Compaq dc7100 HP Compaq dc71xx and dx61xx Series Business Desktop Computers Te - Page 87
ch5, 1 Introduction, 2 PATA/SATA Interfaces
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5 Input/Output Interfaces 5.1 Introduction This chapter describes the standard (i.e., system board) interfaces that provide input and output (I/O) porting of data and specifically discusses interfaces that are controlled through I/O-mapped registers. The following I/O interfaces are covered in this chapter: ■ PATA/SATA interface (5.2), page 5-1 ■ Diskette drive interface (5.3), page 5-7 ■ Serial interfaces (5.4), page 5-12 ■ Parallel interface (5.5), page 5-14 ■ Keyboard/pointing device interface (5.6), page 5-18 ■ Universal serial bus interface (5.7), page 5-25 ■ Audio subsystem (5.8), page 5-29 ■ Network interface controller (5.9), page 5-36 5.2 PATA/SATA Interfaces These systems provide both legacy EIDE (i.e., parallel ATA or PATA) and serial ATA (SATA) interfaces. All systems are shipped configured with SATA hard drives. One 40-pin IDE connector is included on the system board. The controller can be configured for the following modes of operation: ■ Programmed I/O (PIO) mode-CPU controls drive transactions through standard I/O mapped registers of the IDE drive. ■ 8237 DMA mode-CPU offloads drive transactions using DMA protocol with transfer rates up to 16 MB/s. ■ Ultra ATA/100 mode-Preferred bus mastering source-synchronous protocol providing transfer rates of 100 MB/s. IDE Programming The IDE interface is configured as a PCI device during POST and controlled through I/O-mapped registers at runtime. Non-DOS (non-Windows) operating systems may require using Setup (F10) for drive configuration. Technical Reference Guide 361834-002 5-1