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參數(shù)資料
| 型號(hào)： | 84302 |
| 廠商： | LSI Corporation |
| 英文描述： | 4-Port Fast Ethernet Controller( 4端口快速以太網(wǎng)控制器) |
| 中文描述： | 4端口快速以太網(wǎng)控制器（4端口快速以太網(wǎng)控制器） |
| 文件頁(yè)數(shù)： | 13/96頁(yè) |
| 文件大?。?/td> | 826K |
| 代理商： | 84302 |
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84302 4-Port
Fast Ethernet Controller
4-13
MD400171/C
Figure 3. Ethernet MAC Frame Format
Destination Address
The destination address is a 48-bit field containing the
address of the station(s) to which the frame is directed.
The format of the address field is the same as defined in
IEEE 802.3 and shown in Figure 3b. The destination
address can be either a unicast address to a specific
station, a multicast address to a group of stations, or a
broadcast address to all stations. The first and second bits
determine whether an address is unicast, multicast or
broadcast, and the remaining 46-bits are the actual
address bits, as shown in Figure 3b.
Source Address
The source address s a 48-bit field containing the specific
station address from which the frame originated. The
format of the address field is the same as defined in IEEE
802.3 and shown in Figure 3b.
Length/Type Field
The 16-bit length/type field takes on the meaning of either
packet length or packet type, depending on its numeric
value, as described in Table 1.
Table 1. Length/Type Field Definition
Length/Type
Field Value
(Decimal)
Length
or Type
Definition
0-1500
Length
Total Number of Bytes
In Data Field Minus
any Padding.
1501-1517
Neither
Undefined
>=1518
Type
Frame Type
a. FRAME FORMAT
7 BYTES
1 BYTES
6 BYTES
6 BYTES
2 BYTES
46 - 1500 BYTES
4 BYTES
PREAMBLE
START OF FRAME
DELIMITER (SFD)
DESTINATION
ADDRESS (DA)
SOURCE
ADDRESS (SA)
LENGHT/TYPE (L/T)
DATA
FRAME CHECK
SEQUENCE (FCS)
A0
LSB
A7
MSB
BITS WITHIN
FRAME TRANSMITTED
LEFT - TO - RIGHT
BYTES WITHIN
FRAME TRANSMITTED
TOP - TO - BOTTOM
SEE
BELOW
b. ADDRESS FIELD FORMAT
I/G
46 - BIT ADDRESS
U/L
1 = MULTICAST OR BROADCAST
0 = UNICAST
1 = BROADCAST
0 = MULTICAST
A0
A47
BITS IN
STATION ADDRESS 0-5 REGISTERS
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