ICS1893AFILF datasheet(19/137 Pages) RENESAS

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Chapter 5

Operating Modes Overview

ICS1893AF, Rev. D 10/26/04

October, 2004

ICS1893AF Data Sheet - Release

5.1

Reset Operations

This section first discusses reset operations in general and then specific ways in which the ICS1893AF 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 ICS1893AF can be reset, which

are discussed in Section 5.1.2, “Specific Reset Operations”.

5.1.1.1

Entering Reset

When the ICS1893AF 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 ICS1893AF exits a reset condition, it does the following:

Exits the power-down state

Latches the Serial Management Port Address of the ICS1893AF 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 ICS1893AF 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 ICS189X products, the ICS1893AF reset design supports ‘hot insertion’ of its MII. (That is, the

ICS1893AF can connect its MAC/Repeater Interface to a MAC/repeater while power is already applied to

the MAC/repeater.)

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