AM79C989JCT Advanced Micro Devices, AM79C989JCT Datasheet - Page 20

• Manufacturer Part Number: AM79C989JCT
• Description: Quad Ethernet Switching Transceiver (QuEST)
• Manufacturer: Advanced Micro Devices

Auto-Negotiation Status Register (Reg 1)
The Auto-Negotiation Status Register (Reg 1) contains
20
Bit(s)
15:13
10:7
6:0
12
11
8
7
6
5
4
3
2
1
0
Auto-Negotiation Ability
Extended Register
Duplex_Mode
Collision Test
Auto-Negotiation
Jabber Detect
Reserved
Remote Fault
Half Duplex
Full Duplex
Link Status
Capability
Reserved
Reserved
Preamble
Complete
Suppress
Name
1 = The port can be forced into full duplex operation when both the
Duplex_Mode set and the ANEG_EN bit clear. If the ANEG_EN bit
is set, this bit is ignored. When the Duplex_Mode is modified, the
port status will not be modified unless the ANEG_EN bit is cleared.
0 = Port is forced to half-duplex mode when ANEG_EN bit is
cleared. If ANEG_EN bit is set, this bit is ignored.
1 = Collision indication will occur on the channel after the transmit
enable bit (QTX_EN) is asserted.
0 = Port operation is normal.
Written and read as zero.
Table 8. Auto-Negotiation Status Register (Reg 1)
Written and read as zero.
1= Capable of operation in full duplex mode;
0 = Not able to perform full duplex mode.
1= Capable of operation in half duplex mode;
0 = Not able to perform half duplex mode.
Written and read as zero.
1 = Management Interface operates with or without preamble
suppression;
0 = Not applicable: Management Interface will operate with or
without preamble suppression.
1 = Auto-Negotiation is complete;
0 = Auto-Negotiation is not complete.
1 = Remote fault detected from link partner;
0 = No remote fault detected.
1 = Capable of Auto-Negotiation;
0 = Not available
1 = Link is up;
0 = Link is down.
1 = Jabber Condition detected;
0 = Jabber Condition not detected.
1 = Extended Register Capability;
0 = Not applicable.
P R E L I M I N A R Y
Am79C989
Description
Read/Only (R/O) bits or Clear on Read (COR) bits. This
register is duplicated for each port.
R/O, COR
R/W
R/W
R/O
Read/
Write
R/O
R/O
R/O
R/O
R/O
R/O
R/O
R/O
R/O
R/O
Default/
Reset
0
0
0
1
1
1
0
0
1
0
0
1
0
0