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TSB81BA3EIPFP датащи(PDF) 4 Page - Texas Instruments

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номер детали TSB81BA3EIPFP
подробное описание детали  IEEE 1394b THREE-PORT CABLE TRANSCEIVER/ARBITER
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TSB81BA3EIPFP датащи(HTML) 4 Page - Texas Instruments

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TSB81BA3E
SLLS783A – MAY 2009 – REVISED MAY 2010
www.ti.com
The LPS (link power status) terminal works with the LKON/DS2 terminal to manage the power usage in the node.
The LPS signal from the LLC is used with the LCtrl bit (see Table 1 and Table 2 in the Application Information
section) to indicate the active/power status of the LLC. The LPS signal also resets, disables, and initializes the
PHY-LLC interface (the state of the PHY-LCC interface is controlled solely by the LPS input regardless of the
state of the LCtrl bit).
The LPS input is considered inactive if it remains low for more than the LPS_RESET time (see the LPS terminal
definition) and is considered active otherwise. When the TSB81BA3E detects that the LPS input is inactive, the
PHY-LLC interface is placed into a low-power reset state in which the CTL and D outputs are held in the logic 0
state and the LREQ input is ignored; however, the PCLK output remains active. If the LPS input remains low for
more than the LPS_DISABLE time (see the LPS terminal definition), then the PHY-LLC interface is put into a
low-power disabled state in which the PCLK output is also held inactive. The TSB81BA3E continues the
necessary repeater functions required for normal network operation regardless of the state of the PHY-LLC
interface. When the interface is in the reset or disabled state and the LPS input is again observed active, the
PHY initializes the interface and returns to normal operation. The PHY-LLC interface is also held in the disabled
state during hardware reset. When the LPS terminal is returned to an active state after being sensed as having
entered the LPS_DISABLE time, the TSB81BA3E issues a bus reset. This broadcasts the node self-ID packet,
which contains the updated L bit state (the PHY LLC now being accessible).
The PHY uses the LKON/DS2 terminal to notify the LLC to power up and become active. When activated, the
output LKON/DS2 signal is a square wave. The PHY activates the LKON/DS2 output when the LLC is inactive
and a wake-up event occurs. The LLC is considered inactive when either the LPS input is inactive, as described
above, 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 deasserts the LKON/DS2 output when
the LLC becomes active (both LPS sensed as active and the LCtrl bit set to 1). The PHY also deasserts the
LKON/DS2 output when a bus reset occurs, unless a PHY interrupt condition exists, which would otherwise
cause LKON/DS2 to be active. If the PHY is power cycled and the power class is 0 through 4, then the PHY
asserts LKON/DS2 for approximately 167 ms or until both the LPS is active and the LCTRL bit is 1.
4
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