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參數(shù)資料
| 型號(hào)： | AM79C875KI |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | 網(wǎng)絡(luò)接口 |
| 英文描述： | NetPHY⑩ 4LP Low Power Quad 10/100-TX/FX Ethernet Transceiver |
| 中文描述： | DATACOM, ETHERNET TRANSCEIVER, PQFP100 |
| 封裝： | 14 X 20 MM, PLASTIC, QFP-100 |
| 文件頁(yè)數(shù)： | 24/48頁(yè) |
| 文件大?。?/td> | 2480K |
| 代理商： | AM79C875KI |
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Idle
Start
Opcode
(Read)
PHY Address
16h, Port 2
Register Address
MII Status, 1h
TA
Register Data
Idle
z
z
z
MDC
MDIO
(PHY)
MDIO
(STA)
z
z
0
1
1
0
1
0
1
1
0
0
0
0
0
1
0
0
1
1
0
0
0
0
0
1
0
0
0
0
0
1
0
z
z
Read Operation
Idle
Start
Opcode
(Write)
PHY Address
16h, Port 2
Register Address
MII Control, 0h
TA
Register Data
Idle
z
z
MDC
MDIO
(STA)
z
0
1
0
1
1
0
1
1
0
0
0
0
0
0
1
0
0
1
1
0
0
0
1
0
0
0
0
0
0
0
0
0
z
Write Operation
22236G-11
24
Am79C875
Figure 9. PHY Management Read and Write Operations
Bad Management Frame Handling
The management block of the device can recognize
management frames without preambles (preamble
suppression). However, if it receives a bad manage-
ment frame, it will go into a Bad Management Frame
state. It will stay in this state and will not respond to any
management frame without preambles until a frame
with a full 32-bit preamble is received, then it will return
to normal operation.
A bad management frame is a frame that does not
comply with the IEEE standard specification. It can be
one with less than 32-bit preamble, with illegal OP field,
etc. However, a frame with more than 32 preamble bits
is considered to be a good frame.
Table 5. NetPHY 4LP MII Management
Register Set
Register
Address (in
decimal)
Description
0
MII Management Control Register
1
MII Management Status Register
2
PHY Identifier 1 Register
3
PHY Identifier 2 Register
4
Auto-Negotiation Advertisement Register
5
Auto-Negotiation Link Partner Ability
Register
6
Auto-Negotiation Expansion Register
7
Next Page Advertisement Register
8-15
Reserved
16
Miscellaneous Features Register
17
Interrupt Control/Status Register
18
Diagnostic Register
19
Test Register
20
Miscellaneous Features 2
21
Receiver Error Counter
22
Reserved
23
Reserved
24
Mode Control Register
25-31
Reserved
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