ICS1894-33 datasheet(13/39 Pages) RENESAS

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ICS1894-33

10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH RMII INTERFACE

PHYCEIVER

IDT® 10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH RMII INTERFACE

ICS1894-33

REV A 021612

Pins for Monitoring the Data Link table

Note:

1. During either power-on reset or hardware reset, each

multi-function configuration pin is an input that is sampled

when the ICS1894-33 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 ICS1894-33. LEDs may be placed in series with these

resistors to provide a designated status indicator as

described in the Pins for Monitoring the Data Link table. Use

Ω resistors.

Caution: Pins listed in the Pins for Monitoring the Data Link

table 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 this LED for

the asserted state, the output is driven high.

5. Adding 10K

Ωresistors across the LEDs ensures the PHY

address is fully defined during slow VDD power-ramp

conditions.

6. PHY address 00 tri-states the RMII interface. (Do not

select PHY address 00 unless you want the RMII interface

tri-stated.)

The following figure shows typical biasing and LED connections for the ICS1894-33.

The above circuit decodes the PHY address = 1

Status Events that drive the LEDs

P0/LED0

Link, Activity, Tx, Rx, Mode, Dplx

P1/ISO/LED1

Link, Activity, Tx, Rx, Mode, Dplx

ICS1894-33

P1/ISO/LED1

P0/LED0

LED0

10K

VDD

LED1

10K

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