Technical Reference Guide 361834-002 5-1
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.
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