Its also known as ICH (Input Output Controller Hub). It is the another controller chip on the motherboard which controls the slower devices like PCI, USB, IDE, BIOS etc.
Asynchronous &is any data transmission that does not link the two devices with a common data clock. A Signal called a start bit is sent at the beginning of each segment, & a signal called a stop bit is sent at the end, these let the receiving device note the baundries(beginning & end) of a transmission packet. Early PC modems were almost Asynchronous devices operating at speeds of no more than 18,000 bps.
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