ICS1893CF datasheet(89/127 Pages) IDT

89 / 127 page

Chapter 8 Pin Diagram, Listings, and Descriptions

ICS1893CF, Rev. J, 08/11/09

August, 2009

ICS1893CF Data Sheet Rev. J - Release

8.2.3 Configuration Pins

Table 8-6 lists the configuration pins.

Table 8-6. Configuration Pins

Name

Number

Type

Pin Description

10/100SEL

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

Output

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 9.3,

“Recommended Component Values *”.

100TCSR

Output

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 9.3,

“Recommended Component Values *”.

REF_IN

Input

(Frequency) Reference Input.

This pin is connected to a 25-MHz oscillator. For a tolerance, see

Section 9.5.1, “Timing for Clock Reference In (REF_IN) Pin”.

REF_OUT

Output

(Frequency) Reference Output.

This pin is used with a crystal.

RESETn

Input

(System) Reset (Active Low).

• When the signal on this active-low pin is logic:

– Low, the ICS1893CF is in hardware reset.

– High, the ICS1893CF is operational.

• For more information on hardware resets, see the following:

– Section 4.1.2.1, “Hardware Reset”

– Section 9.5.16, “Reset: Hardware Reset and Power-Down”

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