參數(shù)資料
型號: IP175CH
廠商: Electronic Theatre Controls, Inc.
英文描述: 5 Port 10/100 Ethernet Integrated Switch
中文描述: 5端口10/100以太網(wǎng)集成開關(guān)
文件頁數(shù): 54/111頁
文件大?。?/td> 679K
代理商: IP175CH
IP175C/IP175C LF/IP175CH/IP175CH LF
Data Sheet
2.15
Serial management interface
175C supports two serial management interfaces (SMI). User can access IP175C/IP175CH’s MII
registers through MDC0 and MDIO0. Its format is shown in the following table. To access MII register in
IP175C/IP175CH, MDC should be at least one more cycle than MDIO. That is, a complete command
consists of 32 bits MDIO data and at least 33 MDC clocks. When the SMI is idle, MDIO is in high
impedance.
When IP175C/IP175CH interfaces to an external PHY, it uses MDC1 and MDIO1 to read the status of the
external PHY.
Frame
format
Read
Operation
Write
Operation
<Idle><start><op code><PHY address><Registers address><turnaround><data><idle>
<Idle><01><10><A
4
A
3
A
2
A
1
A
0
><R
4
R
3
R
2
R
1
R
0
><Z0><b
15
b
14
b
13
b
12
b
11
b
10
b
9
b
8
b
7
b
6
b
5
b
4
b
3
b
2
b
1
b
0
><Idle>
<Idle><01><01><A
4
A
3
A
2
A
1
A
0
><R
4
R
3
R
2
R
1
R
0
><10><b
15
b
14
b
13
b
12
b
11
b
10
b
9
b
8
b
7
b
6
b
5
b
4
b
3
b
2
b
1
b
0
><Idle>
0
b
0
0
b
1
0
b
2
0
b
3
0
b
4
0
b
5
0
b
6
0
b
7
1
b
8
1
b
9
0
b
1
0
0
b
1
1
1
b
1
2
1
b
1
3
0
b
1
4
0
b
1
5
0
1
0
R
0
0
R
1
0
R
2
0
R
3
0
R
4
1
A
0
0
A
1
0
A
2
0
A
3
0
A
4
1
0
1
0
1..1
idle
start
op
code
PHY address =
01h
Reg address =
00h
TA
Register data
idle
write
z
z
0
b
0
0
b
1
0
b
2
0
b
3
0
b
4
0
b
5
0
b
6
0
b
7
1
b
8
0
b
9
0
b
1
0
0
b
1
1
1
b
1
2
1
b
1
3
0
b
1
4
0
b
1
5
0
Z
0
R
0
0
R
1
0
R
2
0
R
3
0
R
4
1
A
0
0
A
1
0
A
2
0
A
3
0
A
4
0
1
1
0
idle
start
op
code
read
PHY address =
01h
Reg address =
00h
TA
Register data
idle
z
z
z
MDC
MDIO
MDC
MDIO
1..1
1..1
1..1
Copyright
2004, IC Plus Corp.
Mar 09, 2007
54/111
IP175C/IP175CH-DS-R14
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