ICS1892 Datasheet, PDF (106/148 Pages) Integrated Circuit Systems – 10Base-T/100Base-TX Integrated PHYceiver

ICS1892 Data Sheet
Chapter 9 Pin Diagram, Listings, and Descriptions
9.2.3 Configuration Pins
Table 9-5 lists the configuration pins.
Table 9-5. Configuration Pins
Pin
Name
10/100SEL
10/LP
10TCSR
100TCSR
ANSEL
Pin
Number
2
28
3
4
64
Pin
Type
Input or
Output
Input
Input
Input
Input or
Output
Pin Description
10Base-T / 100Base-TX Select.
The ‘Pin Type’ for this pin depends on the setting for the HW/SW pin
(pin 23). When the HW/SW pin is set for:
• Hardware mode, this pin acts as an input. In this case, when the
signal on this pin is logic:
– Low, this pin selects 10Base-T operations.
– High, this pin selects 100Base-TX operations.
• Software mode, 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.
10M Serial / Link Pulse (Stream Interface).
• For this pin to have any affect on the MAC/Repeater Interface:
– The 10/100SEL pin must be logic zero (that is, 10-MHz mode).
– The MII/SI pin must be logic one (that is, Stream Interface mode).
• When both the 10/100 SEL and MII/SI pins are set as required,
then this 10/LP pin selects between the 10M Serial Interface and
the Link Pulse Interface for the MAC/Repeater Interface. When the
signal on this pin is logic:
– Low, this pin selects the 10M Serial Interface.
– High, this pin selects the Link Pulse Interface.
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”.
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”.
Auto-Negotiation Select.
The ‘Pin Type’ for this pin depends on the setting for the HW/SW pin
(pin 23). When the HW/SW pin is set for:
• Hardware mode, this pin acts as an input. In this case, when the
signal on this pin is logic:
– Low, this pin does not select Auto-Negotiation operations.
– High, this pin selects Auto-Negotiation operations.
• Software mode, 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 that Auto-Negotiation is disabled.
– High, this pin indicates that Auto-Negotiation is enabled.
ICS1892, Rev. D, 2/26/01
© 2000-2001, Integrated Circuit Systems, Inc.
All rights reserved.
106
February 26, 2001