LM3S6938 Luminary Micro, Inc, LM3S6938 Datasheet - Page 456

• Manufacturer Part Number: LM3S6938
• Description: Lm3s6938 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

Reset
Type
Ethernet Controller
Ethernet PHY Management Register 24 –MDI/MDIX Control (MR24)
Base 0x4004.8000
Address 0x18
Type R/W, reset 0x00C0
456
Bit/Field
15:8
3:0
7
6
5
4
RO
15
0
Register 28: Ethernet PHY Management Register 24 –MDI/MDIX Control (MR24),
address 0x18
This register enables software to control the behavior of the MDI/MDIX mux and its switching
capabilities.
RO
14
0
PD_MODE
AUTO_SW
MDIX_CM
MDIX_SD
reserved
RO
13
0
Name
MDIX
RO
12
0
reserved
RO
11
0
Type
R/W
R/W
R/W
R/W
RO
RO
RO
10
0
Reset
0x0
RO
9
0
0
0
0
0
0
Preliminary
RO
8
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.
PD_MODE
R/W
7
0
AUTO_SW
R/W
6
0
MDIX
R/W
5
0
MDIX_CM
RO
4
0
R/W
3
0
R/W
2
0
MDIX_SD
July 25, 2008
R/W
1
0
R/W
0
0