5.16. No external coprocessors

If you are implementing a system that does not include any external coprocessors, you must tie both CHSD and CHSE to 10 (ABSENT). This indicates that no external coprocessors are present in the system. If any coprocessor instructions are received, they cause the processor to take the undefined instruction trap, allowing the coprocessor instructions to be emulated in software if required.

The coprocessor enable signal, CPEN, must be tied LOW to save power.

The coprocessor-specific outputs from the ARM7EJ-S processor must be left unconnected.

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