ICS1892 Datasheet, PDF (108/148 Pages) Integrated Circuit Systems – 10Base-T/100Base-TX Integrated PHYceiver

ICS1892 Data Sheet
Chapter 9 Pin Diagram, Listings, and Descriptions
Table 9-5. Configuration Pins (Continued)
Pin
Name
Pin
Pin
Number Type
Pin Description
REF_IN
53
Input (Frequency) Reference Input.
This pin can be connected to either of the following frequency
reference sources:
• A 25-MHz crystal
• A 25-MHz oscillator
For the tolerance of the clock that is used, see Section 10.5.1, “Timing
for Clock Reference In (REF_IN) Pin”.
REF_OUT
52
Input
(Frequency) Reference Output.
When the frequency reference source used is a:
• A 25-MHz crystal, this pin is used in combination with the REF_IN
pin.
• A 25-MHz oscillator, this pin is left unconnected.
RESET*
22
Input (System) Reset (Active Low).
• When the signal on this active-low pin is logic:
– Low, the ICS1892 is in hardware reset.
– High, the ICS1892 is operational.
• For more information on hardware resets, see the following:
– Section 5.1.2.1, “Hardware Reset”
– Section 10.5.17, “Reset: Hardware Reset and Power-Down”
ICS1892, Rev. D, 2/26/01
© 2000-2001, Integrated Circuit Systems, Inc.
All rights reserved.
108
February 26, 2001