ICS1892Y-10 datasheet(105/148 Pages) ICST

105 / 148 page

Chapter 9

Pin Diagram, Listings, and Descriptions

ICS1892, Rev. D, 2/26/01

February 26, 2001

105

ICS1892

9.2.2

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

Table 9-4 lists the pins for the multifunction group of pins (that is, the multiplexed PHY Address / LED pins).

Note:

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

that is sampled when the ICS1892 exists the reset state. After sampling is complete, these pins are

output pins that can drive status LEDs.

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.

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

address of the ICS1892. LEDs placed in series with these resistors provide a designated status

indicator.

Caution:

All pins listed inTable 9.4 must not float.

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.

Caution:

PHY Address 00 will tri-state the MII interface.

Note:

Each of these pins monitor the data link by providing signals that directly drive LEDs.

Table 9-4.

PHY Address and LED Pins

Name

Number

Type

Pin Description

P0AC,

P1CL,

P2LI,

P3TD,

P4RD

58,

59,

60,

61,

Input or

Output

PHY (Address Bit) 0 / Activity LED.

PHY (Address Bit) 1 / Collision LED.

PHY (Address Bit) 2 / Link Integrity LED.

PHY (Address Bit) 3 / Transmit Data LED.

PHY (Address Bit) 4 / Receive Data LED.

The ‘Pin Type’ for these multiplexed pins depends on the where the

ICS1892 is in its reset cycle.

• During a reset of the ICS1892, these pins act as inputs.

• After a reset of the ICS1892, these pins latch the state of the inputs into

their respective PHY Address bits. (See Table 8-16.) The ICS1892 then

converts the pin signal to an output that can drive the respective LED

directly.

For more information, see Section 6.9, “Status Interface”.

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