ICS1892 datasheet(99/148 Pages) ICST

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Chapter 8

Management Register Set

ICS1892, Rev. D, 2/26/01

February 26, 2001

ICS1892

8.14.1

Node/Repeater Configuration (bit 19.15)

The Node/Repeater Configuration bit directly indicates the state of the NOD/REP input pin. When this bit is

logic:

• Zero, the NOD/REP input pin is pulled down, which instructs the operation code to operate in Node

mode.

• One, the NOD/REP input pin is pulled up, which instructs the ICS1892 to operate in Repeater mode.

There are two primary differences between Node mode and Repeater mode.

• In Node mode:

– The SQE Test default setting is enabled.

– The Carrier Sense signal (CRS) is asserted in response to either transmit or receive activity.

• In Repeater mode:

– The SQE Test default setting is disabled.

– The Carrier Sense signal (CRS) is asserted in response only to receive activity.

8.14.2

Hardware/Software Priority Status (bit 19.14)

The Hardware/Software Priority Status bit directly indicates the state of the HW/SW pin. When this bit is

logic:

• Zero, the hardware pins have priority over the (software) register bits for establishing the ICS1892

configuration.

• One, the (software) register bits have priority over the hardware pins for establishing the ICS1892

configuration.

8.14.3

Remote Fault (bit 19.13)

The ISO/IEC specification defines bit 5.13 as the Remote Fault bit, and bit 19.13 is functionally identical to

bit 5.13. The Remote Fault bit is set based on the Link Control Word received from the remote link partner.

When this bit is a logic:

• Zero, it indicates the remote link partner does not detect a Link Fault.

• One, it indicates to the ICS1892/STA that the remote link partner detects a Link Fault.

8.14.4

ICS Reserved (bits 19.12:2)

ICS reserves these bits for future use. Functionally, these bits are equivalent to an IEEE Reserved bit.

When each of these reserved bits is:

• Read by an STA, the ICS1892 returns a logic zero.

• Written to by an STA, the STA must use the default value specified in this data sheet.

In general, ICS uses some reserved bits to invoke auxiliary functions. To ensure proper operation of the

ICS1892, an STA must maintain the default value of these bits. Therefore, ICS recommends that an STA

always write the default value of any reserved bits during all management register write operations.

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