ICS1893AF Data Sheet - Release
Chapter 9 Pin Diagram, Listings, and Descriptions
9.2.3 Configuration Pins
Table 9-7 lists the configuration pins.
Table 9-7. Configuration Pins
Pin
Pin
Pin
Pin Description
Name
Number
Type
10/100SEL
9
Output 10Base-T / 100Base-TX Select.
• This pin acts as an output that indicates the current status of this
pin. In this case, when the signal on this pin is logic:
– Low, this pin indicates 10Base-T operations are selected.
– High, this pin indicates 100Base-TX operations are selected.
10TCSR
15
16
Input
Input
10M Transmit Current Set Resistor.
• A resistor, connected between this pin and ground, is required to
establish the value of the transmit current used in 10Base-T mode.
• The value and tolerance of this resistor is specified in Section 10.3,
“Recommended Component Values”.
100TCSR
100M Transmit Current Set Resistor.
• A resistor, connected between this pin and ground, is required to
establish the value of the transmit current used in 100Base-TX
mode.
• The value and tolerance of this resistor is specified in Section 10.3,
“Recommended Component Values”.
REF_IN
47
Input
(Frequency) Reference Input.
This pin is connected to a 25-MHz oscillator. For a tolerance, see
Section 10.5.1, “Timing for Clock Reference In (REF_IN) Pin”.
REF_OUT
RESETn
46
22
Output (Frequency) Reference Output.
This pin is used with a crystal.
Input
(System) Reset (Active Low).
• When the signal on this active-low pin is logic:
– Low, the ICS1893AF is in hardware reset.
– High, the ICS1893AF is operational.
• For more information on hardware resets, see the following:
– Section 5.1.2.1, “Hardware Reset”
– Section 10.5.16, “Reset: Hardware Reset and Power-Down”
ICS1893AF, Rev D 10/26/04
October, 2004
Copyright © 2004, Integrated Circuit Systems, Inc.
All rights reserved.
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