ICS1893Y-10LFT IDT, Integrated Device Technology Inc, ICS1893Y-10LFT Datasheet - Page 48
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ICS1893Y-10LFT
Manufacturer Part Number
ICS1893Y-10LFT
Description
PHYCEIVER LOW PWR 3.3V 64-TQFP
Manufacturer
IDT, Integrated Device Technology Inc
Series
PHYceiver™r
Type
PHY Transceiverr
Specifications of ICS1893Y-10LFT
Protocol
MII
Voltage - Supply
3.14 V ~ 3.47 V
Mounting Type
Surface Mount
Package / Case
64-TQFP, 64-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Number Of Drivers/receivers
-
Lead Free Status / RoHS Status
Compliant, Lead free / RoHS Compliant
Other names
1893Y-10LFT
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ICS1893Y-10LFT
Manufacturer:
IDT, Integrated Device Technology Inc
Quantity:
10 000
7.4 Functional Block: 100Base-TX TP-PMD Operations
7.4.1 100Base-TX Operation: Stream Cipher Scrambler/Descrambler
7.4.2 100Base-TX Operation: MLT-3 Encoder/Decoder
7.4.3 100Base-TX Operation: DC Restoration
ICS1893 Rev C 6/6/00
The ICS1893 supports both 10Base-T and 100Base-TX operations. For 100Base-TX operations, the
TP-PMD module performs stream-cipher scrambling/descrambling and MLT-3 encoding/decoding (3-level,
multi-level transition) in compliance with the ANSI Standard X3.263: 199X FDDI TP-PMD as defined in the
specification for 100Base-TX Twisted-Pair Physical Media Dependent (TP-PMD) Sublayer. The ICS1893’ s
TP-PMD also performs DC restoration (that is, baseline wander correction) and adaptive equalization on
the received signals.
Note:
1. For an overview of 100Base-TX operations, see
2. For more information on the Twisted-Pair Interface, see
When the ICS1893 is operating in 100Base-TX mode, it employs a stream cipher scrambler/descrambler
that complies with the ANSI Standard X3.263: 199X FDDI TP-PMD. The purpose of the stream cipher
scrambler is to spread the transmission spectrum to minimize electromagnetic compatibility problems. The
stream cipher descrambler restores the received serial bit stream to its unscrambled form.
The ICS1893 “ seeds” (that is, initializes) the Transmit Stream Cipher Shift register by using the ICS1893
PHY address from
The MAC/Repeater Interface bypasses the stream cipher scrambler/descrambler when in the 100M
Symbol Interface mode.
When operating in the 100Base-TX mode, the ICS1893 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 ICS1893’ 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 ICS1893 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.
ICS1893 Data Sheet - Release
Table
8-16, which minimizes crosstalk and noise in repeater applications.
Copyright © 2000, Integrated Circuit Systems, Inc.
All rights reserved.
48
Section 5.5, “ 100Base-TX Operations”
Section 6.5, “ Twisted-Pair Interface”
Chapter 7 Functional Blocks
.
June, 2000
.