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8575
8575
N/B Maintenance
N/B Maintenance
The cable-not-active (CNA) output terminal (64-terminal PAP package only) is asserted high when there are no
twisted-pair cable ports receiving incoming bias (that is, they are either disconnected or suspended), and can be
used along with LPS to determine when to power down the TSB41AB1. The CNA output is not debounced.
When the PD terminal is asserted high, the CNA detection circuitry is enabled (regardless of the previous state
of the ports) and a pulldown is activated on the RESET\ terminal so as to force a reset of the TSB41AB1
internal logic.
The LPS (link power status) terminal works with the C/LKON terminal to manage the power usage in the node.
The LPS signal from the LLC is used in conjunction with the LCtrl bit to indicate the active/power status of the
LLC. The LPS signal is also used to reset, disable, and initialize the PHY-LLC interface (the state of the PHY-
LLC interface is controlled solely by the LPS input, regardless of the state of the LCtrl bit).
The port transmitter and receiver circuitry is disabled during power down (when the PD input terminal is
asserted high), during reset (when the RESET\ input terminal is asserted low), when no active cable is
connected to the port, or when controlled by the internal arbitration logic. The TPBIAS output is disabled
during power down, during reset, or when the port is disabled as commanded by the LLC.
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