ICS1893CF datasheet(63/127 Pages) IDT

63 / 127 page

Chapter 7 Management Register Set

ICS1893CF, Rev. J, 08/11/09

August, 2009

ICS1893CF Data Sheet Rev. J - Release

7.8 Register 6: Auto-Negotiation Expansion Register

Table 7-13 lists the bits for the Auto-Negotiation Expansion Register, which indicates the status of the

Auto-Negotiation process.

Note: For an explanation of acronyms used in Table 7-13, 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.

7.8.1 IEEE Reserved Bits (bits 6.15:5)

The ISO/IEC specification reserves these bits for future use. When an STA:

• Reads a reserved bit, the ICS1893CF returns a logic zero.

• Writes to a reserved bit, the STA must use the default value specified in this data sheet.

ICS uses some reserved bits to invoke auxiliary functions. To ensure proper operation of the ICS1893CF,

an STA must maintain the default value of these bits. Therefore, IDT recommends that an STA always write

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

Reserved bits 5.15:5 are Command Override Write (CW) bits. When the Command Register Override bit

(bit 16.15) is logic:

• Zero, the ICS1893CF isolates all STA writes to CW bits.

• One, an STA can modify the value of these bits

Table 7-13. Auto-Negotiation Expansion Register (register 6 [0x06])

Bit

Definition

When Bit = 0

When Bit = 1

Ac-

cess

De-

fault

Hex

6.15

IEEE reserved

Always 0

N/A

–

0†

6.14

IEEE reserved

Always 0

N/A

–

0†

6.13

IEEE reserved

Always 0

N/A

–

0†

6.12

IEEE reserved

Always 0

N/A

–

0†

6.11

IEEE reserved

Always 0

N/A

–

0†

6.10

IEEE reserved

Always 0

N/A

–

0†

6.9

IEEE reserved

Always 0

N/A

–

0†

6.8

IEEE reserved

Always 0

N/A

–

0†

6.7

IEEE reserved

Always 0

N/A

–

0†

6.6

IEEE reserved

Always 0

N/A

–

0†

6.5

IEEE reserved

Always 0

N/A

–

0†

6.4

Parallel detection fault

No Fault

Multiple technologies

detected

6.3

Link partner Next Page

able

Link partner is not Next

Page able

Link partner is Next Page

able

–

6.2

Next Page able

Local device is not Next

Page able

Local device is Next Page

able

–

6.1

Page received

Next Page not received

Next Page received

6.0

Link partner

Auto-Negotiation able

Link partner is not

Auto-Negotiation able

Link partner is

Auto-Negotiation able

–

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