ICS1893AG データシートの表示（PDF） - Integrated Circuit Systems

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ICS1893AG

3.3 V 10Base-T/100Base-TX Integrated PHYceiver™

Integrated Circuit Systems 

ICS1893AG Data Sheet - Preliminary

Chapter 5 Operating Modes Overview

5.1 Reset Operations

This section first discusses reset operations in general and then specific ways in which the ICS1893AG 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 ICS1893AG can be reset, which

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

5.1.1.1 Entering Reset

When the ICS1893AG enters a reset condition (either through hardware, power-on reset, or software), it

does the following:

1. Isolates the MAC/Repeater Interface input pins

2. Drives all MAC/Repeater Interface output pins low

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

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

5. Enters the power-down state

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

Register bits to their default values

5.1.1.2 Exiting Reset

When the ICS1893AG exits a reset condition, it does the following:

1. Exits the power-down state

2. Latches the Serial Management Port Address of the ICS1893AG into the Extended Control Register,

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

3. Enables all its internal modules and state machines

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

associated ICS1893AG input pins, as determined by the HW/SW pin

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

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

(TXCLK) and receive clock (RXCLK)

7. 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 ICS1893AG reset design supports ‘hot insertion’ of its MII. (That is, the

ICS1893AG can connect its MAC/Repeater Interface to a MAC/repeater while power is already applied to

the MAC/repeater.)

ICS1893AG, Rev A 04/14/05

Copyright © 2005, Integrated Circuit Systems, Inc.

All rights reserved.

18

April, 2005

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