ICS1893CF datasheet(85/127 Pages) IDT

85 / 127 page

Chapter 8 Pin Diagram, Listings, and Descriptions

ICS1893CF, Rev. J, 08/11/09

August, 2009

ICS1893CF Data Sheet Rev. J - Release

8.2.1 Transformer Interface Pins

Transformer connections on the ICS1893CF signals TP_AP, TP_AN, TP_BP and TP_BN are shown in

Table 8.4. The previous TP_CT pin on the ICS1893AF is not used with the ICS1893CF. The typical Twisted

Pair Transformers connections are shown in Chapter 5. The transformer must be 1:1 ratio and symetrical

for 10/100 MDI/MDIX applications since the transmit twisted pair and receive twisted pair are

interchangeable. ICS1893 PHYs do not have power connections to the transformer. All transformer power

is supplied by the ICS1893. Note the twisted pair are polarity sensitive and must connect to the RJ45 with

the same polarity as shown in the figure.

Table 8-4 lists the pins for the transformer interface group of pins.

8.2.2 Multi-Function (Multiplexed) Pins: PHY Address and LED Pins

Table 8-5 lists the pins for the multi-function group of pins (that is, the multiplexed PHY Address / LED pins).

Note:

1. During either a power-on reset or a hardware reset, each multi-function configuration pin is an input

that is sampled when the ICS1893CF exits the reset state. After sampling is complete, these pins are

output pins that can drive status LEDs.

2. A software reset does not affect the state of a multi-function configuration pin. During a software reset,

all multi-function configuration pins are outputs.

3. Each multi-function configuration pin must be pulled either up or down with a resistor to establish the

address of the ICS1893CF. LEDs placed in series with these resistors provide a designated status

indicator.

Caution:

All pins listed in Table 8-5 must not float.

4. As outputs, the asserted state of a multi-function configuration pin is the inverse of the sense sampled

during reset. This inversion provides a signal that can illuminate an LED during an asserted state. For

example, if a multi-function configuration pin is pulled down to ground through an LED and a

current-limiting resistor, then the sampled sense of the input is low. To illuminate an LED for the

asserted state requires the output to be high.

REF_IN

Frequency Reference Input: 25 MHz Input Clock or Crystal

REF_OUT

Frequency Reference Output for Crystal

RESETn

System Reset (active low)

Table 8-4. ICS1893CF Transformer Interface Pins

Signal Name

Pin No.

Signal Description

TP_AP

Twisted Pair A Positive

TP_AN

Twisted Pair A Negative

TP_BP

Twisted Pair B Positive

TP_BN

Twisted Pair B Negative

Table 8-3. ICS1893CF Configuration Pins

Signal Name

Pin No.

Signal Description

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