Product Description
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NOTES
• Computer systems that have an unshielded cable attached to a USB port may not meet FCC
Class B requirements, even if no device is attached to the cable. Use shielded cable that meets
the requirements for full-speed devices.
• USB 2.0 support has been tested with Windows 2000 and Windows XP drivers and is not
currently supported by any other operating system.
For information about Refer to
The location of the USB connectors on the back panel Figure 11, page 52
The signal names of the back panel USB connectors Table 18, page 53
The location of the front panel USB connector Figure 15, page 68
The signal names of the front panel USB connector Table 46, page 69
The front panel, EHCI, UHCI, and USB specifications Section 1.4, page 17
1.7.3 IDE Support
1.7.3.1 IDE Interfaces
The ICH4’s IDE controller has two independent bus-mastering IDE interfaces that can be
independently enabled. The IDE interfaces support the following modes:
• Programmed I/O (PIO): processor controls data transfer.
• 8237-style DMA: DMA offloads the processor, supporting transfer rates of up to 16 MB/sec.
• Ultra DMA: DMA protocol on IDE bus supporting host and target throttling and transfer rates
of up to 33 MB/sec.
• ATA-66: DMA protocol on IDE bus supporting host and target throttling and transfer rates of
up to 66 MB/sec. ATA-66 protocol is similar to Ultra DMA and is device driver compatible.
• ATA-100: DMA protocol on IDE bus allows host and target throttling. The ICH4’s ATA-100
logic can achieve read transfer rates up to 100 MB/sec and write transfer rates up to 88 MB/sec.
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NOTE
ATA-66 and ATA-100 are faster timings and require a specialized cable to reduce reflections,
noise, and inductive coupling.
The IDE interfaces also support ATAPI devices (such as CD-ROM drives) and ATA devices using
the transfer modes listed in Section 4.4.4.1 on page 106.
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.
The Desktop Board D845PEBT2 supports Laser Servo (LS-120) diskette technology through the
IDE interfaces. The BIOS supports booting from an LS-120 drive.
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