The Enhanced PCI-IDE Interface is a single-chip controller packaged in a 100-pin PQFP It provides 2 IDE channels for interfacing up to 4 IDE drives or 2 IDE drives and CD-ROM directly on the PCI Local bus An enhanced DMA controller on-chip increases system performance by providing full scatter gather data transfers between IDE devices and system memory without CPU intervention Four levels of both write posting and read prefetching per channel allow the host CPU to run concurrently with IDE cycles Programmable timing functions provide maximum flexibility of timing parameters per drive for optimizing the data transfer rate per drive Both PC compatible addressing and PCI compliant addressing are supported by re-mapping the base addresses A power control feature allows turning off power to the IDE cables