ELANSC520 datasheet(18/440 Pages) AMD

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Introduction

xviii

Élan™SC520 Microcontroller Register Set Manual

DOCUMENTATION CONVENTIONS

Table 0-1 lists the documentation conventions used throughout this manual.

Table 0-1

Documentation Notation

Notation

Meaning

Reset Default Values

Default

Value after a system reset

0Low

Active or High

No value is guaranteed

Determined by sources external to the ÉlanSC520

microcontroller

Read/Write Attributes

The bit field is read-only. A write to the register at this bit field

has no effect. The contents may or may not be changed by

hardware.

The bit field is write-only. Reading this register at this bit field

does not return a meaningful value and has no side effects.

R/W

The bit field is read/write. Reading the register at this bit field

always returns the last value written. Reads have no side effects.

R/W!

The bit field is read/write with conditions. The “!” indicates that

there are side effects to using this bit. For example, reading a

bit or register might not always return the last value written. Note

that both reads and writes can have side effects. If you see a

“!”, be sure to read the bit description and programming notes.

RSV

The bit field is reserved for internal test/debug or future

expansion. This bit field should be written to 0 for normal system

operation. This bit field always returns 0 when read.

RSV!

The bit field is reserved for compatibility purposes. For example,

the bit field might be ignored during writes to maintain software

compatibility. If you see a “!”, be sure to read the bit description

and programming notes.

Reference Notation

MMCR offset 00h

ÉlanSC520 microcontroller Memory-Mapped Configuration

Region (MMCR) offset register 00h

PCI index 00h

PCI indexed register 00h

Port 00h

Direct-mapped I/O register 00h

RTC index 00h

RTC and configuration RAM indexed register 00h

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