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| 型號(hào)： | E-110 |
| 廠商： | LSI Corporation |
| 英文描述： | 100BASE-T Fast Ethernet Core(100BASE-T快速以太網(wǎng)處理芯片 Fast Ethernet Core) |
| 中文描述： | 100兆- T的快速以太網(wǎng)核心（100兆- T的快速以太網(wǎng)處理芯片快速以太網(wǎng)核心） |
| 文件頁(yè)數(shù)： | 92/130頁(yè) |
| 文件大?。?/td> | 770K |
| 代理商： | E-110 |
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3-20
Core Descriptions
The PHY Control Register (Register 0) layout is shown in Table 3.2.
Table 3.2
PHY Control Register Bit Definitions
Bit
Name
Description
Operation
15
Reset
1 = PHY reset
0 = Normal operation
R/W,
1
SC
2
1. R/W = Read/Write.
2. SC = Self-Clearing. (After the bit is set to one, the operation takes place and
the PHY clears the bit back to zero.)
3. Loopback connects the PHY transmit signals to the PHY receive signals,
which allows network isolation and troubleshooting.
4. Auto-negotiation is a signalling method described in clause 28 of the IEEE
802.3u specification. It allows each node to define its own operating mode
(for example, 10 Mbit/s, 100 Mbit/s, 100BASE-TX, 100BASE-T4, or full-
duplex) and to determine the operating mode of the node to which it is con-
necting. Auto-negotiation is conceptually similar to the signalling method used
with modems, where two nodes negotiate their capabilities and settle on the
highest common denominator.
14
Loopback
1 = Enable loopback
3
0 = Disable loopback
R/W
13
Speed Selection
1 = 100 Mbit/s
0 = 10 Mbit/s
R/W
12
Auto-Negotiation
Enable
1 = Enable auto-negotiation
4
0 = Disable auto-negotiation
R/W
11
Power Down
1 = Power down
0 = Normal operation
R/W
10
Isolate
1 = Electrically isolate PHY from MII
0 = Normal operation
R/W
9
Restart Auto-
Negotiation
1 = Restart auto-negotiation process
0 = Normal operation
R/W, SC
8
Duplex Mode
1 = Full-duplex
0 = Half-duplex
R/W
7
Collision Test
1 = Enable COL signal test
0 = Disable COL signal test
R/W
6–0
Reserved
Write as 0, ignore on read
R/W
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