LM3S8971 Luminary Micro, Inc, LM3S8971 Datasheet - Page 453
LM3S8971
Manufacturer Part Number
LM3S8971
Description
Lm3s8971 Arm Microcontroller
Manufacturer
Luminary Micro, Inc
Datasheet
1.LM3S8971.pdf
(602 pages)
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Type
Ethernet PHY Management Register 4 – Auto-Negotiation Advertisement (MR4)
Base 0x4004.8000
Address 0x04
Type R/W, reset 0x01E1
July 26, 2008
Bit/Field
12:9
15
14
13
8
7
6
5
NP
RO
15
0
reserved
Register 20: Ethernet PHY Management Register 4 – Auto-Negotiation
Advertisement (MR4), address 0x04
This register provides the advertised abilities of the PHY used during Auto-Negotiation. Bits 8:5
represent the Technology Ability Field bits. This field can be overwritten by software to Auto-Negotiate
to an alternate common technology. Writing to this register has no effect until Auto-Negotiation is
re-initiated.
RO
14
0
R/W
reserved
reserved
RF
13
0
Name
NP
RF
A3
A2
A1
A0
RO
12
0
RO
11
0
reserved
Type
R/W
R/W
R/W
R/W
R/W
RO
RO
RO
RO
10
0
Reset
RO
9
0
0
0
0
0
1
1
1
1
Preliminary
R/W
A3
8
1
Description
Next Page
When set, indicates the PHY is capable of Next Page exchanges to
provide more detailed information on the PHY’s capabilities.
Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
Remote Fault
When set, indicates to the link partner that a Remote Fault condition
has been encountered.
Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
Technology Ability Field[3]
When set, indicates that the PHY supports the 100Base-TX full-duplex
signaling protocol. If software wants to ensure that this mode is not used,
this bit can be written to 0 and Auto-Negotiation re-initiated with the
RANEG bit in the MR0 register.
Technology Ability Field[2]
When set, indicates that the PHY supports the 100Base-T half-duplex
signaling protocol. If software wants to ensure that this mode is not used,
this bit can be written to 0 and Auto-Negotiation re-initiated.
Technology Ability Field[1]
When set, indicates that the PHY supports the 10Base-T full-duplex
signaling protocol. If software wants to ensure that this mode is not used,
this bit can be written to 0 and Auto-Negotiation re-initiated.
Technology Ability Field[0]
When set, indicates that the PHY supports the 10Base-T half-duplex
signaling protocol. If software wants to ensure that this mode is not used,
this bit can be written to 0 and Auto-Negotiation re-initiated.
R/W
A2
7
1
R/W
A1
6
1
R/W
A0
5
1
RO
4
0
LM3S8971 Microcontroller
RO
3
0
S[4:0]
RO
2
0
RO
1
0
RO
0
1
453
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