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| 型号： | WJLXT972ALC.A4-857345 |
| 厂商： | CORTINA SYSTEMS INC |
| 元件分类： | 网络接口 |
| 英文描述： | DATACOM, ETHERNET TRANSCEIVER, PQFP64 |
| 封装： | 10 X 10 MM, 1.40 MM HEIGHT, ROHS COMPLIANT, LQFP-64 |
| 文件页数： | 29/80页 |
| 文件大小： | 931K |
| 代理商： | WJLXT972ALC.A4-857345 |
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Page 35
Cortina Systems LXT972A Single-Port 10/100 Mbps PHY Transceiver
LXT972A PHY
Datasheet
249186, Revision 5.2
13 September 2007
5.7 100 Mbps Operation
5.7
100 Mbps Operation
5.7.1
100BASE-X Network Operations
During 100BASE-X operation, the LXT972A PHY transmits and receives 5-bit symbols
across the network link.
Figure 11 shows the structure of a standard frame packet in 100BASE-X mode. When the
MAC is not actively transmitting data, the LXT972A PHY sends out Idle symbols on the
line.
As Figure 11 shows, the MAC starts each transmission with a preamble pattern. As soon
as the LXT972A PHY detects the start of preamble, it transmits a Start-of-Stream Delimiter
(SSD, symbols J and K) to the network. It then encodes and transmits the rest of the
packet, including the balance of the preamble, the SFD, packet data, and CRC.
Once the packet ends, the LXT972A PHY transmits the End-of-Stream Delimiter (ESD,
symbols T and R) and then returns to transmitting Idle symbols.
For details on the symbols used, see 4B/5B coding listed in Table 15, 4B/5B Coding, on
As shown in Figure 12, in 100BASE-TX mode, the LXT972A PHY scrambles and
transmits the data to the network using MLT-3 line code. MLT-3 signals received from the
network are de-scrambled, decoded, and sent across the MII to the MAC.
Figure 11
100BASE-X Frame Format
P0
P1
P6
SFD
64-Bit Preamble
(8 Octets)
Start-of-Frame
Delimiter (SFD)
DA
SA
Destination and Source
Address (6 Octets each)
L1
L2
Packet Length
(2 Octets)
D0
D1
Dn
Data Field
(Pad to minimum packet size)
Frame Check Field
(4 Octets)
CRC
I0
InterFrame Gap / Idle Code
(> 12 Octets)
Replaced by
/T/R/ code-groups
End-of-Stream Delimiter (ESD)
IFG
Replaced by
/J/K/ code-groups
Start-of-Stream
Delimiter (SSD)
B3466-01
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| WJLXT971ALC.A4SE000 | DATACOM, ETHERNET TRANSCEIVER, PQFP64 |
| WJLXT971ALC.A4SE001 | DATACOM, ETHERNET TRANSCEIVER, PQFP64 |
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