ICS1892 datasheet(53/148 Pages) ICST

53 / 148 page

Chapter 7

Functional Blocks

ICS1892, Rev. D, 2/26/01

February 26, 2001

ICS1892

7.5.11

10Base-T Operation: Twisted-Pair Transmitter

For both 10Base-T and 100Base-TX operations, the ICS1892 uses the same Twisted-Pair Transmit pins

(TP_TXP and TP_TXN) as well as the same internal functional module. The twisted-pair transmitter

module is a current-driven, differential driver that can supply either of the following:

• A two-level 10Base-T (that is, Manchester-encoded) signal

• A three-level 100Base-TX (that is, MLT-3 encoded) signal

The ICS1892 interfaces with the medium through an isolation transformer. The ICS1892 transmitter uses

wave-shaping techniques to control the output signal rise and fall times (thereby eliminating the need for

expensive external filters) and interfaces directly to the isolation transformer.

Note:

In reference to the ICS1892, the term ‘Twisted-Pair Transmitter’ refers to the set of Twisted-Pair

Transmit output pins (TP_TXP and TP_TXN).

For information on the 100Base-TX Twisted-Pair Transmitter, see Section 7.4.5, “100Base-TX

Operation: Twisted-Pair Transmitter”.

7.5.12

10Base-T Operation: Twisted-Pair Receiver

Twisted-Pair Receiver operations are similar to Twister-Pair Transmitter operations, in that for both

10Base-T and 100Base-TX operations, the ICS1892 uses the same Twister-Pair Receive pins (TP_RXP

and TP_RXN).

However, unlike the transmitter operations (which use the same internal functional module), the ICS1892

employs separate internal twisted-pair receiver modules to process the incoming data: one for 10Base-T

operations and one for 100Base-TX operations. The internal twisted-pair receiver modules interface with

the medium through an isolation transformer. The 10Base-T receiver module accepts and processes a

differential two-level 10Base-T (that is, Manchester-encoded) signal from the isolation transformer.

Note:

In reference to the ICS1892, the term ‘Twisted-Pair Receiver’ refers to the set of Twisted-Pair Receive

output pins (TP_RXP and TP_RXN).

For information on the 100Base-TX Twisted-Pair Receiver, see Section 7.4.6, “100Base-TX Operation:

Twisted-Pair Receiver”.

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