78Q2123CGV/F TERIDIAN [Teridian Semiconductor Corporation], 78Q2123CGV/F Datasheet - Page 15

• Manufacturer Part Number: 78Q2123CGV/F
• Description: 10/100BASE-TX Transceiver
• Manufacturer: TERIDIAN [Teridian Semiconductor Corporation]

MR4: Auto-Negotiation Advertisement Register
Note: Technology Ability Field: MR4.12:5 are the Technology Ability Field bits (A7:0). 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.
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4.4:0
4.15
4.14
4.13
4.12
4.11
4.10
BIT
4.9
4.8
4.7
4.6
4.5
SYMBOL
RSVD
S4:0
NP
RF
A7
A6
A5
A4
A3
A2
A1
A0
TYPE DEFAULT DESCRIPTION
R/W
R/W
R/W
R/W
R/W
R/W
R
R
R
R
R
R
01h
(1)
(1)
(1)
(1)
0
0
0
0
0
0
0
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.
Reserved.
Asymmetric PAUSE Support Indication for Full Duplex Links. Default is
0 indicating not supported. If the MAC supports Asymmetric PAUSE,
this bit can be written as 1. Writing to this register has no effect until
auto-negotiation is re-initiated.
PAUSE Support Indication for Full Duplex Links. Default is 0 indicating
not supported. If the MAC supports PAUSE, this bit can be written as 1.
Writing to this register has no effect until auto-negotiation is re-initiated
100BASE-T4: The 78Q2123/78Q2133 do not support 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.
©
2009 Teridian Semiconductor Corporation
10/100BASE-TX Transceiver
Rev 1.5