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AM79C989JC Datasheet(PDF) 23 Page - Advanced Micro Devices

Part # AM79C989JC
Description  Quad Ethernet Switching Transceiver (QuEST??
PDF  37 Pages
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Manufacturer  AMD [Advanced Micro Devices]
Direct Link  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM79C989JC Datasheet(HTML) 23 Page - Advanced Micro Devices

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Am79C989
23
PRELIMINARY
Auto-Negotiation Expansion Register (Reg 6)
The Auto-Negotiation Expansion Register (Reg 6) pro-
vides additional information which assists in the Auto-
Negotiation process. The Auto-Negotiation Register
bits are Read/Only (R/O) or Cleared on Read (COR).
This register is duplicated for each port.
Table 14.
Auto-Negotiation Expansion Register (Reg 6)
Auto-Negotiation Next Page Register (Reg 7)
The Auto-Negotiation Next Page Register (Reg 7) con-
tains the next link page link code word to be transmit-
ted. The Auto-Negotiation Next Page Register contains
Read/Write (R/W) or Read/Only (R/O) bits. On power-
up the default value of 0x2001 represents a message
page with the message code set to null. This register is
duplicated for each port.
Table 15.
Auto-Negotiation Next Page Register (Reg 7)
Bit(s)
Name
Description
Read/
Write
Default/
Reset
15:4
Reserved
Written and read as zero.
R/O
0
3
Link Partner Next
Page Able
1 = Link partner is next page able.
0 = Link partner is not next page able.
R/O
0
2
Next Page Able
1 = QuEST device port is next page able.
0 = Not applicable.
R/O
1
1
Page Received
1 = A new page has been received.
0 = A new page has not been received.
Cleared on Read.
R/O, COR
0
0
Link Partner Auto-
Negotiation Able
1 = Link partner is Auto-Negotiation able.
0 = Link partner is not Auto-Negotiation able.
R/O
0
Bit(s)
Name
Description
Read/
Write
Default/
Reset
15
Next Page
1 = QuEST device port next page requested;
0 = QuEST device port next page not requested.
R/W
0
14
Reserved
Written and read as zero.
R/O
0
13
Message Page
1 = QuEST device port message page requested;
0 = QuEST device port unformatted page requested.
R/W
1
12
Acknowledge 2
1 = QuEST device port can comply with the request;
0 = QuEST device port cannot comply with the request.
R/W
0
11
Toggle
QuEST device port toggle bit.
R/O
0
10:0
Message Field
Message code field.
R/W
0x001



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