LM3S8938 Datasheet, PDF (464/550 Pages) List of Unclassifed Manufacturers – Microcontroller

Ethernet Controller
Register 17: Ethernet PHY Management Register 0 – Control (MR0), offset
0x00
This register enables software to configure the operation of the PHY. The default settings of these
registers are designed to initialize the PHY to a normal operational mode without configuration.
Ethernet PHY Management Register 0 – Control (MR0)
Base 0x4004.8000
Offset 0x00
Type R/W, reset 0x3100
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
RESET LOOPBK SPEEDSL ANEGEN PWRDN ISO RANEG DUPLEX COLT
reserved
Type R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset
0
0
1
1
0
0
0
1
0
0
0
0
0
0
0
0
Bit/Field
31:16
15
14
13
12
11
10
9
Name
reserved
RESET
LOOPBK
SPEEDSL
ANEGEN
PWRDN
ISO
RANEG
Type
RO
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset
0
0
0
1
1
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.
Reset Registers
When set, resets the registers to their default state and reinitializes
internal state machines. Once the reset operation has completed, this
bit is cleared by hardware.
Loopback Mode
When set, enables the Loopback mode of operation. The receive circuitry
is isolated from the physical medium and transmissions are sent back
through the receive circuitry instead of the medium.
Speed Select
1: Enables the 100 Mb/s mode of operation (100BASE-TX).
0: Enables the 10 Mb/s mode of operation (10BASE-T).
Auto-Negotiation Enable
When set, enables the Auto-Negotiation process.
Power Down
When set, places the PHY into a low-power consuming state.
Isolate
When set, isolates transmit and receive data paths and ignores all
signaling on these buses.
Restart Auto-Negotiation
When set, restarts the Auto-Negotiation process. Once the restart has
initiated, this bit is cleared by hardware.
464
June 14, 2007
Luminary Micro Confidential-Advance Product Information