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TSB41LV03 Folha de dados(PDF) 3 Page - Texas Instruments

Nome de Peças TSB41LV03
Descrição Electrónicos  IEEE 1394a THREE-PORT CABLE TRANSCEIVER/ARBITER
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Fabricante Electrônico  TI [Texas Instruments]
Página de início  http://www.ti.com
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TSB41LV03 Folha de dados(HTML) 3 Page - Texas Instruments

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TSB41LV03A, TSB41LV03AI
IEEE 1394a THREE-PORT CABLE TRANSCEIVER/ARBITER
SLLS364A – JULY 1999 – REVISED MAY 2000
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description (continued)
When the power supply of the TSB41LV03A is off while the twisted-pair cables are connected, the TSB41LV03A
transmitter and receiver circuitry presents a high-impedance signal to the cable and will not load the TPBIAS
voltage at the other end of the cable.
When the TSB41LV03A is used with one or more of the ports not brought out to a connector, the twisted-pair
terminals of the unused ports must be terminated for reliable operation. For each unused port, the TPB+ and
TPB– terminals can be tied together and then pulled to ground, or the TPB+ and TPB– terminals can be
connected to the suggested termination network. The TPA+ and TPA– and TPBIAS terminals of an unused port
can be left unconnected. The TPBias terminal can be connected to a 1-
µF capacitor to ground or left floating.
The TESTM, SE, and SM terminals are used to set up various manufacturing test conditions. For normal
operation, the TESTM terminal should be connected to VDD, SE should be tied to ground through a 1-kΩ resistor,
while SM should be connected directly to ground.
Four package terminals are used as inputs to set the default value for four configuration status bits in the self-ID
packet, are hardwired high or low as a function of the equipment design. The PC0–PC2 terminals are used to
indicate the default power-class status for the node (the need for power from the cable or the ability to supply
power to the cable). See Table 9 for power-class encoding. The C/LKON terminal is used as an input to indicate
that the node is a contender either isochronous resource manager (IRM) or for bus manager (BM).
The TSB41LV03A supports suspend/resume as defined in the IEEE P1394a specification. The suspend
mechanism allows pairs of directly-connected ports to be placed into a low-power conservation state
(suspended state) while maintaining a port-to-port connection between 1394 bus segments. While in the
suspended state, a port is unable to transmit or receive data transaction packets. However, a port in the
suspended state is capable of detecting connection status changes and detecting incoming TPBias. When all
three ports of the TSB41LV03A are suspended all circuits except the bandgap reference generator and bias
detection circuits are powered down resulting in significant power savings. For additional details of
suspend/resume operation refer to the P1394a specification. The use of suspend/resume is recommended for
new designs.
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.
The CNA (cable-not-active) terminal provides a high when there are no twisted-pair cable ports receiving
incoming bias (i.e., they are either disconnected or suspended), and can be used along with LPS to determine
when to power-down the TSB41LV03A. 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 pull-down is
activated on the RESET terminal so as to force a reset of the TSB41LV03A 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 (see Table 1 and Table 2 in the
APPLICATION INFORMATION section) 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-LCC interface is controlled
solely by the LPS input regardless of the state of the LCtrl bit).


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