| 摘要 |
On a commercial product mounting substrate 100, an IEEE1394 controller LSI 101 and CPU 103 which controls the IEEE1394 controller LSI 101 are mounted. A built-in PHY 102 having two ports is mounted on the IEEE1394 controller LSI 101 . In addition, an external PHY 105 having three ports is also mounted on the commercial product mounting substrate 100 . One port of the built-in PHY 102 and one port of the external PHY 105 are connected with each other by wiring on the commercial product mounting substrate 100 . Remaining one port of the built-in PHY 102 and remaining two ports of the external PHY 105 are connected to connectors A, B and C, respectively, by wiring on the commercial product mounting substrate 100 , and as a result, the number of connectors of a commercial product becomes three.
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