The MC143421 PCI Bus Interface chip is a low cost and highly integrated PCI interface solution that includes Advanced Configuration Power Interface (ACPI) features. It is designed to enable the addition of a PCI interface to PC peripherals such as DSPbased analog modems. The Peripheral Interface Bus (PIB) that interfaces this device to the PC peripheral function provides four address lines, bytewide data, and eight programmable lines that can be used for chip selects, interrupts, and powerdown enable.