參數(shù)資料
型號(hào)： TSB81BA3I
廠商： Texas Instruments, Inc.
英文描述： IEEE 1394b THREE-PORT CABLE TRANSCEIVER/ARBITER
中文描述： 的IEEE 1394b三端口電纜收發(fā)器/仲裁者
文件頁(yè)數(shù)： 21/57頁(yè)
文件大?。?/td> 810K
代理商： TSB81BA3I
SLLS559B DECEMBER 2002 REVISED OCTOBER 2003
21
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
power-class programming
The PC0PC2 terminals are programmed to set the default value of the power-class indicated in the pwr field
(bits 2123) of the transmitted self-ID packet. Descriptions of the various power-classes are given in Table 9.
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 register 4.
Table 9. Power Class Descriptions
PC0PC2
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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