View ucb1500-03 datasheet:

UCB1500 PCI to AC97 bridge/host controller Rev. 03 — 7 July 2000 Product specification 1. General description UCB1500 is a PCI-to-AC97 Bridge/Host Controller for modem or audio codecs equipped with the AC-link interface. It integrates a PCI 2.2 interface for communication with the host PC, with built in support for PPMI (PCI Power Management Interface) and wake-up. It also integrates an AC97 Rev. 2.1 host controller for connection to up to two AC-Link codecs, including analog modem front ends such as the Philips UCB1510, and audio codecs. dth OPTIONAL EEPROM phone PCI AC97 DAA line interface interface HOST PC UCB1500 UCB1510 GPIO MBL144 Fig 1. Application with Philips UCB1510 analog modem front end c c 2. Features 32-bit PCI 2.2 interface with bus master support