FLLXT1000BA.C4QE000 Intel, FLLXT1000BA.C4QE000 Datasheet - Page 58

• Manufacturer Part Number: FLLXT1000BA.C4QE000
• Manufacturer: Intel

Specifications of FLLXT1000BA.C4QE000

• Lead Free Status / RoHS Status: Not Compliant

LXT1000 — Gigabit Ethernet Transceiver
2.6.2
2.6.2.1
2.6.2.2
58
Figure 32. Protocol Sublayers and Associated Functions
Digital Functions
4B/5B Encoder
The 4B/5B encoder translates 4B data nibbles to one of 32 5B symbols. Of the 32 5B symbols, 16
are used to represent data and 6 are used for control. The other 10 symbols are unused and are
considered “invalid”. 100BASE-TX data flow is shown as
Coding” on page
Scrambler
The scrambler is an 11-bit Linear Feedback Shift Register (LFSR). It creates a random pattern that
is “XORed” with the data before it is transmitted. The scrambler randomizes the data and reduces
harmonics to improve EMI performance. The receiver automatically detects the seed for the
descrambler from the transmitted pattern assuming that scrambled idle was transmitted. Thus an
inter-packet gap is all that is required for the descrambler to initially lock. Once locked, the
descrambler remains locked as long as it receives at least 12 Idle symbols within 2 ms.
Sublayer
Sublayer
Sublayer
PMA
PMD
PCS
60.
MLT3 Encoder/Decoder
Link/Carrier Detector
Analog Functions
Encoder/Decoder
De-scrambler
Scrambler/
4B/5B
100BASE-TX
MII Interface
Figure 34 on page
60. See
Document #: 249276
Rev. Date: 07/20/01
“4B/5B
Revision #: 002
Datasheet