ICS1892 datasheet(66/148 Pages) ICST

66 / 148 page

ICS1892, Rev. D, 2/26/01

February 26, 2001

Chapter 8

Management Register Set

ICS1892 Data Sheet

8.3

Table 8-6 lists the bits for the Status Register, an interface between the ICS1892 and the STA that has 16

bits of data. There are two types of status bits: some report the capabilities of the ICS1892, and some

indicate the state of signals used to monitor internal circuits.

The STA accesses the Status Register using the Serial Management Interface. During a reset, the

ICS1892 initializes the Status Register bits to pre-defined, default values.

Note:

For an explanation of acronyms used in Table 8-5, see Chapter 1, “Abbreviations and Acronyms”.

† As per the IEEE Std 802.3u, during any write operation to any bit in this register, the STA must write the default value

to all Reserved bits.

8.3.1

100Base-T4 (bit 1.15)

The STA reads this bit to learn if the ICS1892 can support 100Base-T4 operations. Bit 1.15 of the ICS1892

is permanently set to logic zero, which informs an STA that the ICS1892 cannot support 100Base-T4

operations.

Table 8-6.

Status Register (Register 1 [0x01])

Bit

Definition

When Bit = 0

When Bit = 1

Ac-

cess

De-

fault

Hex

1.15

100Base-T4

Always 0. (Not supported.)

N/A

–

1.14

100Base-TX full duplex

Mode not supported

Mode supported

–

1.13

100Base-TX half duplex

Mode not supported

Mode supported

–

1.12

10Base-T full duplex

Mode not supported

Mode supported

–

1.11

10Base-T half duplex

Mode not supported

Mode supported

–

1.10

IEEE reserved

Always 0

N/A

–

0†

1.9

IEEE reserved

Always 0

N/A

–

0†

1.8

IEEE reserved

Always 0

N/A

–

0†

1.7

IEEE reserved

Always 0

N/A

–

0†

1.6

MF Preamble

suppression

PHY requires MF

Preambles

PHY does not require

MF Preambles

–

1.5

Auto-Negotiation

complete

Auto-Negotiation is in

process, if enabled

Auto-Negotiation is

completed

1.4

Remote fault

No remote Fault Detected

Remote fault detected

1.3

Auto-Negotiation ability

N/A

Always 1: PHY has

Auto-Negotiation ability

–

1.2

Link status

Link is invalid/down

Link is valid/established

1.1

Jabber detect

No jabber condition

Jabber condition

detected

1.0

Extended capability

N/A

Always 1: PHY has

extended capabilities

–

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