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TSB41LV03AI Datasheet(PDF) 3 Page - Texas Instruments |
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TSB41LV03AI Datasheet(HTML) 3 Page - Texas Instruments |
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3 / 50 page  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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