PC87591L datasheet(23/437 Pages) NSC

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1.0

Introduction

1.1

DOCUMENT ORGANIZATION

This document describes the PC87591x architecture and device specifications. It is organized as follows:

Chapter 1, Introduction, provides an overview of PC87591x modules, system connections, operating modes and conﬁgura-

tion.

Chapter 2, Signal/Pin Description and Conﬁguration, lists the PC87591x pins and describes their functions and multiplex-

ing options.

Chapter 3, Power, Reset and Clocks, describes the PC87591x power supplies, clock scheme and reset sequence.

Chapter 4, Embedded Controller Modules, describes the modules that comprise the CompactRISC core peripherals.

Chapter 5, Host Controller Interface Modules, describes the modules and functions that interface core operation with the

host.

Chapter 6, Host-Controlled Modules and Host Interface, deﬁnes the conﬁguration and control functions.

Chapter 7, Device Speciﬁcations, deﬁnes the AC, DC and analog characteristics of the PC87591x.

Appendix A, Summary of Registers, provides a composite listing of all relevant data on core domain registers and summa-

rizes the registers’ layouts.

Appendix B, This section includes directions for the software to handle some predetermined hardware interfaces and pro-

vides details of software-to-hardware interface conventions.

1.2

GENERAL DESCRIPTION

The PC87591x is a highly integrated, embedded controller with an embedded RISC core and system functions. Targeted

for a wide range of portable applications that use the Low Pin Count (LPC) interface, it also features a security system and

host BIOS firmware.

1.2.1

System Connections

Figure 1 shows the system connections of the PC87591x in a typical mobile PC application. The PC87591x requires little, if

any, system glue elements. For a typical application, the PC87591x includes all required memory and peripherals on-chip.

For more complex applications, it allows simple low-cost expansion, using its bus. Some of the features illustrated are mu-

tually exclusive, depending on pin functions.

The major elements of the PC87591x are:

●

Embedded Controller (EC) functions, which include: PS/2 devices, keyboard matrix, ACCESS.bus, timers, D/A and

A/D converters and GPIO pins that can be assigned to various functions, as needed. External memory and peripheral

devices may be added to extend the functionality of the on-chip resources.

●

Host Processor interface based on the LPC bus and additional signals for interrupts and system power management

●

Power Supplies for Host interface functions, EC and backup battery

●

Clocks, using a 32.768 KHz crystal and optional clock output

●

Strap inputs to initialize the PC87591x to different operation modes

In addition to the wide range of internal peripherals, the PC87591x provides hooks so that the system can be expanded in

an easy and cost-effective manner, as follows:

●

I/O expansion to support additional I/O port pins, using low-cost, standard 74HCxx devices or ASICs

●

On-chip memories may be expanded to interface with external RAM, ﬂash or ROM devices (176-pin package only).

1.2.2

Power Management

The PC87591x has an advanced power management scheme controlled by the host and/or the PC87591x firmware. The

supported SuperI/O functions may be controlled directly by the host, using ACPI compliant schemes. The EC may also in-

terface with the host via one or two communication channels. Power Management events are available for ACPI-compliant

operation with the respective parts of the host chipset.

The PC87591x is designed to operate as the embedded controller of an ACPI-compliant system. It is equipped with various

system power monitor and control functions and advanced means to control its own power consumption and power modes.

ACPI-compliant wake-up and sleep control is integrated into the PC87591x. These functions are powered by VCC.

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