| 摘要 |
Relay buffers 600, 601, 602, and 603 in a computer module 110 and an I/O module 120 each have a noise filter circuit for determining the amplitude of a signal to/from PCIe interfaces 161 and 162 to distinguish a signal from noise and controlling ON/OFF of output signals. An I/O hub 300 and a PCIe switch 400 make a switch between enablement and disablement of the noise filter circuits in the relay buffers according to communication mode, and disables the noise filter circuits when communication is performed at a high rate. Cable removal detecting circuits 115 and 125 notify the I/O hub 300 and the PCIe switch 400 of a removal of a PCIe cable 151 to prevent a malfunction caused by noise that results from a PCI glitch.
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