8101 Datasheet, PDF (134/172 Pages) LSI Computer Systems – Gigabit Ethernet Controller

5.6.1 AutoNegotiation at Power Up
When the device is powered up the AutoNegotiation algorithm must
handshake with the remote device to configure itself for a common mode
of operation. To insure smooth and proper AutoNegotiation operation at
power up it is recommended that the procedure outlined in Table 5.4 be
followed.
Table 5.4 AutoNegotiation Power Up Procedure
STEP Action
Result
1
Wait for the SD pin to go HIGH (If Waits for valid data from the optical transceiver.
SD is not used, go to the next step.)
2
Set RST bit in Register 7
Resets the device.
3
Set bits [15:0] in Register 21
Sets up the capabilities for AutoNegotiation.
4
Set the remaining
register bits as needed.
Sets up the device for the desired operation.
5
Set ANRST bit in Register 7
Restarts AutoNegotiation.
6
Wait > 50 µs
Wait for AutoNegotiation to complete.
7
Read LINK bit in register 11 twice. If Determine if AutoNegotiation done and link pass. If
0, then done. If 1, repeat #5–7
link pass, device ready for operation. If link fail, retry
(up to seven times).
again seven more times. If no link pass after seven
times, disable ANEG and try manual link pass.
8
Clear AN_EN bit in Register 9
Disable AutoNegotiation.
9
Clear ANRST bit in Register 7
Clears all internal AutoNegotiation circuitry.
10
Wait > 100 µs
Wait for manual link pass.
11 Read LINK bit in Register 11 twice. If manual link pass, then device ready for operation. If
If 0, go to first step. If 1, done.
link fail, then redo procedure until link pass is
achieved.
5-8
Application Information
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