IDT1893BFILF IDT, Integrated Device Technology Inc, IDT1893BFILF Datasheet - Page 40

• Manufacturer Part Number: IDT1893BFILF
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of IDT1893BFILF

• Lead Free Status / RoHS Status: Compliant

6.4.2 100Base-TX Operation: MLT-3 Encoder/Decoder
6.4.3 100Base-TX Operation: DC Restoration
6.4.4 100Base-TX Operation: Adaptive Equalizer
6.4.5 100Base-TX Operation: Twisted-Pair Transmitter
ICS1893BF, Rev. E, 8/11/09
When operating in the 100Base-TX mode, the ICS1893BF TP-PMD sublayer employs an MLT-3 encoder
and decoder. During data transmission, the TP-PMD encoder converts the NRZI bit stream received from
the PMA sublayer to a 3-level Multi-Level Transition code. The three levels are -1, 0, and +1. The results of
MLT-3 encoding provide a reduction in the transmitted energy over the critical frequency range from 20
MHz to 100 MHz. The TP-PMD MLT-3 decoder converts the received three-level signal back to an NRZI bit
stream.
The ICS1893BF’s 100Base-TX operations uses a stream-cipher scrambler to minimize peak amplitudes in
the frequency spectrum. However, the nature of the stream cipher and MLT-3 encoding is such that long
sequences of consecutive zeros or ones can exist. These unbalanced data patterns produce an
undesirable DC component in the data stream known as ‘baseline wander’.
Baseline wander adversely affects the noise immunity of the receiver, because the ‘baseline’ signal moves
or ‘wanders’ from its nominal DC value. The ICS1893BF uses a unique technique to restore the DC
component ‘lost’ by the medium. As a result, the design is very robust, immune to noise and independent
of the data stream.
The ICS1893BF has a TP-PMD sublayer that uses adaptive equalization circuitry to compensate for signal
amplitude and phase distortion incurred from the transmission medium. At a data rate of 100 Mbps, the
transmission medium (that is, the cable) introduces significant signal distortion because of high-frequency
attenuation and phase shift. The high-frequency loss occurs primarily because of the cable skin effect that
causes the conductor resistance to rise as the square of the frequency rises.
The ICS1893BF has an adaptive equalizer that accurately compensates for these losses in shielded
twisted-pair (STP) and unshielded twisted-pair (UTP) cables. The DSP-based adaptive equalizer uses a
technique that compensates for a wide range of cable lengths. The optimizing parameter for the
equalization process is the overall bit error rate of the ICS1893BF. This technique closes the loop on the
entire data reception process and provides a very high overall reliability.
The ICS1893BF uses the same Twisted-Pair Transmit pins (TP_TXP and TP_TXN) for both 10Base-T and
100Base-TX operations. Each twisted-pair transmitter module is a current-driven, differential driver that can
supply either of the following:
•
•
The ICS1893BF interfaces with the medium through an isolation transformer (sometimes referred to as a
magnetic module). The ICS1893BF’s transmitter uses wave-shaping techniques to control the output
signal rise and fall times (thereby eliminating the need for external filters) and interfaces directly to the
isolation transformer.
Note:
1. In reference to the ICS1893BF, the term ‘Twisted-Pair Transmitter’ refers to the set of Twisted-Pair
2. For information on the 10Base-T Twisted-Pair Transmitter, see
A two-level 10Base-T (that is, Manchester-encoded) signal
A three-level 100Base-TX (that is, MLT-3 encoded) signal
Transmit output pins (TP_TXP and TP_TXN).
Twisted-Pair
ICS1893BF Data Sheet - Release
Transmitter”.
Copyright © 2009, IDT, Inc.
All rights reserved.
40
Section 6.5.11, “10Base-T Operation:
Chapter 6 Functional Blocks
August, 2009