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MII Management Register Descriptions
19.7.2 Ethernet PHY Management Register 1 – Status (MR1) Register, address 0x01
This register enables software to determine the capabilities of an external PHY and perform its
initialization and operation appropriately.
Figure 19-22. Ethernet PHY Management Register 1 – Status (MR1) Register
15
14
Reserved
100X_F
R-0
R-1
7
6
Reserved
R-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 19-21. Ethernet PHY Management Register 1 – Control (MR1) Register Field Descriptions
Bit
Field
15
Reserved
14
100X_F
13
100X_H
12
10T_F
11
10T_H
10-6
Reserved
5
ANEGC
4
RFAULT
3
ANEGA
2
LINK
1
JAB
0
EXTD
1404
M3 Ethernet Media Access Controller (EMAC)
13
12
100X_H
10T_F
R-1
R-1
5
4
ANEGC
RFAULT
R-0
R-0
Value
Description
1
Reserved
100BASE-TX Full-Duplex Mode
0
The Ethernet PHY is not capable of supporting 100BASE-TX Full-Duplex mode.
1
The Ethernet PHY is capable of supporting 100BASE-TX Full-Duplex mode.
100BASE-TX Half-Duplex Mode
0
The Ethernet PHY is not capable of supporting 100BASE-TX Half-Duplex mode
1
The Ethernet PHY is capable of supporting 100BASE-TX Half-Duplex mode.
10BASE-T Full-Duplex Mode
0
The Ethernet PHY is not capable of supporting 10BASE-T Full-Duplex mode.
1
The Ethernet PHY is capable of supporting 10BASE-T Full-Duplex mode.
10BASE-T Half-Duplex Mode
0
The Ethernet PHY is not capable of supporting 10BASE-T Half-Duplex mode.
1
The Ethernet PHY is capable of supporting 10BASE-T Half-Duplex mode.
Reserved
Auto-Negotiation Complete
0
The auto-negotiation process is not complete.
1
The auto-negotiation process has been completed and that the extended registers defined by the
auto-negotiation protocol are valid.
Remote Fault
0
A remote fault condition has not been detected.
1
A remote fault condition has been detected.
This bit remains set until it is read, even if the condition no longer exists.
Auto-Negotiation
0
The Ethernet PHY does not have the ability to perform auto-negotiation.
1
The Ethernet PHY has the ability to perform auto-negotiation.
Link Made
0
A valid link has not been established by the Ethernet PHY.
1
A valid link has been established by the Ethernet PHY.
Jabber Condition
0
A jabber condition has not been detected by the Ethernet PHY.
1
A jabber condition has been detected by the Ethernet Controller
This bit remains set until it is read, even if the jabber condition no longer exists.
Extended Capabilities
0
The Ethernet PHY does not provide extended capabilities
1
The Ethernet PHY provides an extended set of capabilities that can be accessed through the
extended register set.
Copyright © 2012–2019, Texas Instruments Incorporated
11
10
10T_H
R-1
3
2
ANEGA
LINK
R-0
R-0
SPRUH22I – April 2012 – Revised November 2019
www.ti.com
8
Reserved
R-0
1
0
JAB
EXTD
R-C
R-0
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