WJLXT971ALE.A4-857346 Cortina Systems Inc, WJLXT971ALE.A4-857346 Datasheet - Page 42

• Manufacturer Part Number: WJLXT971ALE.A4-857346
• Manufacturer: Cortina Systems Inc

Specifications of WJLXT971ALE.A4-857346

• Lead Free Status / RoHS Status: Compliant

LXT971A PHY
Datasheet
249414, Revision 5.2
13 September 2007
5.7
5.7.1
Figure 14
Cortina Systems
100 Mbps Operation
100BASE-X Network Operations
During 100BASE-X operation, the LXT971A PHY transmits and receives 5-bit symbols
across the network link.
Figure 14
MAC is not actively transmitting data, the LXT971A PHY sends out Idle symbols on the
line.
As
as the LXT971A 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 LXT971A 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
LXT971A Single-Port 10/100 Mbps PHY Transceiver
Figure 14
46.
64-Bit Preamble
P1
(8 Octets)
shows the structure of a standard frame packet in 100BASE-X mode. When the
P6
Figure 15,
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 LXT971A 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 15, 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
Page 42