PATHADC Home > Documentation > Hardware > Power Mac G4 Developer Note

   

---

DMA Support

The KeyLargo IC provides DB-DMA (descriptor-based direct memory access) support for the following I/O channels:

• Ultra DMA/66 interface

• EIDE interface

• communication slot interface

• DAV channel to the sound IC

The DB DMA system provides a scatter-gather process based on memory-resident data structures that describe the data transfers. The DMA engine is enhanced to allow bursting of data files for improved performance.