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| 型號： | 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4 / 01 |
| 文件頁數(shù)： | 18/108頁 |
| 文件大?。?/td> | 577K |
| 代理商： | E-1110 |
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E-1110 Core Functional Description
2-7
Interframe Spacing. The Gigabit MAC interframe spacing function
complies with the IEEE 802.3 standard. The interframe gap is
required to allow the proper recovery time between frames for
physical layer components and the medium. The Gigabit MAC
supports the basic back-to-back transmit interframe gap (IFG). The
IEEE 802.3 standard requires an interframe gap of 0.096
sfor
back-to-back transmits.
Collision Handling and Slot Time. The transmit function operates in
full-duplex mode, which means it does not defer to the CRS signal
and does not respond to the COL signal.
Collision Detection and Enforcement. Not supported because the
Gigabit MAC operates in the full-duplex mode.
Collision Back Off and Retransmission. Not supported because the
Gigabit MAC operates in the full-duplex mode.
Minimum Frame Size and Padding – The Gigabit MAC minimum
frame size and padding function complies with the IEEE 802.3 standard.
The carrier sense multiple access collision detect (CSMA/CD) media
access protocol for shared media requires that a minimum frame size be
enforced. Host frames that are presented to the Gigabit MAC with a
length of less than the minimum frame size in bits are optionally padded
with bytes of arbitrary data to produce a frame of the minimum required
length. The padding is appended after the LLC data eld but prior to the
calculation and appending of the FCS. The number of bytes of padding
must be sufcient to ensure that the frame as counted from the
destination address eld through the FCS eld inclusive be of at least the
minimum frame size in bits. The IEEE 802.3 standard requires that the
minimum frame size parameter be set to 64 bytes (512 bits). The
padding option is turned on when the MTX_APPEND_CRC signal is
asserted.
Preamble Generation and Start Of Frame Sequence – The Gigabit
MAC preamble generation and start of frame sequence functions comply
with the IEEE 802.3 standard. The Gigabit MAC upon request from the
host, transmits a preamble and start of frame sequence that complies
with the IEEE 802.3 standard. The preamble and start of frame
sequence is designed to allow the physical layer (PHY) circuitry at
receiving stations to acquire both bit and symbol level synchronization to
the receive data stream. The preamble length and whether the preamble
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