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AM79C989JC Datasheet(PDF) 25 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) 25 Page - Advanced Micro Devices

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Am79C989
25
PRELIMINARY
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
(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.
Table 17.
Summary Status Register (Reg 17)
Bit(s)
Name
Description
Read/
Write
Default/
Reset
15
Link Status
Port 3
1 = Link Status of port 3 is up;
0 = Link Status of port 3 is down.
R/O
0
14
Full Duplex
Port 3
1 = Port 3 is operating in full duplex mode;
0 = Port 3 is operating in half duplex mode.
R/O
0
13
Auto-Negotiation Alert
Port 3
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.
R/O
0
12
MAU Error
Port 3
1= 10BASE-T MAU error for port 3 summary;
0= No MAU Error on Port 3.
R/O
0
11
Link Status
Port 2
1 = Link Status of port 2 is up;
0 = Link Status of port 2 is down.
R/O
0
10
Full Duplex
Port 2
1 = Port 2 is operating in full duplex mode;
0 = Port 2 is operating in half duplex mode.
R/O
0
9
Auto-Negotiation Alert
Port 2
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.
R/O
0
8
MAU Error
Port 2
1= 10BASE-T MAU error for port 2 summary;
0= No MAU Error on Port 2.
R/O
0
7
Link Status
Port 1
1 = Link Status of port 1 is up;
0 = Link Status of port 1 is down.
R/O
0
6
Full Duplex
Port 1
1 = Port 1 is operating in full duplex mode;
0 = Port 1 is operating in half duplex mode.
R/O
0
5
Auto-Negotiation Alert
Port 1
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.
R/O
0
4
MAU Error
Port 1
1= 10BASE-T MAU error for port 1 summary;
0= No MAU Error on Port 1.
R/O
0
3
Link Status
Port 0
1 = Link Status of port 0 is up;
0 = Link Status of port 0 is down.
R/O
0
2
Full Duplex
Port 0
1 = Port 0 is operating in full duplex mode;
0 = Port 0 is operating in half duplex mode.
R/O
0
1
Auto-Negotiation Alert
Port 0
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.
R/O
0
0
MAU Error
Port 0
1= 10BASE-T MAU error for port 0 summary;
0= No MAU Error on Port 0.
R/O
0



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