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78Q2120C

10/100BASE-TX Transceiver

TDK Corporation 

78Q2120C

10/100BASE-TX Transceiver

MR2: PHY Identifier Register 1

Bit

2.15:0

Symbol

OUI

[23:6]

Type

R

Value

000Eh

Description

Organizationally Unique Identifier: This value is 00-C0-39 for TDK

Semiconductor Corporation. This register contains the first 16-bits of

the identifier.

MR3: PHY Identifier Register 2

Bit

3.15:10

3.9:4

Symbol

OUI

[5:0]

MN

3.3:0

RN

Type

R

R

R

Value Description

1Ch Organizationally Unique Identifier: Remaining 6 bits of the OUI.

0Ch Model Number: The last 2 digits of the model number 2120C are

encoded into the 6 bits.

5h Revision Number: The value ‘0101’ corresponds to the fifth revision of

the silicon.

MR4: Auto-Negotiation Advertisement Register

Bit Symbol

4.15

NP

4.14 RSVD

4.13

RF

4.12:5 TAF

4.12:10

4.9

A7:5

A4

4.8

A3

4.7

A2

4.6

A1

4.5

A0

4.4:0

S4:0

Type

R

R

R/W

R/W

R

R

R/W

R/W

R/W

R/W

R

Default Description

0 Next Page: Not supported. Reads logic zero.

0 Reserved

0 Remote Fault: Setting this bit to ‘1’ allows the device to indicate to the

link partner a Remote Fault Condition.

(0Fh)

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.

0 Reserved for future technology.

0 100BASE-T4: The 78Q2120C does not support 100BASE-T4

operation.

(1) 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.

(1) 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.

(1) 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.

(1) 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.

01h Selector Field: Hard coded with the value of ‘00001’ for IEEE 802.3.

© 2003 TDK Semiconductor Corporation, Proprietary and Confidential

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Rev_1.1

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