PCI7621 Datasheet, PDF (237/298 Pages) Texas Instruments – DUAL SINGLE SOCKET CARDBUS AND ILTRAMEDIA CONTROLLER WITH INTEGRATED 1304-A - CONTROLLER WITH DEDICATED FLASH MEDIA SOCKET

10.5 Power-Class Programming
The PC0–PC2 terminals are programmed to set the default value of the power-class indicated in the pwr field
(bits 21–23) of the transmitted self-ID packet. Table 10−9 shows the descriptions of the various power classes. The
default power-class value is loaded following a system (hardware) reset, but is overridden by any value subsequently
loaded into the Pwr_Class field in register 4.
PC0–PC2
000
001
010
011
100
101
110
111
Table 10−9. Power Class Descriptions
DESCRIPTION
Node does not need power and does not repeat power.
Node is self-powered and provides a minimum of 15 W to the bus.
Node is self-powered and provides a minimum of 30 W to the bus.
Node is self-powered and provides a minimum of 45 W to the bus.
Node may be powered from the bus and is using up to 3 W. No additional power is needed to enable the link.
Reserved
Node is powered from the bus and uses up to 3 W. An additional 3 W is needed to enable the link.
Node is powered from the bus and uses up to 3 W. An additional 7 W is needed to enable the link.
10−7