HP Workstation x2000 hp workstation x2000 - Technical Reference and Troublesho - Page 58

System Board The Input/Output Controller Hub 2 (82801BA) AC'97 Controller The AC'97 controller is a single-chip CS4299 audio controller that provides full audio features for the x2000 Workstation. For information about the CS4299 audio solution, see page 60. IDE Controller The IDE controller is implemented as part of the ICH2 chip and has PCI-Master capability. Two independent ATA/100 IDE channels are provided with two connectors per channel. You can connect two IDE devices (one master and one slave) per channel. To guarantee data transfer integrity, you must use Ultra-ATA cables for Ultra-ATA modes (Ultra-ATA/33, Ultra-ATA/66, and Ultra-ATA/100). The PIO IDE transfers as fast as 14MB/sec, and the system supports Bus Master IDE transfer rates of as fast as 66MB/sec. The IDE controller integrates 16 x 32-bit buffers for optimal transfers. You can mix a fast and a slow device (for example, a hard disk and a CD-ROM) on the same channel without affecting the performance of the faster device. The BIOS automatically determines the fastest configuration that each device supports. DMA Controller The seven-channel DMA controller incorporates the functionality of two 82C37 DMA controllers. Channels zero to three are for 8-bit count-by-byte transfers, whereas channels five to seven are for 16-bit count-by-word transfers. (For allocated DMA channel allocations, see the table on page 93.) You can program any two of the seven DMA channels to support fast Type-F transfers. The ICH2 DMA controller supports the LPC DMA. The LPC interface supports Single, Demand, Verify, and Incremental modes. Channels zero to three are 8-bit, whereas channels five to seven are 16-bit. Channel four is reserved as a generic bus master request. 58 Chapter 2