Cirrus-logic EP93xx Manuel d'utilisateur télécharger pdf (Page 71)

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DS785UM1 3-1

Chapter 3

3MaverickCrunch Co-Processor

3.1 Introduction

Note:This chapter applies only to the EP9302, EP9307, EP9312, and EP9315 processors.

The MaverickCrunch co-processor accelerates IEEE-754 floating point arithmetic and 32-bit

and 64-bit fixed point arithmetic operations. It provides an integer multiply-accumulate (MAC)

that is considerably faster than the native MAC implementation in the ARM920T. The

MaverickCrunch co-processor significantly accelerates the arithmetic processing required to

encode/decode digital audio formats.

The MaverickCrunch co-processor uses the standard ARM920T co-processor interface,

sharing its memory interface and instruction stream. All MaverickCrunch operations are

simply ARM920T co-processor instructions. The co-processor handles all internal inter-

instruction dependencies by using internal data forwarding and inserting wait states.

3.1.1 Features

Key features include:

• IEEE-754 single and double precision floating point

• 32/64-bit integer

• Add/multiply/compare

• Integer Multiply-Accumulate (MAC) 32-bit input with 72-bit accumulate

• Integer Shifts

• Floating point to/from integer conversion

• Sixteen 64-bit registers

• Four 72-bit accumulators

3.1.2 Operational Overview

The MaverickCrunch co-processor is a true ARM920T co-processor. It communicates with

the ARM920T via the co-processor bus and shares the instruction stream and memory

interface of the ARM920T. It runs at the ARM920T core clock frequency (either FCLK or

BCLK).

The co-processor supports four primary data formats:

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