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

 

 

 

 

 

 

 

 

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.

RO/

 

 

 

 

0b

= Auto-Negotiation has either

 

 

LFIT Indicator

0

completed normally, or is still in

LH/

0b

0b

 

 

progress.

SC

 

 

 

 

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).

 

 

 

 

 

 

 

 

 

 

Polarity Status

1

1b

= 10BASE-T polarity is reversed.

RO

0b

0b

0b

= 10BASE-T polarity is normal.

 

 

 

 

 

 

 

 

 

 

 

Reserved

8:2

Write to 0b for normal operation.

RO

0b

0b

 

 

 

 

 

 

 

Duplex Mode

9

1b

= Full duplex.

RO

0b

0b

0b

= Half duplex.

 

 

 

 

 

 

 

 

 

 

 

 

 

Indicates the current status of the link.

 

 

 

 

 

Differs from PHY register 1, bit 2 in that

 

 

 

 

 

this bit changes anytime the link status

 

 

 

Link

10

changes. PHY register 1, bit 2 latches

RO

0b

0b

low and stays low until read regardless

 

 

of link status.

 

 

 

 

 

1b

= Link is currently up.

 

 

 

 

 

0b

= Link is currently down.

 

 

 

 

 

 

 

 

 

 

 

Status indicator of the current MDI/MDI-

 

 

 

 

 

X state of the twisted pair interface. This

 

 

 

 

 

status bit is valid regardless of the MAU

 

 

 

MDI-X Status

11

selected.

RO

0b

0b

1b

= PHY has selected MDI-X (crossed

 

 

 

 

 

 

 

over).

 

 

 

 

 

0b

= PHY has selected MDI (NOT

 

 

 

 

 

crossed over).

 

 

 

 

 

 

 

 

 

 

 

 

1b

= PHY currently receiving a packet.

 

 

 

Receive Status

12

0b = PHY receiver is IDLE.

RO

0b

0b

 

 

When in loopback, this bit reads as 0b.

 

 

 

 

 

 

 

 

 

 

Software Developer’s Manual

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