ICS1892Y datasheet(18/148 Pages) ICST

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ICS1892, Rev. D, 2/26/01

February 26, 2001

Chapter 5

Operating Modes Overview

ICS1892 Data Sheet

5.1

Reset Operations

This section first discusses reset operations in general and then specific ways in which the ICS1892 can be

configured for various reset options.

5.1.1

General Reset Operations

The following reset operations apply to all the specific ways in which the ICS1892 can be reset, which are

discussed in Section 5.1.2, “Specific Reset Operations”.

5.1.1.1

Entering Reset

When the ICS1892 enters a reset condition (either through hardware, power-on reset, or software), it does

the following:

Isolates the MAC/Repeater Interface input pins

Drives all MAC/Repeater Interface output pins low

Tri-states the signals on its Twisted-Pair Transmit pins (TP_TXP and TP_TXN)

Initializes all its internal modules and state machines to their default states

Enters the power-down state

Initializes all internal latching low (LL), latching high (LH), and latching maximum (LMX) Management

5.1.1.2

Exiting Reset

When the ICS1892 exits a reset condition, it does the following:

Exits the power-down state

Latches the Serial Management Port Address of the ICS1892 into the Extended Control Register, bits

16.10:6. [See Section 8.11.3, “PHY Address (bits 16.10:6)”.]

Enables all its internal modules and state machines

Sets all Management Register bits to either (1) their default values or (2) the values specified by their

associated ICS1892 input pins, as determined by the HW/SW pin

Enables the Twisted-Pair Transmit pins (TP_TXP and TP_TXN)

Resynchronizes both its Transmit and Receive Phase-Locked Loops, which provide its transmit clock

(TXCLK) and receive clock (RXCLK)

Releases all MAC/Repeater Interface pins, which takes a maximum of 640 ns after the reset condition

is removed

5.1.1.3

Hot Insertion

As with the ICS 1890, the ICS1892 reset design supports ‘hot insertion’ of its MII. (That is, the ICS1892 can

connect its MAC/Repeater Interface to a MAC/repeater while power is already applied to the

MAC/repeater.)

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