ICS1893AF Data Sheet - Release
Chapter 9 Pin Diagram, Listings, and Descriptions
Table 9-4. Configuration Pins
Signal Name
10/100
Pin No.
9
Signal Description
Output Indication, High=100baseTX Operation
100TCSR
10TCSR
REFIN
16
100M Transmit Current Set Resistors (See Figure X)
10M Transmit Current Set Resistor
15
47
Frequency Reference Input: 25 MHz Input Clock or Crystal
Frequency Reference Output for Crystal
System Reset (active low)
RFOUT
46
RESETn
22
9.2.1 Transformer Interface Pins
The tables in this section list the ICS1893AF pins by their functional grouping.
Table 9-5 lists the pins for the transformer interface group of pins.
Table 9-5. Transformer Interface Pins
Pin
Pin
Pin
Pin Description
Name
Number
Type
TP_RXN
TP_RXP
19
18
Input
Input
Twisted-Pair Receive (Data) Negative.
Within this table, see the description at the TP_RXP pin.
Twisted-Pair Receive (Data) Positive.
Data reception of differential analog signals occurs over the TP_RXN
and TP_RXP pair of differential-signal pins. Together these pins receive
the serial bit stream from the UTP cable through an isolation
transformer.
Depending on the operating mode of the remote link partner, the
received data is one of the following types of signals:
• Two-level 10Base-T (that is, Manchester-encoded) signals
• Three-level 100Base-TX, (that is, MLT-3 encoded) signals
The TP_RXN and TP_RXP pins interface directly to an isolation
transformer, which in turn, interfaces with the UTP cable.
TP_TXN
TP_TXP
13
12
Output Twisted-Pair Transmit (Data) Negative.
Within this table, see the description at the TP_TXP pin.
Output Twisted-Pair Transmit (Data) Positive.
Differential analog signal transmission occurs over the TP_TXN and
TP_TXP pair of pins. Together these pins drive the serial bit stream
over the UTP cable.
Depending on the operating mode of the ICS1893AF MDI, the
current-driven differential driver produces one of the following types of
signals:
• Two-level 10Base-T (that is, Manchester-encoded) signals
• Three-level 100Base-T (that is, MLT-3 encoded) signals
The TP_RXN and TP_RXP pins interface directly to an isolation
transformer, which in turn, drives the UTP cable.
ICS1893AF, Rev D 10/26/04
October, 2004
Copyright © 2004, Integrated Circuit Systems, Inc.
All rights reserved.
100
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
