TSB41BA3APFP datasheet(27/66 Pages) TI

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TSB41BA3A

IEEE 1394b THREEPORT CABLE TRANSCEIVER/ARBITER

SLLS618B − JUNE 2004 − REVISED AUGUST 2004

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

APPLICATION INFORMATION

power-class programming

The S2_PC0, S1_PC1, and S2_PC2 terminals can be used in some port speed/mode selections to set the

default value of the power-class indicated in the pwr field (bits 21−23) of the transmitted self-ID packet.

Descriptions of the various power-classes are given in Table 10. The default power-class value is loaded

following a hardware reset, but is overridden by any value subsequently loaded into the Pwr_Class field in

Table 10. Power Class Descriptions

PC0−PC2

DESCRIPTION

000

Node does not need power and does not repeat power.

001

Node is self-powered and provides a minimum of 15 W to the bus.

010

Node is self-powered and provides a minimum of 30 W to the bus.

011

Node is self-powered and provides a minimum of 45 W to the bus.

100

Node may be powered from the bus and is using up to 3 W, no additional power is needed to enable the link. The node may also

provide power to the bus. The amount of bus power that it provides can be found in the configuration ROM.

101

Reserved for future standardization.

110

Node is powered from the bus and uses up to 3 W. An additional 3 W is needed to enable the link.

111

Node is powered from the bus and uses up to 3 W. An additional 7 W is needed to enable the link.

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