AM79C989JCT Advanced Micro Devices, AM79C989JCT Datasheet - Page 25
AM79C989JCT
Manufacturer Part Number
AM79C989JCT
Description
Quad Ethernet Switching Transceiver (QuEST)
Manufacturer
Advanced Micro Devices
Datasheet
1.AM79C989JCT.pdf
(37 pages)
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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