Coprocessor Interface - ARM ARM1176JZF-S Technical Reference Manual

18.3

Coprocessor interface

ARM DDI 0301H
ID012310
The VFP11 coprocessor is integrated with an ARM11 processor through a dedicated VFP
coprocessor interface.
The VFP11 coprocessor uses coprocessor ID number 10 for single-precision instructions and
coprocessor ID number 11 for double-precision instructions. In some cases, such as
mixed-precision instructions, the coprocessor ID represents the destination precision. In a
system containing a VFP11 coprocessor, these coprocessor ID numbers must not be used by
another coprocessor.
Access to the VFP11 coprocessor is controlled by the ARM11 Coprocessor Access Control
Register. The coprocessor access rights must be configured correctly before any VFP11
instructions can be executed.
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Introduction to the VFP coprocessor
18-4