8101 datasheet(59/172 Pages) LSI

59 / 172 page

AutoNegotiation

2-41

Transmit‚" Section 4.3.20, in order to be transmitted. The next pages

received from the remote station are stored in “Register 24–

AutoNegotiation Next Page Receive‚" Section 4.3.21. Both stations must

have the next page functionality for a successful next page transfer. Next

page operation is complicated; refer to IEEE 802.3z for a full description

of how this feature works and to Chapter 4, Registers for a description

of the associated registers.

There are status bits related to next page operation. See Section 2.15.2,

“Negotiation Status” for details.

2.15.2 Negotiation Status

There are bits in “Register 11–Status 1‚" Section 4.3.12, that indicate the

status of AutoNegotiation. These bits are summarized in Table 2.12 and

are described in more detail in the Status 1 register description. Some

of the bits related to AutoNegotiation can be programmed to cause an

interrupt, as described in the Status 1 register description.

2.15.3 AutoNegotiation Restart

Setting the ANRST bit in “Register 7–Conﬁguration 1‚" Section 4.3.8,

restarts the AutoNegotiation algorithm. The ANRST bit clears itself

automatically after the AutoNegotiation process starts transmitting /C/

ordered sets.

Table 2.12

AutoNegotiation Status Bits

Bit No.

Bit Name

What Bit Indicates

LINK

Link is up, autoNegotiation has completed

AN_NP

One TX and one RX next page has been

exchanged

AN_TX_NP

One next page has been transmitted

AN_RX_NP

One next page has been received

AN_RX_BP

Base page has been received

AN_RMTRST

AutoNegotiation was restarted by remote

station

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