| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a physical layer circuit and a data transfer controller, capable of reducing power unnecessarily consumed before connection of a USB cable, and to provide electronic equipment including it. <P>SOLUTION: This physical layer circuit includes: a VBUS detection circuit 100 activating a VBUS detection signal VBDET when a VBUS voltage exceeds a prescribed voltage; a reception circuit 30 performing reception processing by use of signals DP, DM; and a reception control circuit 110 outputting an enable signal to the reception circuit 30. When the signal VBDET is non-active, the reception control circuit 110 non-activates enable signals COMPENB, SEENB1, SEENB2 to bring the reception circuit 30 into a disable state. When the signal VBDET is non-active even if signals FCOMPENB, FSEENB1, FSEENB2 set by a processing part are active, the signals COMPENB, SEENB1, SEENB2 are made to be non-active. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
