78Q2120-64CG ETC [List of Unclassifed Manufacturers], 78Q2120-64CG Datasheet - Page 13

• Manufacturer Part Number: 78Q2120-64CG
• Description: 10/100BASE-TX Ethernet Transceiver
• Manufacturer: ETC [List of Unclassifed Manufacturers]

MR2, 3 - PHY IDENTIFIER REGISTER
MR4 - AUTO-NEGOTIATION ADVERTISEMENT REGISTER
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
BIT
4.9
4.8
4.7
4.6
4.5
SYMBOL
RSVD
A7:5
S4:0
OUI
OUI
TAF
MN
RN
NP
RF
A4
A3
A2
A1
A0
R, 111001
R, 010100
R, W, (1)
R, W, (1)
R, W, (1)
R, W, (1)
R, 00001
R, 0300h
R, W, 0
TYPE
R, W,
(0Fh)
R, 0
R, 0
R,0
R,0
R
ORGANIZATIONALLY UNIQUE IDENTIFIER: This value is 00-
C0-39 for TDK Semiconductor Corporation. This translates to a
value of 300h for this register.
ORGANIZATIONALLY UNIQUE IDENTIFIER: Remaining 6 bits
of the OUI.
MODEL NUMBER: The last 2 digits of the model number
78Q2120 is encoded into the 6 bits. (20d = 14h)
REVISION NUMBER: For example, a value of 0010 corresponds
to the second version of the silicon.
DESCRIPTION
NEXT PAGE: Not supported; permanently tied to logic zero.
RESERVED: This bit is permanently set to logic 0.
REMOTE FAULT: When internally set to logic one, the MII
management interface indicates to the link partner a remote fault
condition.
TECHNOLOGY ABILITY FIELD: The default value of this field is
dependent upon MR1.15:11 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
enabled.
Reserved for future technology.
100BASE-T4: The 78Q2120 does support 100BASE-T4.
100BASE-TX FULL DUPLEX: The default value of this bit follows
MR1.14 bit. When the default is zero, this bit set by the
management.
100BASE-TX:The default value of this bit follows MR 1.13 bit. When
the default is zero, this bit cannot be set by the management.
10BASE-T FULL DUPLEX: The default value of this bit follows
MR1.12 bit. When the default is zero, this bit cannot be set by the
management.
10BASE-T: The default value of this bit follows MR1.11 bit. When
the default is zero, this bit cannot be set by the management.
SELECTOR FIELD: Hard coded with the value of 00001 for
IEEE-802.3.
13
Ethernet Transceiver
10/100BASE-TX
78Q2120