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參數(shù)資料
| 型號(hào)： | AM79C989JCT |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | 網(wǎng)絡(luò)接口 |
| 英文描述： | Quad Ethernet Switching Transceiver (QuEST⑩) |
| 中文描述： | DATACOM, ETHERNET TRANSCEIVER, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁數(shù)： | 20/37頁 |
| 文件大小： | 198K |
| 代理商： | AM79C989JCT |
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20
Am79C989
P R E L I M I N A R Y
Auto-Negotiation Status Register (Reg 1)
The Auto-Negotiation Status Register (Reg 1) contains
Read/Only (R/O) bits or Clear on Read (COR) bits. This
register is duplicated for each port.
Table 8.
Auto-Negotiation Status Register (Reg 1)
8
Duplex_Mode
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.
R/W
0
7
Collision Test
1 = Collision indication will occur on the channel after the transmit
enable bit (QTX_EN) is asserted.
0 = Port operation is normal.
R/W
0
6:0
Reserved
Written and read as zero.
R/O
0
Bit(s)
Name
Description
Read/
Write
Default/
Reset
15:13
Reserved
Written and read as zero.
R/O
0
12
Full Duplex
1= Capable of operation in full duplex mode;
0 = Not able to perform full duplex mode.
R/O
1
11
Half Duplex
1= Capable of operation in half duplex mode;
0 = Not able to perform half duplex mode.
R/O
1
10:7
Reserved
Written and read as zero.
R/O
0
6
Preamble
Suppress
1 = Management Interface operates with or without preamble
suppression;
0 = Not applicable: Management Interface will operate with or
without preamble suppression.
R/O
1
5
Auto-Negotiation
Complete
1 = Auto-Negotiation is complete;
0 = Auto-Negotiation is not complete.
R/O
0
4
Remote Fault
1 = Remote fault detected from link partner;
0 = No remote fault detected.
R/O, COR
0
3
Auto-Negotiation Ability
1 = Capable of Auto-Negotiation;
0 = Not available
R/O
1
2
Link Status
1 = Link is up;
0 = Link is down.
R/O
0
1
Jabber Detect
1 = Jabber Condition detected;
0 = Jabber Condition not detected.
R/O
0
0
Extended Register
Capability
1 = Extended Register Capability;
0 = Not applicable.
R/O
1
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