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TSB83AA23

SLLS787 – AUGUST 2007

The PHY section uses the LKON terminal to notify the LLC section to power up and become active. When

activated, the output LKON signal is a square wave. The PHY section activates the LKON output when the LLC

section is inactive and a wake-up event occurs. The LLC section is considered inactive when either the LPS

input is inactive, as previously described, or the LCtrl bit is cleared to 0. A wake-up event occurs when a link-on

PHY packet addressed to this node is received, or conditionally when a PHY interrupt occurs. The PHY section

deasserts the LKON output when the LLC section becomes active (both LPS sensed as active and the LCtrl bit

set to 1). The PHY section also deasserts the LKON output when a bus reset occurs, unless a PHY interrupt

condition exists, which would otherwise cause LKON to be active. If the TSB83AA23 is power cycled and the

power class is 0 through 4, the PHY section asserts LKON for approximately 167

μs or until both the LPS is

active and the LCtrl bit is 1.

Copyright © 2007, Texas Instruments Incorporated

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