TMPR4955AF datasheet(43/168 Pages) TOSHIBA

43 / 168 page

Chapter 1 Introduction

1-1

Chapter 1.

Introduction

1.1

Overview

The TMPR4955A (to be called “TX4955A” hereinafter) is a standard microcontroller of 64-bit

RISC Microprocessor TX49 family.

The TX4955A uses the TX49/H2 Processor Core as the CPU. The TX49/H2 Processor Core is a

64-bit RISC CPU core Toshiba developed based on the R4000 architecture of MIPS Technologies,

Inc (“MIPS”). In addition to its TX49/H2 core with Floating Point Unit (“FPU”), the TX4955A also

incorporates peripheral circuits such as SysAD Bus Interface.

R4000 is a trademark of MIPS Technologies, Inc.

1.2

Notation used in this manual

1.2.1

Numerical notation

•

Hexadecimal numbers in this manual are expressed as follows:0x2A (example shown for

decimal number 42)

•

KB (kilobyte) 210 = 1,024 bytes

MB (megabyte) 220 = 1,024

× 1,024 = 1,048,576 byte

GB (gigabyte) 230 = 1,024

× 1,024 × 1,024 = 1,073,741,824 bytes

1.2.2

Data notation

•

Byte: Eight bits

•

Half word: Two contiguous bytes (16 bits)

•

Word: Four contiguous bytes (32 bits)

•

Double word: Eight contiguous bytes (64 bits)

1.2.3

Signal notation

•

Active-low signals are indicated by adding an asterisk(*) at the end of the signal name

(Example: RESET*)

•

When a signal is driven to the active voltage level, the signal is said to be “asserted.”

When the signal is driven to an inactive voltage level, it is said to be “deasserted.”

1.2.4

•

The following nomenclature is used for access attributes.

Read only. Cannot be written.

Write only. The bit value is undefined if read.

R/W:

R/W: Read/Write

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