78Q2120 Teridian Semiconductor Corp. (TDK Semiconductor), 78Q2120 Datasheet - Page 14

• Manufacturer Part Number: 78Q2120
• Description: 10/100 Ethernet PHYS
• Manufacturer: Teridian Semiconductor Corp. (TDK Semiconductor)

MR4 - AUTO-NEGOTIATION ADVERTISEMENT REGISTER
MR5 - AUTO-NEGOTIATION LINK PARTNER ABILITY REGISTER
4.12:10
4.12:5
5.12:5
4.4:0
5.4:0
4.15
4.14
4.13
5.15
5.14
5.13
BIT
4.9
4.8
4.7
4.6
4.5
SYMBOL
RSVD
A7:5
S4:0
TAF
ACK
S4:0
A7:0
NP
RF
A4
A3
A2
A1
A0
NP
RF
R, 00001
R, W, (1)
R, W, (1)
R, W, (1)
R, W, (1)
R, 00000
R, W, 0
R, 000
TYPE
R, W,
(0Fh)
R, 0
R,0
R,0
R, 0
R, 0
R, 0
R, 0
RESERVED: This bit is permanently set to logic 0.
DESCRIPTION
NEXT PAGE: Not supported; permanently tied to logic zero.
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 78Q2120-64CGT 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.
NEXT PAGE: When set, it indicates that the link partner wishes to
engage in next page exchange.
ACKNOWLEDGE: When set, it indicates that the link partner has
successfully received at least 3 consecutive and consistent FLP
bursts.
REMOTE FAULT: When set, it indicates that the link partner has a
fault.
TECHNOLOGY ABILITY FIELD: This field contains the technology
ability of the link partner. The bit definition is the same as
MR4.12:5.
SELECTOR FIELD: This field contains the type of message sent by
the link partner. For IEEE-802.3 compliant link partner transceiver,
this field should be 00001.
14
Ethernet Transceiver
10/100BASE-TX