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| 型號(hào)： | E-1110 |
| 英文描述： | E-1110 10/100/1000 Mbits/s Ethernet MAC preliminary technical manual 4/01 |
| 中文描述： | 電子1110 10/100/1000 Mbits /秒以太網(wǎng)MAC初步的技術(shù)手冊(cè)4 / 01 |
| 文件頁(yè)數(shù)： | 36/108頁(yè) |
| 文件大?。?/td> | 577K |
| 代理商： | E-1110 |
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E-1110 Core Functional Description
2-23
2.1.6.2 Host Frame Structure Support Requirement.
The E-1110 MAC host frame structure consists of the following elds:
Destination Address
Source Address
Type/Length
LLC Data
This structure is maintained in the E-1110 MAC host transmit function
interface and the host receive function interface. The Gigabit MAC’s host
frame structure is shown in Table 2.1.
The IEEE 802.3 standard requires padding of host frames to provide a
minimum frame length of 60 bytes at the host interface (64 bytes at the
media, including the FCS). The frame length is the sum of the lengths of
the destination address eld, source address eld, type/length eld, and
LLC data eld. The MAC’s transmit function pads host frames of less
than 60 bytes. Arbitrary pad bytes (typically zeroes) are added after the
LLC data eld so that the minimum frame size of 60 bytes is maintained,
not counting the four byte FCS sequence. The MAC transmit function,
when enabled, automatically performs the padding function. The result is
that the host may present frames to the MAC with LLC data elds as
small as one byte for successful transmission. The minimum frame size
Table 2.2
E-1110 MAC Host Frame Structure
Frame Field
Size Min
Size Max
Destination
Address (DA)
6 Octets
Source Address
(SA)
6 Octets
Type/Length
2 Octets
LLC Data
46 Octets
1500 Octets/9,982 Octets for HUGE Mode
Frame Check
Sequence (FCS)
4 Octets
Total
64 Octets
1518 Octets/9,000 Octets for HUGE Mode
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