Status Register (Sr) - Freescale Semiconductor MPC8313E Family Reference Manual

Enhanced Three-Speed Ethernet Controllers
15.5.4.3.2

Status Register (SR)

Figure 15-120 describes the definition for the SR register.
Offset 0x01
0
R
—
W
Reset 0 0 0 0 0
Table 15-127 describes the fields of the SR register.
Bits Name
0–6 — Reserved, should be cleared.
7 Extend This bit indicates that PHY status information is also contained in the Register 15, Extended Status Register.
Status Returns 1 on read. This bit is read-only.
8 — Reserved, should be cleared.
9 No MF preamble suppression enable. This bit indicates whether or not the PHY is capable of handling MII
Pre management frames without the 32-bit preamble field. Returns 1, indicating support for suppressed
preamble MII management frames. This bit is read-only.
10 AN Auto-negotiation complete. This bit is read-only and is cleared by default.
Done 0 Either the auto-negotiation process is underway or the auto-negotiation function is disabled.
1 The auto-negotiation process has completed.
11 Remote Remote fault. This bit is read-only and is cleared by default. Each read of the status register clears this bit.
Fault 0 Normal operation.
1 A remote fault condition was detected. This bit latches high in order for software to detect the condition.
12 AN Auto-negotiation ability. While read as set, this bit indicates that the PHY has the ability to perform
Ability auto-negotiation. While read as cleared, this bit indicates the PHY lacks the ability to perform
auto-negotiation. Returns 1 on read. This bit is read-only.
13 Link Link status. This bit is read-only and is cleared by default.
Status 0 A valid link is not established. This bit latches low allowing for software polling to detect a failure condition.
1 A valid link is established.
14 — Reserved, should be cleared.
15 Extend Extended capability. This bit indicates that the PHY contains the extended set of registers (those beyond
Ability control and status). Returns 1 on read. This bit is read-only.
MPC8313E PowerQUICC II Pro Integrated Processor Family Reference Manual, Rev. 3
15-126
6 7 8
Extend
No Pre
Status
—
0 0 1 0
Figure 15-120. Status Register Definition
Table 15-127. SR Descriptions
9 10 11
Remote
AN Done
Fault
1 0 0
Description
Access: Read only
12 13 14
Link
AN Ability
Status
—
1 0 0
Freescale Semiconductor
15
Extend
Ability
1