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TSB41AB2PAPRG4 データシート(PDF) 3 Page - Texas Instruments

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部品番号 TSB41AB2PAPRG4
部品情報  IEEE 1394a-2000 TWO-PORT CABLE TRANSCEIVER/ARBITER
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TSB41AB2, TSB41AB2I
IEEE 1394a2000 TWOPORT CABLE
TRANSCEIVER/ARBITER
SLLS424G − JUNE 2000 − REVISED DECEMBER 2004
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description (continued)
connected to the twisted-pair-B terminals is coupled to ground through a parallel R-C network with
recommended values of 5 k
Ω and 220 pF. The values of the external line termination resistors are designed
to meet the standard specifications when connected in parallel with the internal receiver circuits. An external
resistor connected between the R0 and R1 terminals sets the driver output current, along with other internal
operating currents. This current setting resistor has a value of 6.34 k
Ω ±1.0%.
When the power supply of the TSB41AB2 is off while the twisted-pair cables are connected, the TSB41AB2
transmitter and receiver circuitry presents a high impedance to the cable and does not load the TPBIAS voltage
at the other end of the cable. Fail-safe circuitry blocks any leakage path from the port back to the device power
plane.
When the TSB41AB2 is used with one of the ports not brought out to a connector, the twisted-pair terminals of
the unused port must be terminated for reliable operation. For each unused port, the TPB+ and TPB− terminals
should be tied together and then pulled to ground through a 1-k
Ω resistor, or the TPB+ and TPB− terminals
should be connected to the suggested termination network. The TPA+ and TPA− terminals of an unused port
may be left unconnected. The TPBIAS terminal should 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 through a 1-kΩ resistor, SE should be tied to ground
through a 1-k
Ω resistor, and 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, and are tied high through a 1-k
Ω resistor or hardwired 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 for either isochronous resource manager
(IRM) or bus manager (BM).
The TSB41AB2 supports suspend/resume as defined in IEEE 1394a-2000 specification. The suspend
mechanism allows pairs of directly-connected ports to be placed into a low-power state (suspended state) while
maintaining a port-to-port connection between 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 ports of the TSB41AB2 are suspended, all
circuits except the band gap reference generator and bias detection circuits are powered down, resulting in
significant power savings. For additional details of suspend/resume operation see IEEE 1394a-2000. 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 cable-not-active (CNA) output terminal 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 TSB41AB2. 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 to force a reset of the TSB41AB2 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-LLC interface is controlled solely by the LPS input
regardless of the state of the LCtrl bit).


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