LM3S8938 Datasheet, PDF (481/550 Pages) List of Unclassifed Manufacturers – Microcontroller

LM3S8938 Microcontroller
Register 29: Ethernet PHY Management Register 24 –MDI/MDIX Control (MR24),
offset 0x18
This register enables software to control the behavior of the MDI/MDIX mux and its switching
capabilities.
Ethernet PHY Management Register 24 –MDI/MDIX Control (MR24)
Base 0x4004.8000
Offset 0x18
Type R/W, reset 0x00C0
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
reserved
PD_MODE AUTO_SW MDIX MDIX_CM
MDIX_SD
Type RO
RO
RO
RO
RO
RO
RO
RO
R/W
R/W
R/W
RO
R/W
R/W
R/W
R/W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit/Field
31:8
7
6
5
4
3:0
Name
reserved
PD_MODE
AUTO_SW
MDIX
MDIX_CM
MDIX_SD
Type
RO
R/W
R/W
R/W
RO
R/W
Reset
0
0
0
0
0
0
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.
Parallel Detection Mode
When set, enables the Parallel Detection mode and allows auto-switching
to work when Auto-Negotiation is not enabled.
Auto-Switching Enable
When set, enables Auto-Switching of the MDI/MDIX mux.
Auto-Switching Configuration
When set, indicates that the MDI/MDIX mux is in the crossover (MDIX)
configuration.
When 0, it indicates that the mux is in the pass-through (MDI)
configuration.
When the AUTO_SW bit is 1, the MDIX bit is read-only. When the
AUTO_SW bit is 0, the MDIX bit is read/write and can be configured
manually.
Auto-Switching Complete
When set, indicates that the auto-switching sequence has completed.
If 0, it indicates that the sequence has not completed or that
auto-switching is disabled.
Auto-Switching Seed
This field provides the initial seed for the switching algorithm. This seed
directly affects the number of attempts [5,4] respectively to write bits
[3:0].
A 0 sets the seed to 0x5.
June 14, 2007
481
Luminary Micro Confidential-Advance Product Information