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Software Developer’s Manual 269
Register Descriptions
PHY Port Status 1 Register (82541xx and 82547GI/EI Only)
PPSTAT (17d; R)
Table 13-34. PHY Status 1 Register Bit Description
Field Bit(s) Description Mode HW Rst SW Rst
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 17, bit 10 =
1b).
Auto-Negotiation is disabled (PHY
register 0, bit 12 = 0b).
Auto-Negotiation is restarted (PHY
register 0, bit 9 = 1b).
RO/
LH/
SC
0b 0b
Polarity Status 1
1b = 10BASE-T polarity is reversed.
0b = 10BASE-T polarity is normal.
RO 0b 0b
Reserved 8:2 Write to 0b for normal operation. RO 0b 0b
Duplex Mode 9
1b = Full duplex.
0b = Half duplex.
RO 0b 0b
Link 10
Indicates the current status of the link.
Differs from PHY register 1, bit 2 in that
this bit changes anytime the link status
changes. PHY register 1, 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 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 0b
Receive Status 12
1b = PHY currently receiving a packet.
0b = PHY receiver is IDLE.
When in loopback, this bit reads as 0b.
RO 0b 0b