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8575
8575
N/B Maintenance
N/B Maintenance
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 V
DD
through a 1kΩ resistor, SE should be tied to
ground through a 1kΩ 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 1kΩ resistor or hardwired low as a function of the equipment design.
The PC0 C2 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 for bus manager (BM).
The TSB41AB1 supports suspend/resume as defined in the 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 the port of the TSB41AB1 is suspended, all
circuits except the band gap reference generator and bias detection circuit is 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.
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