The Intel 430HX PCIset is comprised of two components: the 82439HX System Controller (TXC) in a 324 BGA package; and the 82371SB PCI ISA IDE Accelerator (PIIX3) in a 208-pin PQFP. BGA permits OEMs and motherboard manufacturers to achieve a more compact design or integrate additional features without increasing the size of the motherboard.
The Intel 430HX and 430VX PCIsets include a host-PCI bridge that provides functions such as a 64-bit host bus interface, a 32-bit PCI interface, a 64-bit main memory interface, a write-back second-level cache interface, a host and PCI address decoder and bus arbiter.
The 82371SB provides the bridge between the PCI bus and the ISA expansion bus and also serves as the PCI Bus Master IDE controller. It integrates functions found in ISA-based PC systems with a fast local-bus interface plus serves as a PCI USB host controller interface and as the interface for two USB ports.