Intel DG41TX English Product Guide - Page 20

Intel Desktop Board DG41TX Product Guide Hi-Speed USB 2.0 Support The Desktop Board supports up to eight USB 2.0 ports (four ports routed to the back panel and four ports routed to three internal headers) via ICH7. USB 2.0 ports are backward compatible with USB 1.1 devices. USB 1.1 devices will function normally at USB 1.1 speeds. USB 2.0 support requires both an operating system and drivers that fully support USB 2.0 transfer rates. Disabling Hi-Speed USB in the BIOS reverts all USB 2.0 ports to USB 1.1 operation. This may be required to accommodate operating systems that do not support USB 2.0. ATA Support The board includes five ATA interface connectors: • One PATA connector that supports two devices • Four SATA connectors that support one device each PATA Interface The board's discrete PATA controller provides one bus-mastering PATA interface that is accessible through a standard PATA (IDE) connector. The PATA interface supports the following modes: • Programmed I/O (PIO): the processor controls data transfer. • 8237-style DMA: DMA offloads the processor, supporting transfer rates of up to 16 MB/s. • Ultra DMA: DMA protocol on the ATA bus supporting host and target throttling and transfer rates of up to 33 MB/s. • ATA-66: DMA protocol on the ATA bus supporting host and target throttling and transfer rates of up to 66 MB/s. ATA-66 protocol is similar to Ultra DMA and is device driver compatible. • ATA-100: DMA protocol on the ATA bus allows host and target throttling. NOTE ATA-66 and ATA-100 are faster timings and require a specialized cable to reduce reflections, noise, and inductive coupling. The PATA interface also supports ATAPI devices (such as CD-ROM drives) and ATA devices using the transfer modes. The BIOS supports Logical Block Addressing (LBA) and Extended Cylinder Head Sector (ECHS) translation modes. The drive reports the transfer rate and translation mode to the BIOS. 20