FLLXT1000BA.C4QE000 Intel, FLLXT1000BA.C4QE000 Datasheet - Page 49

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

Specifications of FLLXT1000BA.C4QE000

• Lead Free Status / RoHS Status: Not Compliant

2.5.2.7
2.5.2.8
2.5.2.9
2.5.2.10
Datasheet
Document #: 249276
Revision #: 002
Rev. Date: 07/20/01
Figure 19. 1000BASE-T Transmit Flow and Line Coding Scheme
2.5.2.10.1 Scrambler Polynomials:
1 + x
1 + x
GMII
D0
D1
D2
D3
D4
D5
D6
D7
13
20
Spectral Shaper
This function causes the 4DPAM5 waveform to have a spectral signature that is very close to that
of the MLT3 waveform used by 100BASE-TX. This allows 1000BASE-T to take advantage of
infrastructure (cables, magnetics) designed for 100BASE-TX.
The shaper works by transmitting 75% of a 4DPAM5 code in the current baud period, and adding
the remaining 25% into the next baud period.
Low-Pass Filter
To aid with EMI, this filter attenuates signal components more than 180 MHz. In 1000BASE-T, the
fundamental symbol rate is 125 MHz.
Line Driver
The line driver drives the 4DPAM5 waveforms onto the four twisted-pair channels (A, B, C, D),
adding them onto the waveforms that are simultaneously being received from the link partner.
Transmit/Receive Flow
+ x
+ x
33
33
(Master PHY Mode)
(Slave PHY Mode)
Scrambler
8
Encoder
Trellis
9
Gigabit Ethernet Transceiver — LXT1000
PAM-5
4D
to 4-Pair UTP Line
Encoded Output
PAM-5
49