| 摘要 |
<p>PROBLEM TO BE SOLVED: To judge adaptability between an extended card and a slot, and to prevent the occurrence of any failure in the card even when they are not adaptable. SOLUTION: When a card is inserted into a slot 98, a decode logic 200 of a PCI bridge 116 receives data related with a signal level and dock frequencies set in the card, and supplies an error signal indicating that the card and the slot are not adaptable, or a signal indicating that a power level is 5 V or 3.3 V to gates 160 and 162 according to the data. When the card and the slot are not adaptable, power switches 170 and 172 are turned off, and a power is not supplied to the slot. When the set power level is 5 V, the power switch 172 is turned on by the gate 160, and when the set power level is 3.3 V, the power switch 172 is turned on by the gate 162, and the power is supplied to the slot. The clock frequencies are judged, and a proper clock is supplied to the card.</p> |
