HP dc71xx Manuale Utente

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

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.

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.