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Intel
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82575EB Gigabit Ethernet Controller — PHY Registers
Intel
®
82575EB Gigabit Ethernet Controller 324632-003
Software Developer’s Manual and EEPROM Guide Revision: 2.1
320 January 2011
14.3.8.14 Port Status 1 Register - PSTAT (17d; RO)
Transmit Disable 13 1b = Disable twisted-pair transmitter.
0b = Normal operation.
R/W 0b
Link Disable 14 1b = Force link pass
0b = Normal operation
For 10BASE-T, this bit forces the link signals to be active. In
100BASE-T mode, setting this bit should force the Link Monitor
into it’s LINKGOOD state. For Gigabit operation, this merely
bypasses Auto-Negotiation—the link signals still correctly
indicate the appropriate status.
R/W 0b
Reserved 15 Always read as 0b. Write 0b for normal operation. R/W 0b
Field Bit(s) Description Mode Default
LFIT Indicator 0 Status bit indicating the Auto-Negotiation Link Fail Inhibit Timer
has expired. This indicates that the Auto-Negotiation process
completed page exchanges but was unable to bring up the
selected MAU’s link.
1b = Auto-Negotiation has aborted Link establishment following
normal page exchange.
0b = Auto-Negotiation has either completed normally, or is still
in progress.
This bit is cleared when read or when one of the following
occurs:
Link comes up (PHY register 17d, bit 10 = 1b).
Auto-Negotiation is disabled (PHY register 00d, bit 12 = 0b).
Auto-Negotiation is restarted (PHY register 00d, bit 9 = 1b).
RO/
LH/SC
0b
Polarity Status 1 1b = 10BASE-T polarity is reversed.
0b = 10BASE-T polarity is normal.
RO 0b
Reserved 8:2 Ignore these bits. RO 0b
Duplex Mode 9 1b = Full duplex.
0b = Half duplex.
RO 0b
Link 10 Indicates the current status of the link. Differs from PHY
register 01, bit 2 in that this bit changes anytime the link status
changes. PHY register 01, bit 2 latches low and stays low until
read regardless of link status.
1b = Link is currently up.
0b = Link is currently down.
RO 0b
MDI-X Status 11 Status indicator of the current MDI/MDI-X state of the twisted
pair interface. This status bit is valid regardless of the MAU
selected.
1b = PHY has selected MDI-X (crossed over).
0b = PHY has selected MDI (NOT crossed over).
RO 0b
Field Bit(s) Description Mode Default