WJLXT972MLC.A4-864115 Cortina Systems Inc, WJLXT972MLC.A4-864115 Datasheet - Page 35

• Manufacturer Part Number: WJLXT972MLC.A4-864115
• Description: TXRX ETH 10/100 SGL PORT 48-LQFP
• Manufacturer: Cortina Systems Inc

Specifications of WJLXT972MLC.A4-864115

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 1008-1044

LXT972M PHY
Datasheet
302875, Revision 5.2
13 September 2007
5.7
5.7.1
Figure 11
Cortina Systems
100 Mbps Operation
100BASE-X Network Operations
During 100BASE-X operation, the LXT972M PHY transmits and receives 5-bit symbols
across the network link.
Figure 11
MAC is not actively transmitting data, the LXT972M PHY sends out Idle symbols on the
line.
As
as the LXT972M 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 LXT972M 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
page
100BASE-X Frame Format
As shown in
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.
®
Replaced by
/J/K/ code-groups
Start-of-Stream
Delimiter (SSD)
P0
LXT972M Single-Port 10/100 Mbps PHY Transceiver
Figure 11
39.
64-Bit Preamble
P1
(8 Octets)
shows the structure of a standard frame packet in 100BASE-X mode. When the
P6
Figure 12,
shows, the MAC starts each transmission with a preamble pattern. As soon
Delimiter (SFD)
Start-of-Frame
SFD
DA
Address (6 Octets each)
in 100BASE-TX mode, the LXT972M PHY scrambles and
Destination and Source
DA
SA
SA
Packet Length
L1
(2 Octets)
L2
(Pad to minimum packet size)
D0
Data Field
D1
Dn
Table 16, 4B/5B Coding, on
Frame Check Field
(4 Octets)
CRC
5.7 100 Mbps Operation
End-of-Stream Delimiter (ESD)
/T/R/ code-groups
Replaced by
B3466-01
InterFrame Gap / Idle Code
I0
(> 12 Octets)
IFG
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