am79c989 Advanced Micro Devices, am79c989 Datasheet - Page 25

• Manufacturer Part Number: am79c989
• Description: Quad Ethernet Switching Transceiver
• Manufacturer: Advanced Micro Devices

Summary Status Register (Reg 17)
The Summary Status Register (Reg 17) is a global reg-
ister accessible to all ports. This register is Read/Only
Bit(s)
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Auto-Negotiation Alert
Auto-Negotiation Alert
Auto-Negotiation Alert
Auto-Negotiation Alert
Full Duplex
Full Duplex
Link Status
Link Status
Link Status
Full Duplex
Link Status
Full Duplex
MAU Error
MAU Error
MAU Error
MAU Error
Name
Port 3
Port 3
Port 3
Port 3
Port 2
Port 2
Port 2
Port 2
Port 1
Port 1
Port 1
Port 1
Port 0
Port 0
Port 0
Port 0
1 = Link Status of port 3 is up;
0 = Link Status of port 3 is down.
1 = Port 3 is operating in full duplex mode;
0 = Port 3 is operating in half duplex mode.
1 = Status of Auto-Negotiation function for port 3 has changed
(i.e, new page received);
0 = Auto-Negotiation function for port 3 does not require servicing.
1= 10BASE-T MAU error for port 3 summary;
0= No MAU Error on Port 3.
1 = Link Status of port 2 is up;
0 = Link Status of port 2 is down.
1 = Port 2 is operating in full duplex mode;
0 = Port 2 is operating in half duplex mode.
1 = Status of Auto-Negotiation function for port 2 has changed (i.e,
new page received);
0 = Auto-Negotiation function for port 2 does not require servicing.
1= 10BASE-T MAU error for port 2 summary;
0= No MAU Error on Port 2.
1 = Link Status of port 1 is up;
0 = Link Status of port 1 is down.
1 = Port 1 is operating in full duplex mode;
0 = Port 1 is operating in half duplex mode.
1 = Status of Auto-Negotiation function for port 1 has changed (i.e,
new page received);
0 = Auto-Negotiation function for port 1 does not require servicing.
1= 10BASE-T MAU error for port 1 summary;
0= No MAU Error on Port 1.
1 = Link Status of port 0 is up;
0 = Link Status of port 0 is down.
1 = Port 0 is operating in full duplex mode;
0 = Port 0 is operating in half duplex mode.
1 = Status of Auto-Negotiation function for port 0 has changed (i.e,
new page received);
0 = Auto-Negotiation function for port 0 does not require servicing.
1= 10BASE-T MAU error for port 0 summary;
0= No MAU Error on Port 0.
Table 17. Summary Status Register (Reg 17)
P R E L I M I N A R Y
Am79C989
Description
(R/O). The summary register allocates four bits per
each port. Each port conveys: Link Status, Duplex Sta-
tus, Auto-Negotiation Alert, and 10BASE-T MAU Error.
Read/
Write
R/O
R/O
R/O
R/O
R/O
R/O
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
0
0
0
0
0
0
0
0
0
0
0
0
0
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