78Q2120C Teridian Semiconductor Corp. (TDK Semiconductor), 78Q2120C Datasheet - Page 14

• Manufacturer Part Number: 78Q2120C
• Description: 10/100 Ethernet PHYS
• Manufacturer: Teridian Semiconductor Corp. (TDK Semiconductor)

MR3: PHY Identifier Register 2
MR4: Auto-Negotiation Advertisement Register
© 2003 TDK Semiconductor Corporation, Proprietary and Confidential
MR2: PHY Identifier Register 1
3.15:10
4.12:10
2.15:0
4.12:5
3.9:4
3.3:0
4.4:0
4.15
4.14
4.13
4.9
4.8
4.7
4.6
4.5
Bit
Bit
Bit
Symbol
Symbol
Symbol
RSVD
[23:6]
A7:5
S4:0
TAF
[5:0]
OUI
OUI
NP
RF
A4
A3
A2
A1
A0
MN
RN
Type
R/W
R/W
R/W
R/W
R/W
R/W
Type
Type
R
R
R
R
R
R
R
R
R
Default Description
000Eh Organizationally Unique Identifier:
(0Fh)
Value Description
Value Description
01h
1Ch
0Ch
(1)
(1)
(1)
(1)
5h
0
0
0
0
0
Semiconductor Corporation. This register contains the first 16-bits of
the identifier.
Organizationally Unique Identifier: Remaining 6 bits of the OUI.
Model Number: The last 2 digits of the model number 2120C are
encoded into the 6 bits.
Revision Number: The value ‘0101’ corresponds to the fifth revision of
the silicon.
Next Page: Not supported. Reads logic zero.
Reserved
Remote Fault: Setting this bit to ‘1’ allows the device to indicate to the
link partner a Remote Fault Condition.
Technology Ability Field: The default value of this field is dependent
upon the MR1.15:11 register bits. This field can be overwritten by
management to auto-negotiate to an alternate common technology.
Writing to this register has no effect until auto-negotiation is re-initiated.
Reserved for future technology.
100BASE-T4:
operation.
100BASE-TX Full Duplex: If the MR1.14 bit is ‘1’, this bit will be set to
‘1’ upon reset and will be writeable. Otherwise, this bit cannot be set to
‘1’ by the management.
100BASE-TX: If the MR1.13 bit is ‘1’, this bit will be set to ‘1’ upon
reset and will be writeable. Otherwise, this bit cannot be set to ‘1’ by
the management.
10BASE-T Full Duplex: If the MR1.12 bit is ‘1’, this bit will be set to ‘1’
upon reset and will be writeable. Otherwise, this bit cannot be set to ‘1’
by the management.
10BASE-T: If the MR1.11 bit is ‘1’, this bit will be set to ‘1’ upon reset
and will be writeable. Otherwise, this bit cannot be set to ‘1’ by the
management.
Selector Field: Hard coded with the value of ‘00001’ for IEEE 802.3.
- 14 -
The 78Q2120C does not support 100BASE-T4
10/100BASE-TX Transceiver
This value is 00-C0-39 for TDK
78Q2120C
Rev_1.1