LM3S6950 Datasheet, PDF (395/524 Pages) List of Unclassifed Manufacturers – Microcontroller

LM3S6950 Microcontroller
Register 21: Ethernet PHY Management Register 4 – Auto-Negotiation
Advertisement (MR4), offset 0x04
This register provides the advertised abilities of the PHY used during Auto-Negotiation. Bits 12:5
represent the Technology Ability Field bits, A[7:0]. 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.
Ethernet PHY Management Register 4 – Auto-Negotiation Advertisement (MR4)
Base 0x4004.8000
Offset 0x04
Type R/W, reset 0x01E1
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
reserved
Type RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
NP reserved RF
reserved
A3
A2
A1
A0
S[4:0]
Type RO
RO
R/W
RO
RO
RO
RO
R/W
R/W
R/W
R/W
RO
RO
RO
RO
RO
Reset
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
Bit/Field
31:16
15
14
13
12:9
8
7
Name
reserved
NP
reserved
RF
reserved
A3
A2
Type
RO
RO
RO
R/W
RO
R/W
R/W
Reset
0
0
0
0
0
1
1
Description
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.
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.
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.
June 14, 2007
395
Luminary Micro Confidential-Advance Product Information