ICS1892 datasheet(106/148 Pages) ICST

106 / 148 page

ICS1892, Rev. D, 2/26/01

February 26, 2001

106

Chapter 9

Pin Diagram, Listings, and Descriptions

ICS1892 Data Sheet

9.2.3

Configuration Pins

Table 9-5 lists the configuration pins.

Table 9-5.

Configuration Pins

Name

Number

Type

Pin Description

10/100SEL

Input or

Output

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.

10/LP

Input

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.

10TCSR

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

Input

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”.

ANSEL

Input or

Output

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.

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