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DP83865

2.0 Register Block (Continued)

Table 16. Link and Auto-Negotiation Status Register (LINK_AN) address 0x11 (17’d)

Bit Bit Name Default Description

15:12 TP Polarity[3:0] 0, RO Twisted Pair Polarity Status: Indicates a polaritiy reversal on

pairs A to D ([15:12]). The PHY automatically detects this condi-

tion and adjusts for it.

1 = polarity reversed

0 = normal operation

11 Reserved

(Power Down Status)

0, RO Write as 0, ignore on read.

This bit is set to indicate that the PHY is in power down mode.

10 MDIX Status 0, RO MDIX Status: Indicates whether the PHY’s MDI is in straight or

cross-over mode.

1 = Cross-over mode

0 = Straight mode

9 FIFO Error 0, RO Transmit FIFO Error: Indicates whether a FIFO overflow or un-

derrun has occured. This bit is cleared every time link is lost.

1 = FIFO error occured

0 = normal operation

8 Reserved 0, RO Write as 0, ignore on read.

7 Shallow Loopback

Status

0, RO Shallow Loopback Status: (As set by bit 5, register 0x12)

1 = The PHY operates in shallow loopback mode

0 = Normal operation

6 Deep Loopback

Status

0, RO Deep Loopack Status: (As set by bit 14, register 0x00)

1 = The PHY operates in deep loopback mode

0 = Normal operation

5 Non-Compliant

Mode Status

0, RO Non-compliant Mode Status:

‘1’ detects only in non-compliant mode

‘0’ detects in both IEEE compliant and non-compliant mode

4:3 Speed[1:0] Status STRAP[00], RO Speed Resolved: These two bits indicate the speed of operation

as determined by Auto-negotiation or as set by manual configu-

ration.

Speed[1]

Speed[0] Speed of operation

1 0 = 1000 Mbps

0 1 = 100 Mbps

0 0 = 10 Mbps

1 1 = reserved

2 Link Status 0, RO Link status:

1 = indicates that a good link is established

0 = indicates no link.

1 Duplex Status 0, RO Duplex status:

1 = indicates that the current mode of operation is full duplex

0 = indicates that the current mode of operation is half duplex

0Master/Slave

Config. Status

0, RO Master / Slave Configuration Status:

1 = PHY is currently in Master mode

0 = PHY is currently in Slave mode