L80223 LSI, L80223 Datasheet - Page 53

• Manufacturer Part Number: L80223
• Manufacturer: LSI

Specifications of L80223

• Lead Free Status / RoHS Status: Not Compliant

2.6.3.2 Diagnostic Loopback
2.7 10/100 Mbits/s Selection
2.7.1 Forcing 10/100 Mbits/s Operation
2.7.2 Autoselecting 10/100 Mbits/s Operation
mode, and in the Link Fail State. In 10 Mbits/s mode, internal CRS
loopback is also disabled when jabber is detected.
Setting the loopback bit (LPBK) in the MI serial port Control register
selects the diagnostic loopback mode. When diagnostic loopback is
enabled, the TXD[3:0] data is looped back onto RXD[3:0], TX_EN is
looped back onto CRS, RX_DV operates normally, the TP receive and
transmit paths are disabled, the transmit link pulses are halted, and the
Half-/Full-Duplex modes do not change.
The device can be forced into either the 10 or 100 Mbits/s mode, or it
can use AutoNegotiation to autoselect 10 or 100 Mbits/s operation.
To independently force each channel into either the 10 Mbits/s or 100
Mbits/s mode
The device can automatically configure itself for 10 or 100 Mbits/s mode.
To do this, it uses the AutoNegotiation algorithm to advertise and detect
10 and 100 Mbits/s capabilities to and from a remote device. Setting the
AutoNegotiation Enable (ANEG_EN) bit in the MI serial port Control
register enables AutoNegotiation. Appropriately setting the bits in the MI
serial port AutoNegotiation Advertisement register selects the advertised
speed capability. AutoNegotiation functionality is described in more detail
in
10/100 Mbits/s Selection
Section 2.3.10, “Link Integrity and
clear the ANEG_EN bit in the MI serial port Control register, and
set the Speed Select (SPEED) bit in the MI serial port Control
register
Copyright © 2000, 2001, 2002 by LSI Logic Corporation. All rights reserved.
AutoNegotiation”.
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