IP178C/IP178C LF/IP178CH/IP178CH LF
Datasheet
49/93
June 21, 2007
Copyright © 2004, IC Plus Corp.
IP178Cx-DS-R12
2.15
Register descriptions
R/W = Read/Write, SC = Self-Clearing, RO = Read Only, LL = Latching Low, LH = Latching High
Basic MII registers of port 0
PHY
MII
ROM
R/W
Description
Default
MII control register (address 00)
0
0.15
--
Reset
0
0
0.14
--
R/W
Loop back
1 = Loop back mode
0 = normal operation
When this bit set, IP178C/IP178CH 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
0
0.13
--
RW
Speed Selection
1 = 100 Mbpsbps
0 = 10 Mbpsbps
It is valid only if bit 0.12 is set to be 0.
1
0
0.12
--
RW
Auto-Negotiation Enable
1 = Auto-Negotiation Enable
0 = Auto-Negotiation Disable
1
0
0.11
--
R/W
Power Down
0
0
0.10
--
Isolate
0
0
0.9
--
RW
SC
Restart Auto- Negotiation
1 = re-starting Auto-Negotiation
0 = Auto-Negotiation re-start complete
Setting this bit to logic high will cause IP178C/IP178CH 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
0
0.8
--
R/W
Duplex mode
1 = full duplex
0 = half duplex
It is valid only if bit 0.12 is set to be 0.
0
0
0.7
--
R/W
Collision test
0
0
0[6:0]
--
R/W
Write as 0, ignore on read
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