8101 datasheet(133/172 Pages) LSI

133 / 172 page

AutoNegotiation

5-7

5.6 AutoNegotiation

AutoNegotiation is a handshake operation between the controller and the

external device (see Section 2.15, “AutoNegotiation”). If the external

device is capable of AutoNegotiation, the procedures described in

Section 5.6.1, “AutoNegotiation at Power Up” should be followed. If the

external device is not capable of AutoNegotiation, refer to Section 5.6.2,

“Negotiating with a Non-AutoNegotiation Capable Device”.

Table 5.3

SerDes Loopback Procedure

STEP

Action

Result

Set the REJALL bit in Register 8 Ignore all receive data until the loopback mode is ready

for operation.

Set the EWRAP bit in Register 9 Enable the external SerDes loopback mode.

Clear the SD_EN bit in Register

Ignore the signal detect output from optical transceiver

because the receive optical data may be invalid.

Set the TBC_DIS bit in Register

Stop transmission of data out of 10-bit PHY interface

which causes the SerDes and controller to lose sync so

that they properly resync to the new data stream.

Wait more than 200

µs

Allow time for the SerDes and controller receivers to lose

sync.

Clear the TBC_DIS bit in

Turn on the transmitter so that the SerDes and controller

receivers can gain sync.

Wait more than 200

µs

Allow time for the SerDes and controller receivers to gain

sync.

Clear the REJALL bit in Register

Stop ignoring receive data and turn on the receive MAC.

Do loopback tests

Clear the EWRAP bit, and set

the SD_EN bit in Register 9 (if

SD pin is used)

Turn off the SerDes loopback mode and enable the signal

detect function (if used).

Set the ANRST bit in Register 7 Restarts AutoNegotiation. Controller is ready for normal

operation when AutoNegotation is completed.

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