Input/Output Interfaces; Introduction; Eide Interfaces - HP Compaq dc7600 MT Technical Reference Manual

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 5-30
■
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.
5.2.1 PATA Interface
The USDT form factor includes an IDE (PATA) interface as part of the MultiBay interface. The
SFF, ST, MT, and CMT form factors include one 40-pin IDE connector 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

Input/Output Interfaces

www.hp.com
5
5-1