MPC8540 datasheet(726/1302 Pages) FREESCALE

726 / 1302 page

MPC8540 PowerQUICC III Integrated Host Processor Reference Manual, Rev. 1

14-100

Freescale Semiconductor

Three-Speed Ethernet Controllers

14.5.4.9 Extended Status Register (EXST)

Figure 14-107 shows the EXST register.

Table 14-107 describes the fields of the EXST register.

Msg Page

Message page

0 Unformatted page

1 Message page

Ack2

Acknowledge 2. Indicates the link partner’s ability to comply with the message

0 Link partner cannot comply with message

1 Link partner complies with message

Toggle

Toggle. Used to ensure synchronization with the link partner during next page exchange. This bit

always takes the opposite value of the toggle bit of the previously-exchanged link code word. The

initial value in the first next page transmitted is the inverse of bit 11 in the base link code word.

This bit is read-only.

0 Toggle bit of the previously-exchanged link code word was set

1 Toggle bit of the previously-exchanged link code word was clear

5–15

Message/

Unformatted

Code Field

Message pages are formatted pages that carry a pre-defined message code, which is

enumerated in IEEE 802.3u/Annex 28C. Unformatted code fields take on an arbitrary value.

R 1000X

Full

1000X

Half

1000T

Full

1000T

Half

0000

Reset

1010_0000_0000_0000

Offset

TBIPA offset + 0x0F

Figure 14-107. Extended Status Register Definition

Table 14-107. EXST Field Descriptions

Bits

Name

Description

1000X Full 1000X full-duplex capability. Returns 1 on read. This bit is read-only.

0 PHY cannot operate in 1000BASE-X full-duplex mode

1 PHY can operate in 1000BASE-X full-duplex mode

1000X Half 1000X half-duplex capability. Returns 0 on read. This bit is read-only.

0 PHY cannot operate in 1000BASE-X half-duplex mode

1 PHY can operate in 1000BASE-X half-duplex mode

1000T Full 1000T full-duplex capability. Returns 1 on read. This bit is read-only.

0 PHY cannot operate in 1000BASE-T full-duplex mode

1 PHY can operate in 1000BASE-T full-duplex mode

Table 14-106. ANLPANP Field Descriptions (continued)

Bits

Name

Description

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