参数资料
型号: IP178CHLF
厂商: Electronic Theatre Controls, Inc.
英文描述: 8 Port 10/100 Ethernet Integrated Switch
中文描述: 8端口10/100以太网集成开关
文件页数: 45/91页
文件大小: 1244K
代理商: IP178CHLF
IP178C
Preliminary Data Sheet
2.12
Serial management interface
User can access IP178C’s MII registers through serial management interface with pin MDC and MDIO.
Its format is shown in the following table. To access MII register in IP178C, 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.
Syatem diagram
CPU
MDIO
178C
MDC
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.
45/91
October 27, 2005
IP178C-DS-R09
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