SLXT973QC.A2 Intel, SLXT973QC.A2 Datasheet - Page 35
Manufacturer Part Number
Specifications of SLXT973QC.A2
Lead Free Status / RoHS Status
If the LXT973 detects a signal fault condition, it transmits the Far End Fault Indication (FEFI) over
the fiber link. The FEFI consists of 84 consecutive “1s” followed by a single “0.” This pattern must
be repeated at least three times. The LXT973 transmits the Far-End Fault code a minimum of three
times if all the following conditions are true:
Fiber mode is selected.
Far End Fault Code transmission is enabled (Register bit 16.2 = 1).
Signal Detect indicates either no signal or the receive PLL cannot lock.
Loopback is not enabled.
100 Mbps Operation
100BASE-X Network Operations
During 100BASE-X operation, the LXT973 transmits and receives 5-bit symbols across the
actively transmitting data, the LXT973 sends out IDLE symbols on the line.
In 100BASE-TX mode, the device scrambles the data and transmits it to the network using MLT-3
line code. The MLT-3 signals received from the network are de-scrambled and decoded, and sent
across the MII to the MAC.
In 100BASE-FX mode, the LXT973 transmits and receives NRZI signals across the PECL
interface. An external 100BASE-FX transceiver module is required to complete the fiber
As shown in
9, the MAC starts each transmission with a preamble pattern. As soon as the
LXT973 detects the start of preamble, it transmits a J/K Start-of-Stream Delimiter (SSD) symbol to
the network. It then encodes and transmits the rest of the packet, including the balance of the
preamble, the Start-of-Frame Delimiter (SFD), packet data, and CRC. Once the packet ends, the
LXT973 transmits the T/R End-of-Stream Delimiter (ESD) symbol and returns to transmitting
Figure 9. 100BASE-X Frame Format
Document #: 249426
Revision #: 002
Rev. Date: March 1, 2002
LXT973 10/100 Mbps Dual-Port Fast Ethernet PHY Transceiver
shows the structure of a standard frame packet. When the MAC is not
Destination and Source
Address (6 Octets each)
(Pad to minimum packet size)
Frame Check Field
InterFrame Gap / Idle Code
(> 12 Octets)
End-of-Stream Delimiter (ESD)