ARM R4F, r1p3 manual Product revision information, Processor identification

Introduction

1.11Product revision information

This manual is for major revision 1 of the processor. At the time of release, this includes the r1p0, r1p1, r1p2, and r1p3 releases, although the vast majority of the information in this document will also be applicable to any future r1px releases. The following broadly describes the changes made in each subsequent revision of the processor:

Revision 1 Introduction of the ECC functional options and addition of the FPU options, to implement the Cortex-R4F processor.

Note

The r1p0 release was not generally available.

1.11.1Processor identification

The Cortex-R4 processor contains a number of IDentification (ID) registers that enable software or a debugger to identify the processor as Cortex-R4, and the variant (major revision) and revision (minor revision) of the design. These registers are:

Main ID Register (MIDR)

This register is accessible by software and identifies the part, the variant, and the revision. See c0, Main ID Register on page 4-14.A copy of this register can also be read by a debugger through the debug APB interface. See Processor ID Registers on page 11-32.

Debug ID Register (DIDR)

This register can be read by a debugger through the debug APB interface, and by software. It identifies the variant and revision. See CP14 c0, Debug ID Register on page 11-10.

Peripheral ID Registers

These registers can be accessed through the debug APB interface only, and identify the revision number of the processor. See Debug Identification Registers on page 11-35.

Floating Point System ID Register (FPSID)

When the build-configuration includes the floating point unit, this register identifies the revision number of the floating-point unit. See Floating-Point System ID Register, FPSID on page 12-5.

Note

Floating point functionality is provided only with the Cortex-R4F processor.

The revision number of the processor, in the Peripheral ID and FPSID registers, is a single field that incorporates information about both major and minor revisions.

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