS
// DHCP_XID
// DHCP_SECS
// DHCP_FLAGSBROADCAST
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