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Intel® I/O Controller Hub 7 (ICH7) / Intel® High Definition Audio / AC'97 Programmer's Reference Manual (PRM)
For the Intel® 82801GB ICH7 and 82801GR ICH7R I/O Controller Hubs
The Intel® High Definition Audio controller resides in PCI Device 27, Function 0 on bus 0. This function contains a set of DMA engines that are used to move samples of digitally encoded data between system memory and external codecs.
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