參數(shù)資料
型號： WJLXT972MLC.A4SE000
廠商： CORTINA SYSTEMS INC
元件分類： 網(wǎng)絡(luò)接口
英文描述： DATACOM, ETHERNET TRANSCEIVER, PQFP48
封裝： LEAD FREE, LQFP-48
文件頁數(shù)： 48/94頁
文件大小： 1235K
代理商： WJLXT972MLC.A4SE000
Intel
LXT972M Single-Port 10/100 Mbps PHY Transceiver
52
Document Number: 302875-004
Revision Date: February 18, 2005
5.8
10 Mbps Operation
The LXT972M Transceiver operates as a standard 10BASE-T transceiver and supports standard 10
Mbps functions. During 10BASE-T operation, the LXT972M Transceiver transmits and receives
Manchester-encoded data across the network link. When the MAC is not actively transmitting data,
the LXT972M Transceiver drives link pulses onto the line.
In 10BASE-T mode, the polynomial scrambler/de-scrambler is inactive. Manchester-encoded
signals received from the network are decoded by the LXT972M Transceiver and sent across the
MII to the MAC.
Note:
The LXT972M Transceiver does not support fiber connections.
5.8.1
10BASE-T Preamble Handling
The LXT972M Transceiver offers two options for preamble handling, selected by Register bit 16.5.
In 10BASE-T mode when Register bit 16.5 = 0, the LXT972M Transceiver strips the entire
preamble off of received packets. CRS is asserted coincident with the start of the preamble.
RX_DV is held Low for the duration of the preamble. When RX_DV is asserted, the very first
two nibbles driven by the LXT972M Transceiver are the SFD “5D” hex followed by the body
of the packet.
In 10BASE-T mode when Register bit 16.5 = 1, the LXT972M Transceiver passes the
preamble through the MII and asserts RX_DV and CRS simultaneously. (In 10BASE-T
loopback, the LXT972M Transceiver loops back whatever the MAC transmits to it, including
the preamble.)
5.8.2
10BASE-T Carrier Sense
For 10BASE-T links, CRS assertion is based on reception of valid preamble, and CRS de-assertion
is based on reception of an end-of-frame (EOF) marker. Register bit 16.7 allows CRS de-assertion
to be synchronized with RX_DV de-assertion. For details, see Table 51, “Configuration Register -
5.8.3
10BASE-T Dribble Bits
The LXT972M Transceiver handles dribble bits in all modes. If one to four dribble bits are
received, the nibble is passed across the MII, padded with ones if necessary. If five to seven
dribble bits are received, the second nibble is not sent to the MII bus.
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