ICS1892 Datasheet, PDF (80/148 Pages) Integrated Circuit Systems – 10Base-T/100Base-TX Integrated PHYceiver

ICS1892 Data Sheet
Chapter 8 Management Register Set
8.8 Register 6: Auto-Negotiation Expansion Register
Table 8-13 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 8-13, see Chapter 1, “Abbreviations and Acronyms”.
Table 8-13. Auto-Negotiation Expansion Register (register 6 [0x06])
Bit
Definition
6.15 IEEE reserved
6.14 IEEE reserved
6.13 IEEE reserved
6.12 IEEE reserved
6.11 IEEE reserved
6.10 IEEE reserved
6.9 IEEE reserved
6.8 IEEE reserved
6.7 IEEE reserved
6.6 IEEE reserved
6.5 IEEE reserved
6.4 Parallel detection fault
6.3 Link partner Next Page
able
6.2 Next Page able
6.1 Page received
6.0 Link partner
Auto-Negotiation able
When Bit = 0
Always 0
Always 0
Always 0
Always 0
Always 0
Always 0
Always 0
Always 0
Always 0
Always 0
Always 0
No Fault
Link partner is not Next
Page able
Local device is not Next
Page able
Next Page not received
Link partner is not
Auto-Negotiation able
When Bit = 1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Multiple technologies
detected
Link partner is Next Page
able
Local device is Next Page
able
Next Page received
Link partner is
Auto-Negotiation able
Ac- SF De- Hex
cess
fault
CW – 0† 0
CW – 0†
CW – 0†
CW – 0†
CW – 0† 0
CW – 0†
CW – 0†
CW – 0†
CW – 0† 0
CW – 0†
CW – 0†
RO LH 0
RO – 0 4
RO – 1
RO LH 0
RO – 0
† 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.
8.8.1 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 ICS1892 returns a logic zero.
• Writes to a reserved bit, the STA must use the default value specified in this data sheet.
ICS uses some of these 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.
Reserved bits 5.15:5 are Command Override Write (CW) bits. When the Command Register Override bit
(bit 16.15) is logic:
• Zero, the ICS1892 isolates all STA writes to CW bits.
• One, an STA can modify the value of these bits
ICS1892, Rev. D, 2/26/01
© 2000-2001, Integrated Circuit Systems, Inc.
All rights reserved.
80
February 26, 2001