Ethernet MAC
UG0331 User Guide Revision 15.0 429
Table 425 • SGMII CONTROL
Bit Number Name
Reset
Value Description
15 PHY RESET 0x0 Setting this bit causes the PETEX, PEREX, and PEANX sub-modules
in the M-SGMII core to be reset. This bit is self-clearing.
14 LOOP BACK 0x0 Setting this bit causes the M-SGMII loopback. Clearing this bit results
in normal operation.
13 Reserved 0x0 Reserved.
12 AUTO-
NEGOTIATION
ENABLE
0x0 Setting this bit enables the auto-negotiation process.
[11:10] Reserved 0x0 Reserved.
9 RESET AUTO-
NEGOTIATION
0x0 Setting this bit causes the auto-negotiation process to restart. This
action is only available when auto-negotiation has been enabled.
[8:0] Reserved 0x0 Reserved
Table 426 • SGMII STATUS
Bit Number Name
Reset
Value Description
[15:9] Reserved 0x0 Reserved.
8 EXTENDED
STATUS
0x0 This bit returns ‘1’ on read to indicate that the PHY status information
is also contained in EXTENDED STATUS register.
7 Reserved 0x0 Reserved.
6 MF PREMABLE
SUPPRESSION
ENABLE
0x0 This bit indicates whether the PHY is capable of handling MII
management frames without the 32-bit preamble field.
Returns ‘1’ on read to indicate the support for suppressed preamble
MII management frames.
5AUTO-
NEGOTIATION
COMPLETE
0x0 This bit indicates that the Auto-negotiation process is completed.
Returns ‘0’ on read when either the auto-negotiation process is
underway or when the Auto-negotiation function is disabled.
4 REMOTE
FAULT
0x0 This bit returns ‘1’ on read to indicate a remote fault condition has
been detected between the M-SGMII and the PHY. This bit latches
high in order for software to detect the condition. Each read of the
STATUS register clears this bit.
3AUTO-
NEGOTIATION
ABILITY
0x0 When ‘1’, this bit indicates that the M-SGMII has the ability to
perform auto-negotiation. Returns ‘1’ on read.
2 LINK STATUS This bit indicates that a valid link is established between the
M-SGMII and the PHY.
Returns ‘0’ on read to indicate that there is no valid link is
established. This bit latches low to allow software polling to detect a
failure condition.
1 Reserved 0x0 Reserved
0 EXTENDED
CAPABILITY
0x1 This bit returns ‘1’ on read to indicates that the M-SGMII contains the
extended set of registers (those beyond CONTROL and STATUS).
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