IP175A LF
Preliminary Data Sheet
48/60
February 20, 2006
Copyright © 2004, IC Plus Corp.
IP175A LF-DS-R08
4.12
The basic MII registers
Type
Description
R/W
Read/Write
SC
Self-Clearing
RO
Read Only
Type
Description
LL
Latching Low
LH
Latching High
Bit
Function
R/W
Description
Default
MII control register (address 00H)
15
Reset
Not supported
0
14
Loop back
R/W
1 = Loopback mode
0 = normal operation
When this bit set, IP175A LF will be isolated from the
network media, that is, the assertion of TXEN at the MII will
not transmit data on the network. All MII transmission data
will be returned to MII receive data path in response to the
assertion of TXEN.
0
13
Speed Selection
RW
1 = 100Mbps
0 = 10Mbps
It is valid only if bit 0.12 is set to be 0.
1
12
Auto-Negotiation
Enable
RW
1 = Auto-Negotiation Enable
0 = Auto-Negotiation Disable
If port 4 is a fiber port, FXSD higher than 0.6v, this bit is fixed
at 0.
1
11
Power Down
R/W
Not supported
0
10
Isolate
Not supported
0
9
Restart Auto-
Negotiation
RW
SC
1 = re-starting Auto-Negotiation
0 = Auto-Negotiation re-start complete
Setting this bit to logic high will cause IP175A LF to restart
an Auto-Negotiation cycle, but depending on the value of bit
0.12 (Auto-Negotiation Enable). If bit 0.12 is cleared then
this bit has no effect, and it is Read Only. This bit is
self-clearing after Auto-Negotiation process is completed.
0
8
Duplex mode
R/W
1 = full duplex
0 = half duplex
It is valid only if bit 0.12 is set to be 0.
0
7
Collision test
R/W
Not supported
0
6:0
Reserved
R/W
Write as 0, ignore on read
-
Bit
Function
R/W
Description
Default
MII status register (address 01H)
15
100Base-T4
capable
RO
1 = 100Base-T4 capable
0 = not 100Base-T4 capable
IP175A LF does not support 100Base-T4. This bit is fixed to
be 0.
0
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